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ICD-10-CM 2027 diagnosis code

N80.A42Superficial endometriosis of left ureter

✓ Billable / specificFemale only

N80.A42 is a valid, billable ICD-10-CM code for superficial endometriosis of left 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.A42

N80.A42 is the ICD-10-CM diagnosis code for superficial endometriosis of left 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.A4 (superficial endometriosis of ureter), N80.A42 is specifically for superficial endometriosis of left ureter. Related codes cover right ureter (N80.A41), bilateral ureters (N80.A43) and unspecified ureter (N80.A49).

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.A42.

› From N80.A4 Superficial 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.A42

Is N80.A42 billable?

Yes. N80.A42 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N80.A42 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N80.A42 as a principal diagnosis.

Is N80.A42 a CC or MCC?

No. N80.A42 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does N80.A42 group to?

N80.A42 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.