AAC device for speech: what it is, who needs one, and how to get started

An AAC (augmentative and alternative communication) device gives people who can't rely on speech a dependable way to get their message across, whether that's through pictures, symbols, text, or a recorded voice. The range is wide: you can start with a free paper communication board, or move up to a dedicated speech-generating device that runs $3,000 to $8,000 or more. In all 50 states, Medicaid covers dedicated AAC devices as long as a speech-language pathologist documents that the device is medically necessary.

What is AAC in speech therapy?

AAC stands for augmentative and alternative communication. The American Speech-Language-Hearing Association defines it as "all forms of communication (other than oral speech) that are used to express thoughts, needs, wants, and ideas" ^[1], which is a wider net than most parents expect. AAC isn't a last resort, and it isn't just for children who will never speak. It covers anything that supplements or stands in for speech, whether that's a single picture card taped to the fridge or a tablet running symbol software that talks out loud.

Speech-language pathologists bring AAC into therapy for two different reasons. Sometimes it's a bridge: a child is working toward spoken words but can't yet produce them reliably, so an AAC system keeps communication moving while speech catches up. Other times it's permanent. For some kids, a good AAC system simply is their voice, the same way a wheelchair is someone's legs. The question of whether AAC slows down speech has a clear answer: it doesn't. A 2006 meta-analysis in the American Journal of Speech-Language Pathology looked at 23 studies and found no evidence that AAC use suppresses speech development. For most participants, aided communication actually went hand in hand with gains in speech ^[2]. That finding has held up in later research too, and it's now ASHA's official position.

AAC shows up across a wide range of diagnoses, including autism spectrum disorder, childhood apraxia of speech, cerebral palsy, Down syndrome, acquired brain injury, and ALS. What matters isn't the diagnostic label but whether a child or adult can reliably meet their daily communication needs through speech alone. If they can't, AAC belongs in the conversation.

What are the main types of AAC devices?

AAC breaks down into unaided and aided systems. Unaided means there's no external tool involved, so sign language and gestures count as AAC on their own. Aided means the person uses something physical outside the body, and aided systems split further into low-tech and high-tech options.

Low-tech AAC covers paper communication boards, PECS (Picture Exchange Communication System) binders, printed choice boards, and alphabet boards. These cost almost nothing to make, they're nearly indestructible, and they keep working when batteries die. A lot of kids start here.

High-tech AAC is what most parents picture when they hear "AAC device": a speech-generating device (SGD) that plays synthesized or recorded voice when the user selects symbols, words, or letters. SGDs themselves split into two hardware categories. Dedicated devices are purpose-built, single-use computers, such as the Tobii Dynavox TD Snap, the PRC-Saltillo Accent series, or the Prentke Romich LAMP Words for Life devices. They're ruggedized, come with long warranties, and are what Medicaid and most private insurers typically cover. App-based systems run on commercial iPads or Android tablets instead, using apps like Proloquo2Go, TouchChat, LAMP Words for Life, or Snap Core First. The apps run $200 to $300, and the tablet costs extra on top of that. Insurance rarely covers commercial tablets as AAC hardware, though a handful of state Medicaid programs will.

How someone accesses the device matters just as much as which software it runs. Most users touch the screen directly, but children and adults with motor impairments may rely on a switch (single or dual), eye-gaze tracking, head tracking, or a joystick instead. Eye-gaze devices sit at the top of the price range, often $10,000 to $18,000, and they need their own separate evaluation before a family commits to one.

Here's how the main categories stack up against each other:

Category	Examples	Typical cost	Voice output	Insurance coverage
Low-tech boards	PECS, choice boards	$0, $50	No	N/A
App on commercial tablet	Proloquo2Go on iPad	$200, $500 (app + tablet)	Yes	Rarely
Dedicated SGD (touch)	Tobii Dynavox TD Snap	$3,000, $8,000	Yes	Often (Medicaid, some private)
Eye-gaze SGD	Tobii I-Series, DynaVox Eye Max	$10,000, $18,000	Yes	Often with strong documentation

How does an AAC device actually generate speech?

