N62 vs N65.1
N62 and N65.1 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on N62
disproportion of reconstructed breast (N65.1)
N62
Hypertrophy of breast
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N60-N65
Use when the record says
- Gynecomastia
- Hypertrophy of breast NOS
- Massive pubertal hypertrophy of breast
Indexed under
- Gynecomastia
- Mammoplasia
- Mastoplasia, mastoplastia
- Excess, excessive, excessively › development, breast
- Hypertrophy, hypertrophic › breast
N65.1
Disproportion of reconstructed breast
Billable
- Chapter 14
- Diseases of the genitourinary system
- Section
- N60-N65
Use when the record says
- Breast asymmetry between native breast and reconstructed breast
- Disproportion between native breast and reconstructed breast
Indexed under
- Asymmetry › between native and reconstructed breast
- Disproportion › between native and reconstructed breast
- Complication › reconstructed breast › asymmetry between native and reconstructed breast (s) (from) (of)
- Complication › reconstructed breast › disproportion between native and reconstructed breast (s) (from) (of)
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027