| N64 | Other disorders of breast | NON-BILLABLE CODE |
| N64.0 | Fissure and fistula of nipple | BILLABLE CODE |
| N64.1 | Fat necrosis of breast | BILLABLE CODE |
| N64.2 | Atrophy of breast | BILLABLE CODE |
| N64.3 | Galactorrhea not associated with childbirth | BILLABLE CODE |
| N64.5 | Other signs and symptoms in breast | NON-BILLABLE CODE |
| N64.51 | Induration of breast | BILLABLE CODE |
| N64.52 | Nipple discharge | BILLABLE CODE |
| N64.53 | Retraction of nipple | BILLABLE CODE |
| N64.59 | Other signs and symptoms in breast | BILLABLE CODE |
| N64.8 | Other specified disorders of breast | NON-BILLABLE CODE |
| N64.81 | Ptosis of breast | BILLABLE CODE |
| N64.82 | Hypoplasia of breast | BILLABLE CODE |
| N64.89 | Other specified disorders of breast | BILLABLE CODE |
| N64.9 | Disorder of breast, unspecified | BILLABLE CODE |
