Is Q18.3 a billable ICD-10-CM code?

Yes. Q18.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Q18.3 sit in the tabular list?

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of eye, ear, face and neck (Q10-Q18).

What cannot be coded together with Q18.3?

Q18.3 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Q18.3 (Q18) and apply to it just the same.

Q18.3

Q18.3 — Webbing of neck

Billable / specific codeICD-10-CMPOA exempt

Q18.3 is a billable, specific ICD-10-CM code for webbing of neck. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Pterygium colli

Excludes1 inherited from the categories above Q18.3

These are not written on Q18.3, but they bind it: a note on a category applies to every code beneath it. Billing Q18.3 with anything listed here is a denial.

Written on Q18 — Other congenital malformations of face and neck

cleft lip and cleft palate (Q35-Q37)
conditions classified to Q67.0-Q67.4
congenital malformations of skull and face bones (Q75.-)
cyclopia (Q87.0)
dentofacial anomalies [including malocclusion] (M26.-)
malformation syndromes affecting facial appearance (Q87.0)
persistent thyroglossal duct (Q89.2)

Other codes that can never be billed with Q18.3

These codes carry an Excludes1 note pointing at Q18.3. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q18.3 alone.

Q75Other congenital malformations of skull and face bones

Risk adjustment

Q18.3 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

Q18.3 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders

How Q18.3 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Q18.3.

Pterygium›colli
Web, webbed›neck(pterygium colli)

Code history

Q18.3 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share Q18. If Q18.3 is not quite right, the correct code is usually one of these.

Questions about Q18.3

Is Q18.3 a billable ICD-10-CM code?: Yes. Q18.3 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Q18.3 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of eye, ear, face and neck (Q10-Q18).
What cannot be coded together with Q18.3?: Q18.3 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Q18.3 (Q18) and apply to it just the same.