Is Q18 a billable ICD-10-CM code?

No. Q18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does Q18 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?

Q18 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

Q18

Q18 — Other congenital malformations of face and neck

Non-billable headerICD-10-CM

Q18 is a non-billable header ICD-10-CM code for other congenital malformations of face and neck. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

These codes carry an Excludes1 note pointing at Q18. 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 alone.

Q17Other congenital malformations of ear
Q17.4Misplaced ear
Q38Other congenital malformations of tongue, mouth and pharynx
Q38.0Congenital malformations of lips, not elsewhere classified
Q75Other congenital malformations of skull and face bones
H70.8Other mastoiditis and related conditions
K13.0Diseases of lips

Risk adjustment

Q18 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.

Code to one of these instead Q18

10 child codes. Green means billable.

Questions about Q18

Is Q18 a billable ICD-10-CM code?: No. Q18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does Q18 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?: Q18 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.