Is Q99.818 a billable ICD-10-CM code?

Yes. Q99.818 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Q99.818 sit in the tabular list?

Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Chromosomal abnormalities, not elsewhere classified (Q90-Q99).

Q99.818

Q99.818 — Other Usher syndrome

Billable / specific codeICD-10-CMPOA exempt

Q99.818 is a billable, specific ICD-10-CM code for other usher syndrome. It is valid for submission on a claim.

Inclusion terms

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

Usher syndrome, type 4

Risk adjustment

Q99.818 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 history

What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.

addedFY2024-FY2026
Other Usher syndrome

Related codes at this level

Codes that share Q99.81. If Q99.818 is not quite right, the correct code is usually one of these.

Questions about Q99.818

Is Q99.818 a billable ICD-10-CM code?: Yes. Q99.818 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Q99.818 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Chromosomal abnormalities, not elsewhere classified (Q90-Q99).