Speech-generating devices talk in one of two ways: digitized speech, which is recorded clips of a real human voice, or synthesized speech, which uses text-to-speech (TTS) engines.

Digitized speech sounds warm and natural because someone actually recorded it. The catch is that a person can only say what was recorded ahead of time, so it works well for a set of core phrases but can't handle a sentence nobody thought to record.

Synthesized speech uses TTS to turn any typed or symbol-selected text into spoken words, and it can say anything. Modern TTS voices, including Acapela, VocaliD, and newer neural-network voices, sound much more natural than the robotic tone people remember from the 1990s. Some companies now let a user bank a personalized voice by recording samples of their own speech before they lose it, which matters a great deal for adults with ALS or other progressive conditions. Most AAC software on the market today blends both approaches: recorded clips handle quick social messages like "Hi, how are you?" and TTS covers everything else.

The symbol sets built into the software vary too. SymbolStix and PCS (Picture Communication Symbols) show up most often. Some systems use a core vocabulary model, giving prime screen space to a small set of high-frequency words (go, want, more, stop, that, it), since those words make up roughly 80 percent of everyday communication ^[3]. Other systems organize vocabulary by category or topic instead. A good SLP looks at a child's cognitive and motor profile before deciding which layout actually fits.

Who is a candidate for an AAC speech device?

Anyone whose speech doesn't reliably meet their communication needs can be a candidate. There's no minimum age: research has documented successful AAC use in children as young as 18 months ^[4]. There's no cognitive prerequisite either. The old idea that a child needed some "cognitive readiness level" before qualifying for AAC isn't supported by current evidence, and ASHA has formally rejected it ^[1].

People who benefit from AAC include autistic children and adults who are minimally verbal or nonspeaking, children with childhood apraxia of speech (where motor planning makes consistent speech output impossible even when a child understands language just fine), and people with apraxia of speech caused by acquired brain injury or stroke. The list also includes children and adults with cerebral palsy that affects the speech muscles, people with Down syndrome who struggle with speech intelligibility, and adults with ALS, Parkinson's, or other progressive neurological conditions.

AAC comes up constantly in conversations about autism spectrum speech therapy, and for good reason. The CDC estimates that roughly 25 to 30 percent of autistic individuals are minimally verbal, meaning they produce fewer than 30 functional spoken words ^[5]. For that group, waiting for speech to show up without offering any other way to communicate can mean years of unmet needs, and there are documented effects on behavior and quality of life that follow from that wait.

For late talkers without a clear diagnosis, the decision is trickier. Many late talkers catch up over time with targeted speech therapy. But if a child is communicating mainly through crying, tantrums, or acting out physically because they don't have a reliable way to get their message across, adding low-tech AAC alongside ongoing speech therapy is a reasonable step. It doesn't shut the door on spoken language developing later.

How does AAC device evaluation work?

Getting the right device takes time. The process starts with a formal AAC evaluation done by an SLP who has specialized training in AAC. Some SLPs hold the ATP (Assistive Technology Professional) credential from RESNA, though you don't need that credential to conduct an AAC evaluation.

The evaluation looks at how the person communicates now, and through what means, and how reliably. It looks at language skills too: receptive and expressive vocabulary, and literacy level. Motor abilities matter a lot, since they determine access, whether that's fine motor control for touching a screen, gross motor for switch use, or eye movement for a gaze system. Vision and hearing get checked as well, since sensory status shapes display layout and how much auditory feedback someone needs. Then there's attention, learning style, and motivation to weigh, along with the practical question of environment: will the device be used at school, at home, out in the community, and who else, teachers, family members, needs to learn it alongside the child? Once the SLP has gathered all that, they run a device trial: the child actually uses candidate devices over several sessions before anyone makes a recommendation. Insurers often require proof that this trial period happened before they'll authorize funding.

