N61.21 Granulomatous mastitis, right breast

Billable ICD-10-CM code, FY2026.

Applies from N61 Inflammatory disorders of breast

Excludes1 (never code together)

• 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)

MS-DRG index

Defines the logic of DRG(s) 600-601 in MDC 09.

Nearby codes

• N61 Inflammatory disorders of breast
• N61.0 Mastitis without abscess
• N61.1 Abscess of the breast and nipple
• N61.2 Granulomatous mastitis
• N61.20 Granulomatous mastitis, unspecified breast
• N61.21 Granulomatous mastitis, right breast (this code)
• N61.22 Granulomatous mastitis, left breast
• N61.23 Granulomatous mastitis, bilateral breast