Is O99.331 a billable ICD-10-CM code?

Yes. O99.331 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does O99.331 sit in the tabular list?

Pregnancy, childbirth and the puerperium (O00-O9A), in the block Other obstetric conditions, not elsewhere classified (O94-O9A).

O99.331

O99.331 — Smoking (tobacco) complicating pregnancy, first trimester

Billable / specific codeICD-10-CM

O99.331 is a billable, specific ICD-10-CM code for smoking (tobacco) complicating pregnancy, first trimester. It is valid for submission on a claim.

Excludes2 inherited from the categories above O99.331

Also inherited, and the opposite of Excludes1: these conditions are not part of O99.331, but a patient can have both, so you may code both.

Written on O99 — Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)

Risk adjustment

O99.331 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

O99.331 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 O99.33. If O99.331 is not quite right, the correct code is usually one of these.

Questions about O99.331

Is O99.331 a billable ICD-10-CM code?: Yes. O99.331 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does O99.331 sit in the tabular list?: Pregnancy, childbirth and the puerperium (O00-O9A), in the block Other obstetric conditions, not elsewhere classified (O94-O9A).