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ICD-10-CM 2027 diagnosis code

N73.3Female acute pelvic peritonitis

✓ Billable / specificMCC — major complication/comorbidityFemale only

N73.3 is a valid, billable ICD-10-CM code for female acute pelvic peritonitis. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N73.3

N73.3 is the ICD-10-CM diagnosis code for female acute pelvic peritonitis. It belongs to category N73 (other female pelvic inflammatory diseases), block N70-N77 (inflammatory diseases of female pelvic organs) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N73 (other female pelvic inflammatory diseases), N73.3 is specifically for female acute pelvic peritonitis. Related codes cover acute parametritis and pelvic cellulitis (N73.0), chronic parametritis and pelvic cellulitis (N73.1), unspecified parametritis and pelvic cellulitis (N73.2), female chronic pelvic peritonitis (N73.4), female pelvic peritonitis, unspecified (N73.5), female pelvic peritoneal adhesions (postinfective) (N73.6), other specified female pelvic inflammatory diseases (N73.8) and female pelvic inflammatory disease, unspecified (N73.9).

Use an additional code (B95-B97), to identify infectious agent.

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC, relative weight 1.8456), DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC, relative weight 1.2974), DRG 757 (Infections, Female Reproductive System with MCC, relative weight 1.4649), DRG 758 (Infections, Female Reproductive System with CC, relative weight 0.9908) and DRG 759 (Infections, Female Reproductive System without CC/MCC, relative weight 0.7691), in MDC 13 (Diseases and Disorders of the Female Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 614.5 (acute or unspecified pelvic peritonitis, female).

Notes that apply from higher levels

Instructions written at a parent level also apply to N73.3.

› From N73 Other female pelvic inflammatory diseases
Use additional code
  • code (B95-B97), to identify infectious agent.

Broader instructions also apply from N70-N77 Inflammatory diseases of female pelvic organs and Chapter 14: Diseases of the genitourinary system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to N73.3.

Codes whose notes reference N73.3

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 614.5Acute or unspecified pelvic peritonitis, femaleexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about N73.3

Is N73.3 billable?

Yes. N73.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N73.3 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N73.3 as a principal diagnosis.

Is N73.3 a CC or MCC?

N73.3 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does N73.3 group to?

N73.3 is used in the MS-DRG v44.0 logic for MS-DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC), MS-DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC), MS-DRG 757 (Infections, Female Reproductive System with MCC), MS-DRG 758 (Infections, Female Reproductive System with CC) and MS-DRG 759 (Infections, Female Reproductive System without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for N73.3?

The CMS General Equivalence Mappings map N73.3 to ICD-9-CM 614.5.