N64.4 – Mastodynia
ICD-10-CM 2027 diagnosis code · Disorders of breast
ICD-10-CM code
N64.4
- Code
N64.4(claims format:N644)- Description
- Mastodynia
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
- Parent codes
- N64
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
N64 – Other disorders of breast
Excludes2 (not included here):
- mechanical complication of breast prosthesis and implant (T85.4-)
Block N60-N65
Index terms for N64.4
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in N64
- 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
- N64.5 – Other signs and symptoms in breastHeader
- N64.8 – Other specified disorders of breastHeader
- N64.9 – Disorder of breast, unspecifiedBillable
Frequently asked questions
What is ICD-10 code N64.4?
N64.4 is the ICD-10-CM code for mastodynia, in the block N60-N65 (Disorders of breast).
Is N64.4 a billable code?
Yes. N64.4 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does N64.4 belong to?
It belongs to category N64 – Other disorders of breast.
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.