Alphabetic Index FY2027

N64

Other disorders of breast

FY2027Chapter 14: Diseases of the genitourinary system/N60–N65 Disorders of breast

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

N64 is a non-billable ICD-10-CM code category for other disorders of breast. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are 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 and 4 more. Its coding notes include 1 Excludes1 entry and 9 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Also from chapter/block level (1 note)
Inherited from N60–N65 Disorders of breast
  • disorders of breast associated with childbirth (O91-O92)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code
  • mechanical complication of breast prosthesis and implant (T85.4-)
Also from chapter/block level (8 notes)
Inherited from Chapter 14 Diseases of the genitourinary system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

More specific codes under N64 8