N64.0 Fissure and fistula of nipple

Billable ICD-10-CM code, FY2026.

Applies from N64 Other disorders of breast

Excludes2 (not included here)

• mechanical complication of breast prosthesis and implant (T85.4-)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 611.2 Fissure of nipple (approximate)

Diagnosis Index entries for N64.0

• Cracked nipple
• Fissure, fissured › nipple
• Fistula (cutaneous) › nipple

Nearby codes

• N64 Other disorders of breast
• N64.0 Fissure and fistula of nipple (this code)
• 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