N64.9 Disorder of breast, unspecified

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)

• 611.9 Unspecified breast disorder

Diagnosis Index entries for N64.9

• Disease, diseased › breast
• Disease, diseased › nipple
• Disorder (of) › breast
• Mastopathy, mastopathia

Nearby codes

• N64.59 Other signs and symptoms in breast
• N64.8 Other specified disorders of breast
• N64.81 Ptosis of breast
• N64.82 Hypoplasia of breast
• N64.89 Other specified disorders of breast
• N64.9 Disorder of breast, unspecified (this code)