2026 ICD-10-CM Diagnosis Code N73.5Female pelvic peritonitis, unspecified

ICD-10-CM Codes›N00–N99›N70-N77›N73

ICD-10-CM N73.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N73.5 is a billable ICD-10-CM diagnosis code for female pelvic peritonitis, unspecified. 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, 757 through 759. Coders also document this condition as abscess of female pelvis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory diseases of female pelvic organs.

Code Identity

ICD-10-CM Code
N73.5
Billable Status
Yes — Valid for Submission
Code Describes
Female pelvic peritonitis, unspecified
Short Description
Female pelvic peritonitis, unspecified
Same as the full description in the CMS dataset.
Parent Code
N73
Other female pelvic inflammatory diseases

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN70-N77Inflammatory diseases of female pelvic organs
CategoryN73Other female pelvic inflammatory diseases
This CodeN73.5Female pelvic peritonitis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of female pelvis
  • Abscess of pouch of Douglas
  • Chronic abscess of female pelvis
  • Chronic abscess of pouch of Douglas
  • Pelvic peritonitis

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.

    • Peritonitis(adhesive) (bacterial) (fibrinous) (hemorrhagic) (idiopathic) (localized) (perforative) (primary) (with adhesions) (with effusion)
      • pelvic
        • female

Clinical ClassificationClinical

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

CCSR GEN018
Inflammatory diseases of female pelvic organs
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Pelvic Peritonitis

    inflammation of the peritoneum surrounding the pelvic organs.

Patient EducationClinical

Peritoneal Disorders

Your peritoneum is the tissue that lines your abdominal wall and covers most of the organs in your abdomen. A liquid, peritoneal fluid, lubricates the surface of this tissue.

Read the full article at MedlinePlus

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

Convert N73.5 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
614.9 Fem pelv inflam dis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N73.5Overview

Is N73.5 (Other female pelvic inflammatory diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report female pelvic peritonitis, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N73.5 group to?

When female pelvic peritonitis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 743, 757, 758, 759, with relative weights from 0.6636 to 1.8348 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N73.5?

Under the General Equivalence Mappings, female pelvic peritonitis, unspecified converts to ICD-9-CM 614.9 (fem pelv inflam dis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.