The evaluation report itself is what makes or breaks insurance funding. It has to establish medical necessity, show that speech alone isn't enough for functional communication, and explain why the specific device being recommended is the right fit. Vague reports get denied. The more specific the functional communication data in the report, the better the odds of coverage.

Families just starting out should know that early intervention services, available for children under 3 in the U.S., can include an AAC evaluation at no cost. Once a child turns 3, the school district's IEP process can fund both the evaluation and the device itself for educational use, though a device provided by the school may not be allowed to go home with the child.

How much does an AAC speech device cost?

The price depends heavily on what kind of device you're looking at and how it's controlled.

Apps like Proloquo2Go (by AssistiveWare) and TouchChat run $200 to $300, but you also need an iPad to run them, which adds another $300 to $500 for a refurbished or entry-level model. So the real total is usually $500 to $800, which is why a lot of families start here.

Dedicated speech-generating devices from the major manufacturers (Tobii Dynavox, PRC-Saltillo, Lingraphica) typically cost $3,000 to $8,000 for touch-access models. Eye-gaze systems, which are more complex, can run $10,000 to $18,000 or more.

Those numbers are list prices, though, and most families never actually pay them.

Medicaid (including CHIP) covers speech-generating devices as durable medical equipment in all 50 states once medical necessity is documented ^[6]. That coverage applies to dedicated devices, not commercial tablets, and reimbursement rates plus prior authorization rules differ from state to state.

Private insurance is less predictable. Many private insurers follow Medicare's policy on speech-generating devices, which has covered them since 2001 under HCPCS codes E2500 to E2510 ^[7], according to the AAC funding community. Denials still happen, though, and appeals are often part of the process. Having an SLP who knows AAC funding can make the difference between getting approved and getting turned down.

Most AAC manufacturers employ funding specialists who will help families navigate insurance at no charge, so it's worth using them rather than figuring it out alone.

If you can't wait on insurance, device lending libraries run through state assistive technology programs (funded under the Assistive Technology Act of 2004, 29 U.S.C. § 3001) ^[8] let families try a device before committing to a purchase, and sometimes cover the gap while an insurance claim works its way through. You can find your state's program through the AT3 Center.

Does AAC really work?

Yes, and the evidence behind it is substantial. AAC outcome research has grown a lot since 2000. A 2012 systematic review in the Journal of Autism and Developmental Disorders found that SGDs produced functional communication gains in minimally verbal autistic individuals across multiple study designs ^[9]. ASHA's Evidence Maps for AAC rate the evidence for SGDs with autistic populations as "strong" for outcomes including vocabulary acquisition, spontaneous communication, and social interaction.

For children with childhood apraxia of speech, AAC used alongside speech therapy (not instead of it) is endorsed by Apraxia Kids and backed by case series and clinical reports, though large randomized controlled trials in this group are still limited.

One finding matters a lot if you're worried a device will hold your child back. A 2014 study by Kasari et al., published in the Journal of Child Psychology and Psychiatry, found that minimally verbal autistic children aged 5 to 8 who received an SGD-based intervention showed significant gains in spoken words and spontaneous communication compared to controls ^[10]. The device didn't replace speech development. In many cases it seemed to support it.

Nobody has clean data on which specific device or software produces the best outcomes, because head-to-head trials across commercial systems are rare and mostly industry-funded. The honest summary is that device type matters less than how well it's actually used. A high-end SGD sitting unused in a bag beats nothing, but it loses to a simple paper board that the adults around a child model consistently.

That modeling, sometimes called aided language stimulation or aided input, is when adults point to or activate AAC symbols during natural conversation, more often than they ask the child to use the device themselves. The research on modeling is consistently positive: children pick up vocabulary faster and start using their devices more spontaneously when the adults around them model it regularly.

What is AAC device speech therapy like at home?

An SLP handles the evaluation and initial programming, but the bulk of learning happens at home and at school. This is where most progress stalls, and it's also where parents have more power than they realize.

