ICD-10-CM category
N64 Other disorders of breast
N64 is a category, not a billable code. Report one of the 13 complete codes below.
Codes in N64
- N64.0Fissure and fistula of nipple
- N64.1Fat necrosis of breast
- N64.2Atrophy of breast
- N64.3Galactorrhea not associated with childbirth
- N64.4Mastodynia
- N64.51Induration of breast
- N64.52Nipple discharge
- N64.53Retraction of nipple
- N64.59Other signs and symptoms in breast
- N64.81Ptosis of breast
- N64.82Hypoplasia of breast
- N64.89Other specified disorders of breast
- N64.9Disorder of breast, unspecified
Outside the US? N64 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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