N64: Other disorders of breast

Codes under N64 (Other disorders of breast). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
N64.0	Fissure and fistula of nipple	✓
N64.1	Fat necrosis of breast	✓
N64.2	Atrophy of breast	✓
N64.3	Galactorrhea not associated with childbirth	✓
N64.4	Mastodynia	✓
N64.5	Other signs and symptoms in breast	—
N64.8	Other specified disorders of breast	—
N64.9	Disorder of breast, unspecified	✓
N64.51	Induration of breast	✓
N64.52	Nipple discharge	✓
N64.53	Retraction of nipple	✓
N64.59	Other signs and symptoms in breast	✓
N64.81	Ptosis of breast	✓
N64.82	Hypoplasia of breast	✓
N64.89	Other specified disorders of breast	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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