2026 ICD-10-CM Diagnosis Code N80.123Deep endometriosis of bilateral ovaries

ICD-10-CM Codes›N00–N99›N80-N98›N80

ICD-10-CM N80.123
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N80.123 is a billable ICD-10-CM diagnosis code for deep endometriosis of bilateral ovaries. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 742 through 743, 760 through 761. Coders also document this condition as bilateral endometriosis of ovaries. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endometriosis.

Code Identity

ICD-10-CM Code
N80.123
Billable Status
Yes — Valid for Submission
Code Describes
Deep endometriosis of bilateral ovaries
Short Description
Deep endometriosis of bilateral ovaries
Same as the full description in the CMS dataset.
Parent Code
N80.12
Deep endometriosis of ovary

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN80Endometriosis
This CodeN80.123Deep endometriosis of bilateral ovaries

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral endometriosis of ovaries
  • Chocolate cyst of ovary
  • Cyst of bilateral ovaries
  • Deep endometriosis
  • Endometrial cyst of right ovary
  • Endometrioma of both ovaries
  • Endometrioma of left ovary
  • Endometriosis of left ovary
  • Endometriosis of right ovary

Clinical ClassificationClinical

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

CCSR GEN019
Endometriosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement N80.123 replaces the following previously assigned code(s):

  • N80.1 - Endometriosis of ovary
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N80.123Overview

Is N80.123 (Deep endometriosis of ovary) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report deep endometriosis of bilateral ovaries on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N80.123 group to?

When deep endometriosis of bilateral ovaries is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 743, 760, 761, with relative weights from 0.5696 to 1.8348 depending on complications. Higher weights mean higher Medicare reimbursement.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.