Inflammatory disorders of breast (N61) ICD-10-CM
The N61 code range covers inflammatory disorders of breast with 8 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the N61 Range 8 codes · 6 billable
- N61 Inflammatory disorders of breastNon-billable
- N61.0 Mastitis without abscess
- N61.1 Abscess of the breast and nipple
- N61.2 Granulomatous mastitisNon-billable
- N61.20 Granulomatous mastitis, unspecified breast
- N61.21 Granulomatous mastitis, right breast
- N61.22 Granulomatous mastitis, left breast
- N61.23 Granulomatous mastitis, bilateral breast
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the N61 range.
Granulomatous Mastitis
A rare, benign, inflammatory breast disease occurring in premenopausal women shortly after a recent pregnancy. The origin is unknown but it is commonly mistaken for malignancy and sometimes associated with BREAST FEEDING and the use of ORAL CONTRACEPTIVES.
About the N61 Code Range
The ICD-10 code section N61 covers various inflammatory disorders of the breast, including conditions like mastitis without abscess, breast abscesses, and granulomatous mastitis. These codes help specify different types of breast inflammation based on presence of abscess and breast location.
The ICD-10 code for mastitis without abscess (N61.0) is used for breast infections such as nonpuerperal mastitis, also known by names like actinobacillary mastitis, breast infection, or inflammatory disorder of the breast. For cases involving a pus-filled abscess, N61.1 (Abscess of the breast and nipple) captures chronic or postpartum abscesses, and includes synonyms like subareolar abscess and obstetric breast abscess. Granulomatous mastitis, a rare inflammatory breast condition, has distinct codes N61.20 through N61.23 to indicate laterality—from unspecified to bilateral involvement. These distinctions assist medical coders and healthcare providers in selecting precise codes that reflect the specific inflammatory breast condition, ensuring accurate documentation and communication relevant to breast health problems.
Questions About This Page
How many billable codes are in the N61 range?
Of the 8 codes in this range, 6 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the N61 range classify?
The range classifies inflammatory disorders of breast. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
