N64.9
Disorder of breast, unspecified
BillableComplete code, valid to report
N64.9 (also written N649) is a billable ICD-10-CM diagnosis code for disorder of breast, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 13 codes in category N64 (Other disorders of breast). The Alphabetic Index lists it under 4 entries. 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.
Inherited from N64 Other disorders of breast
- 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)
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 4 entries