2026 ICD-10-CM Diagnosis Code N73.9Female pelvic inflammatory disease, unspecified

ICD-10-CM Codes›N00–N99›N70-N77›N73

ICD-10-CM N73.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N73.9 is a billable ICD-10-CM diagnosis code for female pelvic inflammatory disease, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory diseases of female pelvic organs.

Code Identity

ICD-10-CM Code
N73.9
Billable Status
Yes — Valid for Submission
Code Describes
Female pelvic inflammatory disease, unspecified
Short Description
Female pelvic inflammatory disease, 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 CodeN73.9Female pelvic inflammatory disease, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of female pelvis
  • Acute abscess of female pelvis
  • Acute female pelvic inflammatory disease following procedure
  • Acute on chronic pelvic inflammatory disease
  • Acute pelvic inflammatory disease
  • Bacterial genital infection
  • Bacterial urogenital infection
  • Chronic pelvic inflammatory disease
  • Female genital infection
  • Female genital tract infection
  • Female pelvic inflammatory disease
  • Female pelvic inflammatory disease caused by Mycoplasma genitalium
  • Genital infection
  • Genital mycoplasma infection
  • Infection of female genital system following medically assisted reproduction
  • Inflammatory disease of female genital structure
  • Inflammatory disorder of genitourinary system
  • Mycoplasma genitalium infection
  • Mycoplasmal pelvic inflammatory disease
  • Pathogen-negative nonspecific genital infection
  • Pelvic inflammatory disease caused by Metamycoplasma hominis
  • Postoperative abscess of female pelvis
  • Postoperative intra-abdominal abscess
  • Postprocedural intraabdominal abscess

Tabular List NotesGuidance

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

Inclusion Terms

  • Female pelvic infection or inflammation NOS

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.

    • Disease, diseased
      • female pelvic inflammatory
    • Disease, diseased
      • pelvis, pelvic
        • inflammatory (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

Patient EducationClinical

Pelvic Inflammatory Disease

Pelvic inflammatory disease (PID) is an infection of the uterus, ovaries, and other female reproductive organs. PID causes scarring in these organs. This can lead to infertility, ectopic pregnancy, pelvic pain, abscesses (a collection of pus), and other serious problems.

The full article covers:

  • What is pelvic inflammatory disease?
  • What causes pelvic inflammatory disease?
  • What are the symptoms of pelvic inflammatory disease?
  • How is pelvic inflammatory disease diagnosed?
  • What is the treatment for pelvic inflammatory disease?
  • Can pelvic inflammatory disease be prevented?

Read the full article at MedlinePlus

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

Convert N73.9 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.
ICD-9-CM
616.9 Female gen inflam 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 N73.9Overview

Is N73.9 (Other female pelvic inflammatory diseases) a billable code?

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

What MS-DRG does N73.9 group to?

When female pelvic inflammatory disease, 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 N73.9?

Under the General Equivalence Mappings, female pelvic inflammatory disease, unspecified converts to ICD-9-CM 614.9 (fem pelv inflam dis NOS) and 616.9 (female gen inflam 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.