The most evidence-backed home strategy is modeling. Every time you make a comment, answer a question, or narrate what's happening, also touch the matching symbol on the AAC device. You're showing the child how the tool works, the same way babies learn spoken language by hearing it long before they produce it. A child isn't expected to model back right away, and that's normal.

A few things the research and clinical literature back up: skip asking "what do you want to say on your device?" before handing it over, just keep it available and use it yourself during everyday activities. Expand on what the child communicates rather than correcting it: if they press "more," you say "More! More crackers. Want more?" while showing "more crackers" on the device. Expect a silent period too, since some children watch for weeks before producing anything themselves, which doesn't mean the system is failing. And keep the device charged and within reach. One stuck in a backpack or left at school teaches a child that communication is a therapy thing, not a life thing.

For children with autism who produce echolalia, AAC can work alongside that speech rather than against it. The goal is never to erase a communicative behavior, it's to widen the child's repertoire.

Apps and AI-assisted tools can supplement what you're doing at home. Little Words, for example, is an AI speech companion app built for neurodivergent kids that parents can use alongside a formal AAC system to build language into daily routines. It won't replace SLP-led therapy or a formal SGD evaluation, but it can add steady language exposure between sessions. If you're not sure whether it fits your child, the start quiz can help point you toward the right approach.

Families who can't get to an SLP regularly now have more options too: online speech therapy has expanded access quite a bit, and telepractice delivery of AAC services has research support from ASHA ^[1].

How do you get an AAC device covered by insurance or Medicaid?

Getting a device funded is a process with a specific order to it, and skipping a step is usually what causes delays.

Start with a formal AAC evaluation from a qualified SLP. It needs to document the child's current communication status, functional limitations, and why this particular device is medically necessary. No payer will approve coverage without that document in hand.

Next comes a prescription from a physician or other licensed prescriber. Most insurers want a medical order to go along with the SLP's report, so it helps to make sure the physician's notes match up with the medical necessity language the SLP already wrote.

From there, someone submits a prior authorization request to the insurer or Medicaid. That packet should include the SLP's evaluation, the physician's prescription, a quote from the device supplier, and whatever forms the payer requires. Medicaid uses HCPCS codes E2500 through E2510 for SGDs^[7].

Then you wait, and follow up. Prior authorization can take anywhere from 2 weeks to 3 months. If the request gets denied, appeal right away. Most first-line denials come down to missing paperwork rather than any clinical disagreement, and appeals succeed at a meaningful rate when the SLP's documentation is solid to begin with.

Finally, you'll work with a supplier. DME (durable medical equipment) companies that specialize in AAC handle the billing and ship the device once everything clears. Your SLP should already have relationships with suppliers, and the funding teams at major manufacturers can also help connect you.

For kids receiving special education services under IDEA, the school district may have to provide an AAC device as part of a free appropriate public education, as long as it's written into the IEP as a necessary support^[12]. That said, school-funded devices are typically meant for school use only, which is why many families pursue school funding alongside private insurance or Medicaid to get a second device the child can keep at home.

What's the difference between AAC and a communication app on a regular tablet?

This mix-up trips up a lot of families, and it's not just semantics, it changes what you'll end up paying.

A dedicated AAC device counts as durable medical equipment. It runs software built for one purpose, has a case designed to take a beating, and comes with a long warranty (often 3 to 5 years). Tobii Dynavox, PRC-Saltillo, and Lingraphica make the main ones, and these are the devices Medicaid actually covers.

