Is Q92.1 a billable ICD-10-CM code?

Yes. Q92.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does Q92.1 sit in the tabular list?

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

What cannot be coded together with Q92.1?

Q92.1 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 Q92.1 (Q92) and apply to it just the same.

Q92.1

Q92.1 — Whole chromosome trisomy, mosaicism (mitotic nondisjunction)

Billable / specific codeICD-10-CMPOA exempt

Q92.1 is a billable, specific ICD-10-CM code for whole chromosome trisomy, mosaicism (mitotic nondisjunction). It is valid for submission on a claim.

Excludes1 inherited from the categories above Q92.1

These are not written on Q92.1, but they bind it: a note on a category applies to every code beneath it. Billing Q92.1 with anything listed here is a denial.

Written on Q92 — Other trisomies and partial trisomies of the autosomes, not elsewhere classified

trisomies of chromosomes 13, 18, 21 (Q90-Q91)

Risk adjustment

Q92.1 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.

How Q92.1 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 Q92.1.

Trisomy›whole chromosome›mitotic nondisjunction
Trisomy›whole chromosome›mosaicism
Trisomy›chromosome specified NEC›whole›mitotic nondisjunction
Trisomy›chromosome specified NEC›whole›mosaicism

Code history

Q92.1 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 Q92. If Q92.1 is not quite right, the correct code is usually one of these.

Questions about Q92.1

Is Q92.1 a billable ICD-10-CM code?: Yes. Q92.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Q92.1 sit in the tabular list?: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Chromosomal abnormalities, not elsewhere classified (Q90-Q99).
What cannot be coded together with Q92.1?: Q92.1 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 Q92.1 (Q92) and apply to it just the same.