2026 ICD-10-CM Diagnosis Code N61.1Abscess of the breast and nipple

ICD-10-CM Codes›N00–N99›N60-N65›N61

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

N61.1 is a billable ICD-10-CM diagnosis code for abscess of the breast and nipple. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 600 through 601. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonmalignant breast conditions.

Code Identity

ICD-10-CM Code
N61.1
Billable Status
Yes — Valid for Submission
Code Describes
Abscess of the breast and nipple
Short Description
Abscess of the breast and nipple
Same as the full description in the CMS dataset.
Parent Code
N61
Inflammatory disorders of breast

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN60-N65Disorders of breast
CategoryN61Inflammatory disorders of breast
This CodeN61.1Abscess of the breast and nipple

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abscess of breast
  • Abscess of breast, associated with childbirth
  • Abscess of chest wall
  • Abscess of nipple
  • Abscess of skin of breast
  • Acute abscess of areola
  • Acute abscess of breast
  • Acute mastitis
  • Carbuncle of breast
  • Carbuncle of chest wall
  • Carbuncle of pectoral region
  • Cellulitis and abscess of breast
  • Cellulitis and abscess of trunk
  • Cellulitis of breast
  • Cellulitis of pectoral region
  • Chronic abscess of areola
  • Chronic abscess of breast
  • Chronic disease of breast
  • Chronic non-puerperal breast abscess
  • Chronic subareolar non-puerperal abscess
  • Furuncle of breast
  • Furuncle of chest wall
  • Furuncle of pectoral region
  • Intramammary breast abscess
  • Lump of subareolar area of breast
  • Mammary fistula
  • Nonpuerperal abscess of areola
  • Nonpuerperal abscess of breast
  • Nonpuerperal abscess of left areola
  • Nonpuerperal abscess of left breast
  • Nonpuerperal abscess of right areola
  • Nonpuerperal abscess of right breast
  • Obstetric abscess of breast
  • Obstetric abscess of nipple
  • Retromammary abscess associated with childbirth
  • Retromammary breast abscess
  • Streptococcal mastitis
  • Subareolar abscess associated with childbirth
  • Subareolar breast abscess
  • Submammary abscess associated with childbirth

Tabular List NotesGuidance

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

Inclusion Terms

  • Abscess (acute) (chronic) (nonpuerperal) of areola
  • Abscess (acute) (chronic) (nonpuerperal) of breast
  • Carbuncle of breast
  • Mastitis with abscess

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.

    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • areola (acute) (chronic) (nonpuerperal)
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • breast (acute) (chronic) (nonpuerperal)
    • Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
      • nipple
    • Carbuncle
      • breast
    • Furuncle
      • breast
    • Mastitis(acute) (diffuse) (nonpuerperal) (subacute)
      • with abscess
    • Suppuration, suppurative
      • breast
    • Suppuration, suppurative
      • mammary gland
    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • breast

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.

Convert N61.1 to ICD-9-CMHistory

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

ICD-9-CM
611.0 Inflam disease of breast
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement N61.1 replaces the following previously assigned code(s):

  • N61 - Inflammatory disorders of breast
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N61.1Overview

Is N61.1 (Inflammatory disorders of breast) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report abscess of the breast and nipple on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N61.1 group to?

When abscess of the breast and nipple is the principal diagnosis on an inpatient stay, it groups to MS-DRG 600, 601, with relative weights from 0.6050 to 1.0416 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N61.1?

Under the General Equivalence Mappings, abscess of the breast and nipple converts to ICD-9-CM 611.0 (inflam disease of breast). The mapping is approximate, so confirm the match fits the documentation.

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.