A communication app on a commercial iPad is different: it's software sitting on hardware that was built to do a hundred other things too. Proloquo2Go, TouchChat, LAMP Words for Life, and Snap Core First all fall into this category, and they work just as well clinically as dedicated devices. The catch is funding. Medicaid and most private insurers won't pay for an iPad as medical equipment, since the same tablet can stream cartoons or run games just as easily as it runs a communication app. A few states carve out exceptions to this. California's Medi-Cal, for instance, has at times covered app-based systems under certain conditions, so it's worth checking your own state's Medicaid policy rather than assuming either way. If you can pay out of pocket, going the app route is often the quickest path to getting a voice in your child's hands, sometimes in a matter of days. If you need public funding to cover the cost, the dedicated device path takes longer to set up but typically results in full or near-full coverage, with nothing owed for the hardware itself. For a closer look at how the various AAC devices stack up against each other, brand by brand, that's a good next stop if you want to dig into the hardware side more.

Going into an AAC evaluation without a list of questions means leaving a lot on the table. Here's what's actually worth asking.

Start with the vocabulary system: what will they consider, and why? Core vocabulary, fringe vocabulary, and hybrid approaches suit different learners, so ask for the reasoning behind whatever they recommend. Then ask about access. Touch gets assumed by default, but it isn't always the right fit, and if your child has motor challenges, you'll want to ask about switch scanning or eye gaze before you leave the room.

It's also worth asking whether you can trial the device at home before committing to anything. Many SLPs and suppliers can arrange a 30-day trial, and device lending libraries through state AT programs are another route in if that's not available.

Training matters more than people expect. A device with no parent or caregiver training behind it is a device that ends up in a drawer, so ask exactly how many training hours come with it and whether school staff get trained too. While you're at it, find out who handles funding and prior authorization: some SLP practices manage this in-house, others leave the paperwork to the family, and you want to know which before you walk out.

Finally, ask how progress will actually be measured. Spontaneous communication frequency, vocabulary breadth, and communicative functions like requesting, commenting, refusing, and greeting can all be tracked, and a real plan for measuring outcomes keeps therapy honest.

One more thing to raise: how involved will the SLP stay after this first visit? AAC isn't a one-time prescription. Vocabulary needs ongoing programming, layouts need updating as a child grows, and therapy goals shift over time. An SLP who hands over a device and disappears isn't giving adequate support, and ASHA's practice guidelines actually call for ongoing collaborative support across settings ^[1].

If the clinician you're seeing seems shaky on any of this, it's reasonable to look for someone with deeper AAC specialization. ASHA's ProFind directory lets you filter by specialty, and USSAAC (the United States Society for Augmentative and Alternative Communication) keeps its own provider directory too ^[11].

What are the most popular AAC apps and devices right now?

A handful of options dominate the AAC world, and each does something different well.

Proloquo2Go, made by AssistiveWare, is probably the most widely used AAC app out there. It runs on iPad, uses SymbolStix symbols, and offers a core vocabulary layout, with solid research behind it. It costs around $250, and since it requires an iPad, AssistiveWare sells ruggedized cases to go with it.

LAMP Words for Life, from PRC-Saltillo, is built around the Language Acquisition through Motor Planning approach. It was designed for children with motor-based speech difficulties, including childhood apraxia of speech, and it's available both as a standalone app and on dedicated PRC-Saltillo hardware. Because every word always sits in the same place and gets reached through the same motor pattern, many SLPs who work with motor-impaired kids find it a natural fit.

Snap Core First, made by Tobii Dynavox, runs on iPad or on Tobii's own hardware. It works well for children who are moving from symbol-based communication toward reading and writing.

TouchChat, from Saltillo, is another app with several vocabulary sets built in, including WordPower, which has strong clinical backing for users with good literacy skills.

When it comes to dedicated hardware, Tobii Dynavox and PRC-Saltillo lead the U.S. market, and Tobii Dynavox is also the main maker of eye-gaze systems.

No single option here beats the rest across the board. What works depends on how your child accesses the device, which vocabulary approach fits them, their cognitive profile, and, just as much, what your child's SLP already knows how to program and support. A device that got rave reviews in a Reddit thread but that your SLP has never set up before is worth less than one that's slightly less ideal but familiar to the person actually helping your child use it.

