2024 ICD-10-CM Diagnosis Code N61.0

Mastitis without abscess

ICD-10-CM Code:
Short Description:
Mastitis without abscess
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Diseases of the genitourinary system
    • Disorders of breast
      • Inflammatory disorders of breast

N61.0 is a billable diagnosis code used to specify a medical diagnosis of mastitis without abscess. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Actinobacillary mastitis
  • Actinobacillus infection
  • Acute adolescent mastitis
  • Acute mastitis
  • Acute non-puerperal breast abscess
  • Acute non-puerperal mastitis
  • Adolescent mastitis
  • Arcanobacterial mastitis
  • Breast infection
  • Cellulitis of breast
  • Cellulitis of pectoral region
  • Coliform mastitis
  • Corynebacterial mastitis
  • Galactophoritis
  • Infected gland of Montgomery
  • Infection due to Arcanobacterium pyogenes
  • Infective mastitis
  • Inflammation of gland of Montgomery
  • Inflammatory disorder of breast
  • Mastitis - obstetric
  • Mastitis of mumps
  • Mycoplasma mastitis
  • Nipple infection
  • Nonpuerperal abscess of areola
  • Nonpuerperal abscess of breast
  • Nonpuerperal mastitis
  • Nonpuerperal mastitis
  • Nonpuerperal mastitis
  • Nonpuerperal mastitis of left breast
  • Nonpuerperal mastitis of right breast
  • Obstetric breast infections
  • Pseudomonas aeruginosa mastitis
  • Retromammary mastitis
  • Staphylococcal mastitis
  • Subacute mastitis
  • Subacute non-puerperal mastitis
  • Subareolar mastitis
  • Thelitis
  • Ulcer of nipple
  • Ulceration of breast

Clinical Classification

Clinical Category:
Nonmalignant breast conditions
CCSR Category Code:
Inpatient Default CCSR:
Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.
Outpatient Default CCSR:
Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Infective mastitis (acute) (nonpuerperal) (subacute)
  • Mastitis (acute) (nonpuerperal) (subacute) NOS
  • Cellulitis (acute) (nonpuerperal) (subacute) of breast NOS
  • Cellulitis (acute) (nonpuerperal) (subacute) of nipple NOS

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Replacement Code

N610 replaces the following previously assigned ICD-10-CM code(s):

  • N61 - Inflammatory disorders of breast

Convert N61.0 to ICD-9-CM

  • ICD-9-CM Code: 611.0 - Inflam disease of breast
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education

Breast Diseases

Most women experience breast changes at some time. Your age, hormone levels, and medicines you take may cause lumps, bumps, and discharges (fluids that are not breast milk).

If you have a breast lump, pain, discharge or skin irritation, see your health care provider. Minor and serious breast problems have similar symptoms. Although many women fear cancer, most breast problems are not cancer.

Some common breast changes are:

  • Fibrocystic breast changes - lumpiness, thickening and swelling, often just before a woman's period
  • Cysts - fluid-filled lumps
  • Fibroadenomas - solid, round, rubbery lumps that move easily when pushed, occurring most in younger women
  • Intraductal papillomas - growths similar to warts near the nipple
  • Blocked milk ducts
  • Milk production when a woman is not breastfeeding

NIH: National Cancer Institute

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018


[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.