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O91.212

O91.212Nonpurulent mastitis associated with pregnancy, second trimester

Billable / specific codeICD-10-CM

O91.212 is a billable, specific ICD-10-CM code for nonpurulent mastitis associated with pregnancy, second trimester. It is valid for submission on a claim.

Risk adjustment

O91.212 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

O91.212 is named in 4 Medicare coverage policies 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

  • A56587Billing and Coding: Cosmetic and Reconstructive Surgery
  • A58573Billing and Coding: Cosmetic and Reconstructive Surgery
  • A58774Billing and Coding: Cosmetic and Reconstructive Surgery
  • A59299Billing and Coding: Cosmetic and Reconstructive Surgery

Related codes at this level

Codes that share O91.21. If O91.212 is not quite right, the correct code is usually one of these.

Questions about O91.212

Is O91.212 a billable ICD-10-CM code?
Yes. O91.212 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does O91.212 sit in the tabular list?
Pregnancy, childbirth and the puerperium (O00-O9A), in the block Complications predominantly related to the puerperium (O85-O92).
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.