ICD-10-CM 2027
ICD-10 code for uterus subinvolution
From the official ICD-10-CM alphabetic index entry “Subinvolution › uterus (chronic) (nonpuerperal)”. Page updated September 29, 2026.
About coding uterus subinvolution
The ICD-10-CM code for uterus subinvolution is N85.3 (Subinvolution of uterus). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on N85.3.
Within N85 (other noninflammatory disorders of uterus, except cervix), N85.3 is specifically for subinvolution of uterus. Related codes cover endometrial hyperplasia (N85.0), hypertrophy of uterus (N85.2), malposition of uterus (N85.4), inversion of uterus (N85.5), intrauterine synechiae (N85.6), Hematometra (N85.7), other specified noninflammatory disorders of uterus (N85.8), noninflammatory disorder of uterus, unspecified (N85.9) and 1 more.
Don't report N85.3 together with the conditions in its Excludes1 note: puerperal subinvolution of uterus (O90.89).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific uterus subinvolution codes (official index)
- puerperal O90.89 — Other complications of the puerperium, not elsewhere classified
Don't confuse with (Excludes1 for N85.3)
- puerperal subinvolution of uterus (O90.89)
Common questions about uterus subinvolution ICD-10 codes
What is the ICD-10 code for uterus subinvolution?
- N85.3 — Subinvolution of uterus. More specific codes apply when the documentation supports them: O90.89.
What is the ICD-10 code for puerperal uterus subinvolution?
- O90.89 — Other complications of the puerperium, not elsewhere classified.
Is N85.3 billable?
- Yes. N85.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N85.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N85.3 as a principal diagnosis.
Is N85.3 a CC or MCC?
- No. N85.3 is neither a CC nor an MCC under MS-DRG v44.0.