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 2027, 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.
Mastitis
INFLAMMATION of the BREAST, or MAMMARY GLAND.
About the N61 Code Range
These conditions involve breast inflammation, including mastitis, an abscess, and granulomatous mastitis.
N61.0 identifies mastitis without an abscess. N61.1 identifies an abscess of the breast or nipple. N61.2 identifies granulomatous mastitis, with further subdivisions for the right breast, left breast, both breasts, or an unspecified breast.
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, 2026 through September 30, 2027. 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 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
