2026 ICD-10-CM Diagnosis Code N80.391Superficial endometriosis of the pelvic peritoneum, other specified sites

ICD-10-CM Codes›N00–N99›N80-N98›N80

ICD-10-CM N80.391
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N80.391 is a billable ICD-10-CM diagnosis code for superficial endometriosis of the pelvic peritoneum, other specified sites. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endometriosis.

Code Identity

ICD-10-CM Code
N80.391
Billable Status
Yes — Valid for Submission
Code Describes
Superficial endometriosis of the pelvic peritoneum, other specified sites
Short Description
Superfic endometriosis of the pelvic peritoneum, oth sites
Parent Code
N80.39
Endometriosis of other pelvic peritoneum

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN80Endometriosis
This CodeN80.391Superficial endometriosis of the pelvic peritoneum, other specified sites

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Endometriosis
      • pelvic
        • peritoneum
          • specified sites, NEC
            • superficial

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 N80.391 replaces the following previously assigned code(s):

  • N80.3 - Endometriosis of pelvic peritoneum
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 N80.391Overview

Is N80.391 (Endometriosis of other pelvic peritoneum) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report superficial endometriosis of the pelvic peritoneum, other specified sites on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N80.391 group to?

When superficial endometriosis of the pelvic peritoneum, other specified sites 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.