N64 – Other disorders of breast
ICD-10-CM 2027 diagnosis code · Disorders of breast
ICD-10-CM code
N64
- Code
N64(claims format:N64)- Description
- Other disorders of breast
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 14. Diseases of the genitourinary system (N00-N99)
- Block
- N60-N65 Disorders of breast
Billable codes under N64
N64 is a header code and cannot be used on claims. Choose the most specific code:
- N64.0 – Fissure and fistula of nippleBillable
- N64.1 – Fat necrosis of breastBillable
- N64.2 – Atrophy of breastBillable
- N64.3 – Galactorrhea not associated with childbirthBillable
- N64.4 – MastodyniaBillable
- N64.5 – Other signs and symptoms in breastHeader (more codes below)
- N64.8 – Other specified disorders of breastHeader (more codes below)
- N64.9 – Disorder of breast, unspecifiedBillable
Notes for N64
Excludes2 (not included here):
- mechanical complication of breast prosthesis and implant (T85.4-)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block N60-N65
Frequently asked questions
What is ICD-10 code N64?
N64 is the ICD-10-CM code for other disorders of breast, in the block N60-N65 (Disorders of breast).
Is N64 a billable code?
No. N64 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.