2027 ICD-10-CM Diagnosis Code N85.3Subinvolution of uterus

ICD-10-CM Codes›N00–N99›N80-N98›N85

ICD-10-CM N85.3
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N85.3 is a billable ICD-10-CM diagnosis code for subinvolution of uterus. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 742 through 743, 760 through 761. Coders also document this condition as chronic subinvolution of uterus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified female genital disorders.

Code Identity

ICD-10-CM Code
N85.3
Billable Status
Yes — Valid for Submission
Code Describes
Subinvolution of uterus
Short Description
Subinvolution of uterus
Same as the full description in the CMS dataset.
Parent Code
N85
Other noninflammatory disorders of uterus, except cervix

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN85Other noninflammatory disorders of uterus, except cervix
This CodeN85.3Subinvolution of uterus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic subinvolution of uterus

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N85.3: its own notes plus those printed at N85 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On N85.3 itself
  • puerperal subinvolution of uterus (O90.89)
From N85 Other noninflammatory disorders of uterus, except cervix applies to 12 codes
  • endometriosis (N80.-)
  • inflammatory diseases of uterus (N71.-)
  • noninflammatory disorders of cervix, except malposition (N86-N88)
  • polyp of corpus uteri (N84.0)
  • uterine prolapse (N81.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN025
Other specified female genital disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Uterine Diseases

The uterus, or womb, is the place where a fetus grows during pregnancy. Uterine diseases are conditions that affect the uterus. These diseases can be benign (not cancer) or malignant (cancerous). They may affect your menstrual periods, your ability to get pregnant, or the health of your reproductive organs.

The full article covers:

  • What are uterine diseases?
  • What causes uterine diseases?
  • What are the symptoms of uterine diseases?
  • How are uterine diseases diagnosed?
  • What are the treatments for uterine diseases?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N85.3 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
621.1 Chr uterine subinvolutn
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N85.3Overview

What is the ICD-10 code for subinvolution of uterus?

The ICD-10-CM code for subinvolution of uterus is N85.3 (sometimes written as N853). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N85.3 (Other noninflammatory disorders of uterus, except cervix) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report subinvolution of uterus on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N85.3 group to?

When subinvolution of uterus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 743, 760, 761, with relative weights from 0.7039 to 1.8448 depending on complications. Higher weights mean higher Medicare reimbursement.

Can N85.3 be reported with O90.89?

Not as a rule. The Excludes1 note on N85.3 lists "puerperal subinvolution of uterus (O90.89)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of N85.3?

Under the General Equivalence Mappings, subinvolution of uterus converts to ICD-9-CM 621.1 (chr uterine subinvolutn). The mapping is approximate, so confirm the match fits the documentation.