Frequently asked questions

What is AAC in speech therapy?

AAC (augmentative and alternative communication) covers every way of communicating that isn't oral speech, from picture boards to high-tech speech-generating devices. In therapy, it gives a person who can't rely on speech a reliable way to get their message across, sometimes as a bridge while speech develops, sometimes as a permanent primary system. ASHA treats AAC as a core part of what speech-language pathologists do.

At what age can a child start using an AAC device?

There's no minimum age. Researchers have documented successful AAC use in children as young as 18 months, and ASHA is clear that a child doesn't need to hit any cognitive or developmental milestone before starting. Starting earlier tends to lead to better outcomes, so if your child isn't meeting communication milestones, it's worth asking an SLP about AAC at the same time you look into speech therapy, not after.

Will using an AAC device stop my child from learning to talk?

No. Several systematic reviews, including a 2006 meta-analysis in the American Journal of Speech-Language Pathology that looked at 23 studies, found no evidence that AAC suppresses speech development. In most of the studies reviewed, AAC use went hand in hand with gains in speech. ASHA's official stance is that AAC supports spoken language rather than getting in its way.

How much does an AAC speech device cost?

AAC apps for iPad run $200 to $300, plus another $300 to $500 for the tablet itself. Dedicated speech-generating devices cost $3,000 to $8,000 for touch-access models, and eye-gaze systems climb to $10,000 to $18,000. Most families never pay these prices out of pocket: Medicaid covers dedicated devices for medically documented need in all 50 states, and Medicare has covered them since 2001.

Does insurance or Medicaid cover AAC devices?

Medicaid covers dedicated speech-generating devices as durable medical equipment in all 50 states once an SLP documents medical necessity. Private insurance varies but often mirrors Medicare's policy, which has covered these devices under HCPCS codes E2500 to E2510 since 2001. Commercial tablets running AAC apps generally aren't covered on their own. Denials do happen, but appeals backed by solid SLP documentation often go through.

What is the difference between a dedicated AAC device and an iPad app?

Dedicated devices, like those from Tobii Dynavox or PRC-Saltillo, are purpose-built, ruggedized, and covered by Medicaid. AAC apps such as Proloquo2Go or TouchChat run on ordinary iPads, cost $500 to $800 total, and get into a child's hands faster, but insurance rarely pays for the hardware. Both are clinically valid choices. It often comes down to how quickly you need something and whether your child needs a rugged, single-purpose device.

What is LAMP Words for Life and who is it for?

LAMP (Language Acquisition through Motor Planning) Words for Life is an AAC app and device system from PRC-Saltillo built around consistent motor patterns: every word always sits in the same spot on the screen. It was designed for people with motor-based communication difficulties, including childhood apraxia of speech, and SLPs who work with motor-impaired populations tend to favor it. It runs on iPad and on dedicated PRC-Saltillo hardware.

How do I get an AAC evaluation for my child?

Start by asking your pediatrician for a referral or contacting an SLP directly. If your child is under 3, your state's early intervention program is required to evaluate at no cost. For school-age children, put the request in writing to your school district's special education office: under IDEA, the district has to evaluate. ASHA's ProFind directory at asha.org lets you filter for AAC specialists.

Can a child use AAC alongside speech therapy, or is it one or the other?

Almost always both. AAC isn't a substitute for speech therapy, it's a tool used within it. SLPs bring AAC devices into sessions and train parents to use them at home, aiming for growth in spoken communication and AAC fluency at the same time. The two approaches reinforce each other, and ASHA's clinical guidelines call for integrated intervention rather than treating them as separate tracks.

What is aided language stimulation and why does it matter?

Aided language stimulation, also called aided input or modeling, is when parents, teachers, and therapists point to or activate AAC symbols during ordinary conversation, more often than they prompt the child to use them. It's the home strategy with the most consistent research support in this field. Kids whose caregivers model regularly pick up vocabulary faster and start using their devices on their own more than kids who only get direct prompts.

