N63 – Unspecified lump in breast
ICD-10-CM 2027 diagnosis code · Disorders of breast
ICD-10-CM code
N63
- Code
N63(claims format:N63)- Description
- Unspecified lump in 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 N63
N63 is a header code and cannot be used on claims. Choose the most specific code:
- N63.0 – Unspecified lump in unspecified breastBillable
- N63.1 – Unspecified lump in the right breastHeader (more codes below)
- N63.2 – Unspecified lump in the left breastHeader (more codes below)
- N63.3 – Unspecified lump in axillary tailHeader (more codes below)
- N63.4 – Unspecified lump in breast, subareolarHeader (more codes below)
Notes for N63
Applicable to:
- Nodule(s) NOS in breast
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 N63?
N63 is the ICD-10-CM code for unspecified lump in breast, in the block N60-N65 (Disorders of breast).
Is N63 a billable code?
No. N63 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.