N63.4 – Unspecified lump in breast, subareolar
ICD-10-CM 2027 diagnosis code · Disorders of breast
ICD-10-CM code
N63.4
- Code
N63.4(claims format:N634)- Description
- Unspecified lump in breast, subareolar
- 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
- Parent codes
- N63
Billable codes under N63.4
N63.4 is a header code and cannot be used on claims. Choose the most specific code:
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
N63 – Unspecified lump in breast
Applicable to:
- Nodule(s) NOS in breast
Block N60-N65
Related codes in N63
Frequently asked questions
What is ICD-10 code N63.4?
N63.4 is the ICD-10-CM code for unspecified lump in breast, subareolar, in the block N60-N65 (Disorders of breast).
Is N63.4 a billable code?
No. N63.4 is a header code with more specific child codes; report one of the billable codes listed above.
What category does N63.4 belong to?
It belongs to category N63 – Unspecified lump in 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.