What AAC devices are best for autistic children?

There's no single best device for autism: the right fit depends on the child's motor skills, cognitive profile, and vocabulary needs. That said, speech-generating devices have strong research backing for minimally verbal autistic children. A 2014 study by Kasari and colleagues found SGD-based intervention led to significant gains in spoken words and spontaneous communication. Getting a qualified SLP evaluation is really the only reliable way to match a device to a specific child.

Can AAC be used for childhood apraxia of speech?

Yes. AAC is often recommended for children with apraxia whose speech isn't yet reliable enough for everyday communication. LAMP Words for Life was designed with motor-planning principles that suit apraxia specifically, and Apraxia Kids supports using AAC alongside targeted speech therapy. It doesn't replace apraxia-specific treatment; it runs alongside it so the child has a way to communicate while the speech work continues.

How long does the AAC device funding process take?

Realistically, 2 to 6 months from evaluation to having a device in hand, sometimes longer. The evaluation itself takes one to several sessions, writing the report takes 1 to 2 weeks, and prior authorization can take anywhere from 2 weeks to 3 months depending on the payer. Families who borrow from a device lending library through their state's assistive technology program can use a device while they wait, which also satisfies many insurers' trial-period requirements.

What happens at school if my child uses an AAC device?

If AAC is written into your child's IEP as necessary for their education, the school district has to provide the device at no cost and train staff to support it. School-funded devices, though, typically stay at school, so many families pursue a second device through Medicaid or private insurance for home use. The IEP team should include specific AAC goals and spell out who's responsible for programming updates.

Sources American Speech-Language-Hearing Association's Augmentative and Alternative Communication portal defines AAC as any form of communication other than oral speech, states there's no cognitive prerequisite for using it, and endorses delivering AAC support through telepractice. A meta-analysis of 23 studies, Millar, Light & Schlosser (2006), American Journal of Speech-Language Pathology, 'The Impact of AAC on the Speech Production of Individuals with Developmental Disabilities', found no evidence that AAC suppresses speech; most participants actually gained spoken language while using it. Marvin, Beukelman & Bilyeu (1994), Augmentative and Alternative Communication, core vocabulary frequency data shows that a small set of high-frequency core words covers roughly 80 percent of everyday communication. According to Romski & Sevcik (2005), Infants and Young Children, AAC and young children, children as young as 18 months have used AAC successfully, and there's no minimum age required to introduce it. The CDC's Data and Statistics on Autism Spectrum Disorder reports that about 25 to 30 percent of autistic individuals are minimally verbal, meaning they produce fewer than 30 functional spoken words. On the funding side, Centers for Medicare and Medicaid Services, Medicaid Benefits confirms Medicaid covers speech-generating devices as durable medical equipment in all 50 states once medical necessity is documented, and the CMS Medicare Coverage Database entry on SGD coverage under HCPCS E2500-E2510 notes Medicare has covered these devices since 2001 under that code range, a policy many private insurers also follow. Families who want to try equipment before committing can look to the Assistive Technology Act of 2004, 29 U.S.C. § 3001, Association of Assistive Technology Act Programs state directory, which funds state programs running device lending libraries. On outcomes, Ganz et al. (2012), Journal of Autism and Developmental Disorders, SGD systematic review found that speech-generating devices produced real functional communication gains for minimally verbal autistic individuals across a range of study designs. In a more targeted trial, Kasari et al. (2014), Journal of Child Psychology and Psychiatry, 'Communication Interventions for Minimally Verbal Children with Autism', minimally verbal children aged 5 to 8 who got SGD-based intervention showed significant gains in spoken words and spontaneous communication compared to those who didn't. Families looking for help can search the ASHA ProFind SLP directory, which lets you filter by AAC specialization, and should know that under the Individuals with Disabilities Education Act (IDEA), U.S. Department of Education, school districts are required to provide AAC devices as part of a free appropriate public education once they're documented in a child's IEP.