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ICD-10-CM 2027 diagnosis code

N80.A59Deep endometriosis of unspecified ureter

✓ Billable / specificFemale only

N80.A59 is a valid, billable ICD-10-CM code for deep endometriosis of unspecified ureter. 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 N80.A59

N80.A59 is the ICD-10-CM diagnosis code for deep endometriosis of unspecified ureter. It belongs to category N80 (endometriosis), 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 N80.A5, choose N80.A59 (unspecified ureter) only when documentation doesn't support a more specific option: right ureter (N80.A51), left ureter (N80.A52) and bilateral ureters (N80.A53).

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 698 (Other Kidney and Urinary Tract Diagnoses with MCC, relative weight 1.6398), DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC, relative weight 1.0003) and DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC, relative weight 0.6741), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract), 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 was added in FY2023, effective October 1, 2022.

Notes that apply from higher levels

Instructions written at a parent level also apply to N80.A59.

› From N80.A5 Deep endometriosis of ureter
Code also
  • , if applicable, obstructive and reflux uropathy (N13.-)

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

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.

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
  • FY2023 (effective 10/1/2022): Added
  • No changes since FY2023.

Common questions about N80.A59

Is N80.A59 billable?

Yes. N80.A59 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N80.A59 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N80.A59 as a principal diagnosis.

Is N80.A59 a CC or MCC?

No. N80.A59 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does N80.A59 group to?

N80.A59 is used in the MS-DRG v44.0 logic for MS-DRG 698 (Other Kidney and Urinary Tract Diagnoses with MCC), MS-DRG 699 (Other Kidney and Urinary Tract Diagnoses with CC) and MS-DRG 700 (Other Kidney and Urinary Tract Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.