Communication & AAC

Communication differences in autism

Autism affects communication in many different ways. Some autistic people are highly verbal but struggle with pragmatic language — the social rules of conversation like turn-taking, reading intent, and interpreting figurative language. Others have limited spoken language or no spoken language at all.

The term "nonverbal" is often misused: many children diagnosed as nonverbal at age 3 or 4 develop functional speech with appropriate support. A more accurate framing is "minimally speaking" or "non-speaking at this time." Access to AAC supports communication regardless of whether spoken speech develops later.

Communication also encompasses more than talking: receptive language (understanding), expressive language (producing), pragmatic language (social use), and alternative modalities (writing, AAC, gesture). An SLP evaluation should assess all of these, not just spoken word count.

What AAC is

AAC (augmentative and alternative communication) refers to all tools and strategies that supplement or replace spoken speech. There are several categories:

• Low-tech: picture exchange communication systems (PECS), symbol boards, communication books. No batteries, durable, inexpensive.
• Mid-tech: simple speech-generating devices with pre-recorded messages (GoTalk, BIGmack).
• High-tech: dedicated speech-generating devices (SGDs) like PRC-Saltillo's Accent or Tobii Dynavox; iPad apps like Proloquo2Go, TouchChat, or LAMP Words for Life.

The myth that AAC reduces speech: this is one of the most common concerns parents have — and it is not supported by research. Studies consistently show that AAC access increases overall communication, including spoken speech, by reducing frustration and providing a model for language structure. The American Speech-Language-Hearing Association's position is clear: AAC should not be withheld based on concern that it will replace speech.

Getting AAC for your child

The starting point is an SLP evaluation focused specifically on communication needs and AAC. This is different from a general speech therapy evaluation — be explicit when requesting it.

Through school (IDEA): AAC is a related service under IDEA. If your child's communication needs affect their education, the IEP team is required to consider AAC as part of the evaluation and plan. Request this in writing. The school must provide what is educationally necessary — not necessarily the most expensive device, but not an inadequate one either.

Through insurance: speech-generating devices are often covered as durable medical equipment (DME). The process: SLP writes a letter of medical necessity, the device is prescribed, and your insurer reviews. Prior authorization is common. Denials happen — appeal using the same process as ABA denials (see insurance & prior authorization).

Trial periods: most AAC systems offer loaner devices or trial periods. An SLP can arrange a trial with a specific system before requesting insurance coverage or an IEP device. Don't commit to a specific system before trialing it with your child.

Supporting communication at home

Aided language input: the most research-supported strategy for AAC learners. You use the AAC device or board to model language yourself — not just prompting your child to use it. When you say "let's eat," also press the "eat" symbol. This gives your child a model for how the system works and shows that the device is for everyone, not just them.

Consistency: AAC works best when used consistently across settings — home, school, therapy, and community. Bring the device everywhere. Work with the school and therapist to keep vocabulary consistent. Vocabulary that exists at school but not at home (or vice versa) slows learning.

Core vocabulary: high-tech AAC systems use a core vocabulary (the most frequently used words: more, stop, help, want, go, I, you, like, not, that) plus fringe vocabulary (specific nouns). Core words are used across many situations. Prioritize learning core words first — they are more generalizable than nouns.

Involving the whole family: children learn language through social interaction, not just therapy sessions. The more people who model and respond to AAC use at home, the faster learning happens. Show siblings and grandparents how to use the system.

Pragmatic language and social communication

Pragmatic language is the social use of language — knowing when to speak, how to take turns, how to stay on topic, and how to interpret what someone really means versus what they literally said. It is distinct from vocabulary and grammar. A child can have an impressive vocabulary and correct sentence structure while still struggling significantly with conversation.

This matters because highly verbal autistic people are often assumed to have no communication needs. They speak fluently, so supports are rarely offered. But they may miss sarcasm, struggle to read when another person wants to end a conversation, repeat the same topic regardless of the listener's interest, or take idioms at face value. These are pragmatic differences — and they are real, even when a child "sounds fine."

Frameworks like Social Thinking (Michelle Garcia Winner) attempt to teach neurotypical conversational rules explicitly — things like body language, reading the "social situation," and adjusting behavior based on others' comfort. These frameworks are widely used in school settings, and some families find them useful for helping a child navigate specific environments.

However, they carry a significant critique from many autistic self-advocates: they frame autistic communication styles as deficits to be corrected rather than differences to be accommodated. Research on what autistic people call the double empathy problem suggests that communication breakdowns between autistic and non-autistic people are bidirectional — each group has difficulty reading the other. Teaching autistic children to mask autistic communication patterns carries psychological costs. Hold both realities: your child may benefit from learning specific social scripts for specific contexts, and it is also valid to accommodate their natural communication style rather than eliminate it.

