MCMCB Pro
O99.324

O99.324Drug use complicating childbirth

Billable / specific codeICD-10-CM

O99.324 is a billable, specific ICD-10-CM code for drug use complicating childbirth. It is valid for submission on a claim.

Risk adjustment

O99.324 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

O99.324 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.

  • A57189Billing and Coding: Serum Magnesium

How O99.324 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 O99.324.

  • Deliverycomplicatedbydrug use

Related codes at this level

Codes that share O99.32. If O99.324 is not quite right, the correct code is usually one of these.

Questions about O99.324

Is O99.324 a billable ICD-10-CM code?
Yes. O99.324 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does O99.324 sit in the tabular list?
Pregnancy, childbirth and the puerperium (O00-O9A), in the block Other obstetric conditions, not elsewhere classified (O94-O9A).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.