2026 ICD-10-CM Diagnosis Code N73.0Acute parametritis and pelvic cellulitis

ICD-10-CM Codes›N00–N99›N70-N77›N73

ICD-10-CM N73.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N73.0 is a billable ICD-10-CM diagnosis code for acute parametritis and pelvic cellulitis. 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 acute cellulitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory diseases of female pelvic organs.

Code Identity

ICD-10-CM Code
N73.0
Billable Status
Yes — Valid for Submission
Code Describes
Acute parametritis and pelvic cellulitis
Short Description
Acute parametritis and pelvic cellulitis
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 CodeN73.0Acute parametritis and pelvic cellulitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute cellulitis
  • Acute female pelvic cellulitis
  • Acute parametritis
  • Female pelvic cellulitis
  • Parametritis

Tabular List NotesGuidance

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

Inclusion Terms

  • Abscess of broad ligament
  • Abscess of parametrium
  • Pelvic cellulitis, female

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.

    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • broad ligament
        • acute
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • parametric, parametrium
        • acute
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • suprapelvic, acute
    • Cellulitis(diffuse) (phlegmonous) (septic) (suppurative)
      • broad ligament
        • acute
    • Cellulitis(diffuse) (phlegmonous) (septic) (suppurative)
      • Douglas' cul-de-sac or pouch
        • acute
    • Cellulitis(diffuse) (phlegmonous) (septic) (suppurative)
      • pelvis, pelvic (chronic)
        • female
          • acute
    • Cellulitis(diffuse) (phlegmonous) (septic) (suppurative)
      • periuterine
        • acute
    • Cellulitis(diffuse) (phlegmonous) (septic) (suppurative)
      • round ligament
        • acute
    • Disease, diseased
      • pelvis, pelvic
        • inflammatory (female)
          • acute
    • Inflammation, inflamed, inflammatory(with exudation)
      • Douglas' cul-de-sac or pouch (chronic)
    • Inflammation, inflamed, inflammatory(with exudation)
      • parametrium
    • Parametritis
      • acute

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

  • Parametritis

    inflammation of the parametrium, the connective tissue of the pelvic floor, extending from the subserous coat of the uterus laterally between the layers of the broad ligament.

  • Broad Ligament

    a broad fold of peritoneum that extends from the side of the uterus to the wall of the pelvis.

Patient EducationClinical

Cellulitis

Cellulitis is an infection of the skin and deep underlying tissues. Group A strep (streptococcal) bacteria are the most common cause. The bacteria enter your body when you get an injury such as a bruise, burn, surgical cut, or wound.

Read the full article at MedlinePlus

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

Convert N73.0 to ICD-9-CMHistory

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

ICD-9-CM
614.3 Acute parametritis
Exact Match The mapping is direct, with no qualifiers.

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 N73.0Overview

Is N73.0 (Other female pelvic inflammatory diseases) a billable code?

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

What MS-DRG does N73.0 group to?

When acute parametritis and pelvic cellulitis 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 N73.0?

Under the General Equivalence Mappings, acute parametritis and pelvic cellulitis converts to ICD-9-CM 614.3 (acute parametritis). The mapping is a direct match.

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.