What schools can provide:

• Social narratives (sometimes called Social Stories) — brief, descriptive stories that walk through a social situation step by step, written from your child's perspective. Useful for specific, recurring situations like lunch, recess, or transition times.
• Visual supports — conversation cards, topic menus, or "my turn / your turn" visual cues that make conversational structure explicit.
• Peer mentoring and structured social opportunities — not forced unstructured "play time," which is often overwhelming, but adult-facilitated activity with clear purpose and roles (a board game, a shared project).
• Speech-language services targeting pragmatics specifically — request this explicitly in the IEP if your child's goals are currently focused only on articulation or vocabulary.

What you can do at home:

• Narrate social situations after they happen, not during — "I noticed that person looked away when you kept talking about trains. What do you think that meant?" Give your child space to reflect without feeling corrected in the moment.
• Don't correct mid-conversation. Interrupting a child to say "that's not how you talk to people" shuts down communication and increases anxiety without building skill.
• Choose genuinely interested conversation partners. Peers who share your child's interests are the most natural contexts for successful social communication — find those situations, not forced interactions with randomly grouped children.
• Accept that some pragmatic differences are not problems to fix. Many autistic people prefer directness, dislike small talk, and communicate better in writing. These are not deficits.

Fighting insurance denials for AAC devices

Insurance denials for speech-generating devices (SGDs) are extremely common. Insurers frequently claim the device is "not medically necessary" or that the child "can already communicate" — pointing to any functional speech, no matter how limited, as evidence that an SGD is not needed. This logic is flawed and legally contestable.

The core argument insurers make — that a child who produces some spoken words does not need an SGD — is contradicted by the research evidence and by clinical best practice. AAC and spoken speech are not mutually exclusive. The American Speech-Language-Hearing Association and the research literature consistently show that AAC does not replace speech development; it supports it. A child who can say 20 words under ideal conditions may be completely unable to communicate in a noisy classroom, when anxious, or during a medical situation. The SGD addresses those gaps.

The appeals process, step by step:

• Step 1 — Internal appeal: every insurer is required by federal law (the ACA) to offer at least one level of internal appeal. File immediately — deadlines are typically 180 days from the denial. Request a copy of the full denial letter and the insurer's clinical coverage criteria for SGDs.
• Step 2 — External review: if the internal appeal is denied, request an independent external review. An external reviewer (not employed by your insurer) evaluates the denial. External review decisions are binding on the insurer in most states.
• Step 3 — State insurance commissioner complaint: if external review fails, file a complaint with your state's insurance commissioner. This is also a useful parallel track — complaints create a regulatory record and sometimes trigger faster resolution.

What makes a strong Letter of Medical Necessity (LMN):

• A detailed functional communication baseline — specifically what the child cannot communicate today, in which situations, and with what functional impact (on safety, health care, education, community participation).
• A clear statement of what the device enables that current communication cannot — not just "it will help," but specific functional goals.
• The SLP's credentials, evaluation summary, and recommendation, including why the specific device requested is appropriate over alternatives.
• Peer-reviewed citations — studies showing AAC increases overall communication and does not suppress speech. Your SLP may be able to pull these; the ASHA evidence maps are a starting point.
• If the child is school-age, IEP records documenting communication goals and the school's assessment of communication needs provide powerful corroborating evidence.

Phrases that work in appeal letters:

• "The denial states that [child's name] 'can communicate.' However, the clinical standard is not whether a child produces some speech, but whether their current communication is functionally adequate across environments. The attached SLP evaluation documents that it is not."
• "ASHA's position statement and peer-reviewed research (citations attached) confirm that AAC and spoken speech are not mutually exclusive. Withholding an SGD on the basis that it will suppress speech is not consistent with the clinical evidence."
• "We are requesting that the external reviewer apply the standard of care as established by ASHA and the broader SLP clinical community, not solely the insurer's internal coverage criteria."

When your SLP won't write the LMN: some SLPs are reluctant to engage with insurance paperwork or are unfamiliar with the appeals process. If your current SLP declines or writes an inadequate LMN, you have options: request a comprehensive AAC evaluation from a university speech-language clinic (many do insurance-ready evaluations), or ask a different SLP — one who specializes in AAC and insurance advocacy — to conduct a second evaluation.

Medicaid is different: if your child has Medicaid (or Medicaid as secondary insurance), the rules are more favorable. Under the EPSDT mandate (Early and Periodic Screening, Diagnostic, and Treatment), Medicaid is required to cover any medically necessary service for children under 21 — even if it is not a covered service for adults. Many states do not require prior authorization for SGDs through Medicaid, and denials are less common. Contact your state's Medicaid agency directly or work with a Medicaid-specialist SLP.