Speech Impediment: Types, Signs, and When to Get Help

✓ Reviewed against MedlinePlus (NLM), NIDCD, ASHA Practice Portal, ASHA ICD-10-CM listEvidence level ALast reviewed October 30, 2026Published October 14, 2026

“Speech impediment” is an everyday phrase, not a diagnosis. Clinicians call it a speech disorder: trouble making speech sounds (articulation or phonology), stuttering, or voice and resonance problems. Children may outgrow milder ones; errors that persist, or make a child hard to understand, are worth an evaluation.

What “speech impediment” means

Do I have a speech impediment? — a 5-minute self-check for adults and teens

MedlinePlus defines a speech disorder as a condition in which a person has problems creating or forming the speech sounds needed to communicate with others, which can make speech difficult to understand. “Speech impediment” is the everyday name for the same thing.¹

It is not the same as a language disorder. NIDCD separates the two: children who have trouble producing speech sounds correctly, or who hesitate or stutter, may have a speech disorder; children who have trouble understanding what others say or sharing their thoughts may have a language disorder.²

Types of speech impediments

Common speech disorders in children (MedlinePlus, NIDCD).
Type	What you might hear
Articulation disorder	Specific sounds distorted or swapped — “coo” for “school,” or an S made with a whistle
Phonological disorder	Patterns of sounds left out or changed — “boo” for “book,” “pi” for “pig” — while the same sound is fine in other words
Lisp	A distorted S or Z — for example, a lateral S, with air escaping over the sides of the tongue
Disfluency (stuttering)	Repeated sounds or words, stretched sounds (“Boooobby”), or stuck pauses
Voice or resonance disorder	Hoarseness, a voice that breaks, or speech that sounds too nasal or not nasal enough
Apraxia of speech	Difficulty putting sounds and syllables together in the correct order

Common speech disorders in children (MedlinePlus, NIDCD).^1,2,3

In medical coding, most speech sound problems in children fall under ICD-10-CM F80.0, Phonological disorder, whose inclusion terms are dyslalia, functional speech articulation disorder, lalling, lisping, phonological developmental disorder, speech articulation developmental disorder, and speech-sound disorder.⁴

How common they are

Speech sound disorders are common in young children. ASHA’s Practice Portal reports estimates of 2.1% to 23% among 4- to 6-year-olds, 3.6% with persistent speech sound disorder at age 8, and 1% to 2% of young adults with residual or persistent speech errors.^3,6

2.1%–23%of 4- to 6-year-olds estimated to have a speech sound disorder (ASHA Practice Portal).³

Age matters when judging any error. In US norms, sounds such as S, Z, L, SH, and CH are acquired by 4;0–4;11 at the 90% criterion, R by 5;0–5;11, and voiceless TH by 6;0–6;11 — so a 4-year-old saying “wabbit” is usually on schedule.⁵

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Is there a speech impediment test?

There is no single online test that diagnoses a speech disorder. MedlinePlus describes a health care provider asking about developmental and family history, and lists tools a speech professional may use, such as the Goldman-Fristoe Test of Articulation 3 and the Arizona Articulation and Phonology Scale; a hearing test may be done to rule out hearing loss.¹

A full speech sound assessment, as ASHA describes it, adds a case history, an oral mechanism exam, a hearing screening, single-word and conversation samples, and stimulability testing. Free online screeners can tell you whether an evaluation is worth booking; they cannot replace one.³

When to get help

Errors on sounds most children have mastered for their age.
Speech that strangers find hard to understand.
A wet or slushy S at any age.
Stuttering with tension, or your child avoiding speaking.
Your child is frustrated, teased, or self-conscious about speech.

Find a certified speech-language pathologist through ASHA’s ProFind directory, or ask your pediatrician or school.⁷

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About SpeechStep

SpeechStep is home speech practice for ages 4–8. It gives an instant AI check for R and listen-and-compare practice for other sounds. It does not diagnose a speech impediment.

Frequently asked questions

What is a speech impediment?＋

It is a common name for a speech disorder. MedlinePlus defines a speech disorder as a condition in which a person has problems creating or forming the speech sounds needed to communicate, which can make speech hard to understand. It is different from a language disorder, which affects understanding or expressing meaning.

What are the types of speech impediments?＋

MedlinePlus lists articulation disorders, phonological disorders, disfluency (such as stuttering), and voice or resonance disorders as common speech disorders. NIDCD adds apraxia of speech, which makes it hard to put sounds and syllables together in the right order.

Is a lisp a speech impediment?＋

Yes. In the ICD-10-CM diagnosis codes, “lisping” is listed under F80.0, Phonological disorder, alongside “speech-sound disorder” and “functional speech articulation disorder.”

Can a child outgrow a speech impediment?＋

Sometimes. MedlinePlus notes children may outgrow milder forms, and that speech therapy may help with more severe symptoms or problems that do not improve. Many errors are simply on schedule — R is not acquired until 5;0–5;11 in US norms — so age matters.