2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Inflammatory disorders of breast
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N61: its own notes plus those printed at block N60-N65 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 N61 itself
  • 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)
From Block N60-N65 Disorders of breast applies to 60 codes
  • disorders of breast associated with childbirth (O91-O92)

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)

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

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N61Overview

What is the ICD-10 code for inflammatory disorders of breast?

N61 is the ICD-10-CM category for inflammatory disorders of breast, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

Can N61 be reported with a code from C50.A?

Not as a rule. The Excludes1 note on N61 lists "inflammatory carcinoma of breast (C50.A-)". 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).