FY2027
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Excludes1 pair

N62 vs N65.1

N62 and N65.1 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

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
  • Complication › reconstructed breast › disproportion between native and reconstructed breast

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