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ICD-10-CM 2027 diagnosis code

N85.3Subinvolution of uterus

✓ Billable / specificFemale only

N85.3 is a valid, billable ICD-10-CM code for subinvolution of uterus. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N85.3

N85.3 is the ICD-10-CM diagnosis code for subinvolution of uterus. It belongs to category N85 (other noninflammatory disorders of uterus, except cervix), block N80-N98 (noninflammatory disorders of female genital tract) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

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.

In MS-DRG v44.0, it is part of the grouping logic for DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC, relative weight 1.8456), DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC, relative weight 1.2974), DRG 760 (Menstrual and Other Female Reproductive System Disorders with CC/MCC, relative weight 1.0129) and DRG 761 (Menstrual and Other Female Reproductive System Disorders without CC/MCC, relative weight 0.7041), in MDC 13 (Diseases and Disorders of the Female Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 621.1 (chronic subinvolution of uterus).

Coding notes

Excludes1Not coded here — never report together with this code
  • puerperal subinvolution of uterus (O90.89)

Notes that apply from higher levels

Instructions written at a parent level also apply to N85.3.

› From N85 Other noninflammatory disorders of uterus, except cervix
Excludes1
  • endometriosis (N80.-)
  • inflammatory diseases of uterus (N71.-)
  • noninflammatory disorders of cervix, except malposition (N86-N88)
  • polyp of corpus uteri (N84.0)
  • uterine prolapse (N81.-)

Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to N85.3.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 621.1Chronic subinvolution of uterusapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about N85.3

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.

What DRG does N85.3 group to?

N85.3 is used in the MS-DRG v44.0 logic for MS-DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC), MS-DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC), MS-DRG 760 (Menstrual and Other Female Reproductive System Disorders with CC/MCC) and MS-DRG 761 (Menstrual and Other Female Reproductive System Disorders without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for N85.3?

The CMS General Equivalence Mappings map N85.3 to ICD-9-CM 621.1.