FY2027
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Excludes1 pair

Z41.1 vs Z44.3-

Z41.1 and Z44.3 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 Z44.3
encounter for initial breast implant insertion for cosmetic breast augmentation (Z41.1)
Z41.1

Encounter for cosmetic surgery

Billable
Chapter 21
Factors influencing health status and contact with health services
Section
Z40-Z53
Use when the record says
  • Encounter for cosmetic breast implant
  • Encounter for cosmetic procedure
Indexed under
  • Admission › breast augmentation or reduction
  • Admission › cosmetic surgery NEC
  • Admission › plastic surgery, cosmetic NEC
  • Encounter › breast augmentation or reduction
Z44.3

Encounter for fitting and adjustment of external breast prosthesis

Not billable
Chapter 21
Factors influencing health status and contact with health services
Section
Z40-Z53
Indexed under
  • Admission › fitting › breast prosthesis (external)
  • Fitting › artificial › breast
  • Fitting › prosthesis › breast
  • Admission › adjustment › breast › prosthesis (external)
  • Admission › adjustment › prosthesis › 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