2026 ICD-10-CM Diagnosis Code N61Inflammatory disorders of breast

ICD-10-CM Codes›N00–N99›N60-N65›N61

ICD-10-CM N61
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N61 is a non-billable ICD-10-CM category code for inflammatory disorders of breast, so it cannot be submitted on claims. Use a more specific code from this category instead, such as N61.0, N61.1, N61.20, and N61.21. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonmalignant breast conditions.

Code Identity

ICD-10-CM Code
N61
Billable Status
No — Non-Billable Category
Code Describes
Inflammatory disorders of breast
Chapter
N60-N65
Disorders of breast

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN60-N65Disorders of breast
CategoryN61Inflammatory disorders of breast
This CodeN61Inflammatory disorders of breast

Specific Coding for Inflammatory disorders of breastOverview

Non-specific codes like N61 require more characters. Use one of these billable codes instead:

  • Use N61.0 for Mastitis without abscess

  • Use N61.1 for Abscess of the breast and nipple

  • N61.2 for Granulomatous mastitis

  • Use N61.20 for Granulomatous mastitis, unspecified breast

  • Use N61.21 for Granulomatous mastitis, right breast

  • Use N61.22 for Granulomatous mastitis, left breast

  • Use N61.23 for Granulomatous mastitis, bilateral breast

Tabular List NotesGuidance

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

Type 1 Excludes

  • inflammatory carcinoma of breast C50.A
  • inflammatory disorder of breast associated with childbirth O91
  • neonatal infective mastitis P39.0
  • thrombophlebitis of breast Mondor's disease I80.8

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN017
Nonmalignant breast conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Breast Diseases

Breast diseases include various conditions and changes in your breast. Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges of fluids that are not breast milk.

The full article covers:

  • What are breast diseases?
  • What are the symptoms of breast disease?
  • How are breast diseases diagnosed?
  • What are the treatments for breast disease?

Read the full article at MedlinePlus

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

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 N61Overview

Is N61 (Inflammatory disorders of breast) a billable code?

No. This is a category header that groups the codes for inflammatory disorders of breast, and headers cannot be submitted on claims. Claims for inflammatory disorders of breast need a more specific code from this category, such as N61.0, N61.1, and N61.20.

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.