2027 ICD-10-CM Diagnosis Code N73.4Female chronic pelvic peritonitis

ICD-10-CM Codes›N00–N99›N70-N77›N73

ICD-10-CM N73.4
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N73.4 is a billable ICD-10-CM diagnosis code for female chronic pelvic peritonitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 742 through 743, 757 through 759. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 67 closely related codes. Coders also document this condition as chronic inflammation of pelvic peritoneum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory diseases of female pelvic organs.

Code Identity

ICD-10-CM Code
N73.4
Billable Status
Yes — Valid for Submission
Code Describes
Female chronic pelvic peritonitis
Short Description
Female chronic pelvic peritonitis
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 CodeN73.4Female chronic pelvic peritonitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic inflammation of pelvic peritoneum
  • Chronic peritonitis
  • Pelvic peritonitis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N73.4: its own notes plus those printed at N73, block N70-N77, and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On N73.4 itself
  • tuberculous pelvic (female) peritonitis (A18.17)
From Block N70-N77 Inflammatory diseases of female pelvic organs applies to 39 codes
  • inflammatory diseases of female pelvic organs complicating:
  • abortion or ectopic or molar pregnancy (O00-O07, O08.0)
  • pregnancy, childbirth and the puerperium (O23.-, O75.3, O85, O86.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From N73 Other female pelvic inflammatory diseases applies to 9 codes
  • code (B95-B97), to identify infectious agent.

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block N70-N77 Inflammatory diseases of female pelvic organs applies to 39 codes
  • if applicable, pelvic abscess (K6A.0-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N73.4, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming N73.4: they are not reported together with it, unless the two conditions are unrelated.

  • K65 Peritonitis
    pelvic peritonitis, female (N73.3-N73.5) names N73.3-N73.5, which includes this code

Code Also 1

These codes say N73.4 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • K6A.0 Pelvic abscess
    female pelvic inflammatory disease (N73.-) names N73.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

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 N73.4 to ICD-9-CMHistory

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

ICD-9-CM
614.7 Chr pelv periton NEC-fem
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N73.4Overview

What is the ICD-10 code for female chronic pelvic peritonitis?

The ICD-10-CM code for female chronic pelvic peritonitis is N73.4 (sometimes written as N734). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N73.4 (Other female pelvic inflammatory diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report female chronic pelvic peritonitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N73.4 group to?

When female chronic pelvic peritonitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 759, 743, 758, 757, with relative weights from 0.7687 to 1.8448 depending on complications. Higher weights mean higher Medicare reimbursement.

Is N73.4 a CC or MCC?

CMS lists N73.4 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 67 closely related codes in its exclusion list.

Can N73.4 be reported with A18.17?

Not as a rule. The Excludes1 note on N73.4 lists "tuberculous pelvic (female) peritonitis (A18.17)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).