O91.212 — Nonpurulent mastitis associated with pregnancy, second trimester
Is O91.212 billable?
Yes — O91.212 is billable for FY2027. O91.212 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. O91.212 may be submitted for encounters from October 1, 2026 through September 30, 2027.
O91.212 at a glance
| Code | O91.212 |
|---|---|
| Description | Nonpurulent mastitis associated with pregnancy, second trimester |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does O91.212 group to?
O91.212 sits in MDC 14 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 817Other Antepartum Diagnoses with O.R. Procedures with MCCsurgical
- 818Other Antepartum Diagnoses with O.R. Procedures with CCsurgical
- 819Other Antepartum Diagnoses with O.R. Procedures without CC/MCCsurgical
How is O91.212 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O91.21, the nearest indexed parent of O91.212. Use them to find the family, then select the specific code.
- Mastitis › obstetric › associated with › pregnancy (acute) (diffuse) (nonpuerperal) (subacute)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O91.212 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- supervision of normal pregnancy (Z34.-)
Use additional code — inherited from Chapter 15
Report an additional code alongside O91.212 to fully describe the condition. O91.212 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Use additional code — inherited from O91
Report an additional code alongside O91.212 to fully describe the condition. O91.212 is sequenced first.
- code to identify infection
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O91.212, but a patient may have both at the same time. When documentation supports it, O91.212 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O85-O92
The conditions below are not part of O91.212, but a patient may have both at the same time. When documentation supports it, O91.212 and the excluded code may both be reported.
How long has O91.212 existed?
O91.212 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.