2026 ICD-10-CM Diagnosis Code N80.109Endometriosis of ovary, unspecified side, unspecified depth

ICD-10-CM Codes›N00–N99›N80-N98›N80

ICD-10-CM N80.109
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N80.109 is a billable ICD-10-CM diagnosis code for endometriosis of ovary, unspecified side, unspecified depth. 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 chocolate cyst of ovary. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endometriosis.

Code Identity

ICD-10-CM Code
N80.109
Billable Status
Yes — Valid for Submission
Code Describes
Endometriosis of ovary, unspecified side, unspecified depth
Short Description
Endometriosis of ovary, unspecified side, unspecified depth
Same as the full description in the CMS dataset.
Parent Code
N80.10
Endometriosis of ovary, unspecified depth

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN80Endometriosis
This CodeN80.109Endometriosis of ovary, unspecified side, unspecified depth

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chocolate cyst of ovary
  • Deep endometriosis
  • Endometriosis of ovary
  • Rupture of ovary
  • Ruptured cyst of ovary
  • Ruptured endometrial cystoma of ovary

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Endometriosis of ovary NOS

Clinical ClassificationClinical

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

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

Patient EducationClinical

Endometriosis

The uterus, or womb, is the place where a fetus grows during pregnancy. The uterus is lined with tissue (endometrium). Endometriosis is a disease in which tissue like the lining of the uterus grows in other places in your body. These patches of tissue are called "implants," "nodules," or "lesions." They are most often found:

The full article covers:

  • What is endometriosis?
  • What causes endometriosis?
  • Who is at risk for endometriosis?
  • What are the symptoms of endometriosis?
  • How is endometriosis diagnosed?
  • What are the treatments for endometriosis?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement N80.109 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 N80.109Overview

Is N80.109 (Endometriosis of ovary, unspecified depth) a billable code?

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

What MS-DRG does N80.109 group to?

When endometriosis of ovary, unspecified side, unspecified depth 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.