ICD-10-CM 2027 diagnosis code
N85.AIsthmocele
N85.A is a valid, billable ICD-10-CM code for isthmocele. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code last changed in FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About N85.A
N85.A is the ICD-10-CM diagnosis code for isthmocele. 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.A is specifically for isthmocele. Related codes cover endometrial hyperplasia (N85.0), hypertrophy of uterus (N85.2), subinvolution of uterus (N85.3), 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) and 1 more.
Don't report N85.A together with the conditions in its Excludes1 note: maternal care for cesarean scar defect (isthmocele) (O34.22).
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 was added in FY2023, effective October 1, 2022.
Coding notes
- Isthmocele (non-pregnant state)
- maternal care for cesarean scar defect (isthmocele) (O34.22)
Notes that apply from higher levels
Instructions written at a parent level also apply to N85.A.
Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to N85.A.
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.
MDC 13 · Diseases and Disorders of the Female Reproductive System
MDC 13 · Diseases and Disorders of the Female Reproductive System
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2023 (effective 10/1/2022): Added
- No changes since FY2023.
Common questions about N85.A
Is N85.A billable?
- Yes. N85.A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N85.A be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N85.A as a principal diagnosis.
Is N85.A a CC or MCC?
- No. N85.A is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does N85.A group to?
- N85.A 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.