2026 ICD-10-CM Diagnosis Code N71.1Chronic inflammatory disease of uterus

ICD-10-CM Codes›N00–N99›N70-N77›N71

ICD-10-CM N71.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N71.1 is a billable ICD-10-CM diagnosis code for chronic inflammatory disease of uterus. 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
N71.1
Billable Status
Yes — Valid for Submission
Code Describes
Chronic inflammatory disease of uterus
Short Description
Chronic inflammatory disease of uterus
Same as the full description in the CMS dataset.
Parent Code
N71
Inflammatory disease of uterus, except cervix

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN70-N77Inflammatory diseases of female pelvic organs
CategoryN71Inflammatory disease of uterus, except cervix
This CodeN71.1Chronic inflammatory disease of uterus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute endometritis
  • Acute on chronic endometritis
  • Acute uterine inflammatory disease
  • Chronic endometritis
  • Chronic endomyometritis
  • Chronic myometritis
  • Chronic perimetritis
  • Chronic peritonitis
  • Chronic pyometra
  • Chronic uterine inflammatory disease
  • Endomyometritis
  • Myometritis
  • Perimetritis
  • Pyometra
  • Pyometra co-occurrent and due to chronic inflammatory disease of uterus

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.

    • Endometritis(decidual) (nonspecific) (purulent) (senile) (atrophic) (suppurative)
      • chronic

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

  • Pyometra

    an accumulation of pus in the uterine cavity (uterus). pyometra generally indicates the presence of infections.

  • Myometritis

    inflammation of the myometrium.

  • Postpartum Endometritis|Puerperal Endometritis|Puerperal Endometritis|Puerperal Endomyometritis

    infection of the endometrium, decidua and/or myometrium occurring at any time between birth and 42 days postpartum.

  • Chronic Endometritis

    a non-granulomatous or granulomatous chronic inflammation of the endometrium. causes include sexually transmitted pathogens and gynecological procedures. patients may present with irregular bleeding.

  • Non Specific Chronic Endometritis

    chronic endometritis characterized by the presence of plasmacytic infiltrates in the endometrium. there are no granulomas present.

  • Acute Endometritis

    an acute, usually bacterial infection affecting the endometrium. it is characterized by the presence of neutrophils or microabscesses in the endometrial glands. symptoms include fever, lower abdominal pain, and vaginal discharge.

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 N71.1 to ICD-9-CMHistory

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

ICD-9-CM
615.1 Chr uterine inflammation
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 N71.1Overview

Is N71.1 (Inflammatory disease of uterus, except cervix) a billable code?

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

What MS-DRG does N71.1 group to?

When chronic inflammatory disease of uterus 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 N71.1?

Under the General Equivalence Mappings, chronic inflammatory disease of uterus converts to ICD-9-CM 615.1 (chr uterine inflammation). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.