Excludes1 pair
Z57.1 vs Z92.3
Z57.1 and Z92.3 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 Z92.3
occupational exposure to radiation (Z57.1)
Z57.1
Occupational exposure to radiation
Billable
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z55-Z65
Indexed under
- Exposure › occupational › radiation
Z92.3
Personal history of irradiation
Billable
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z77-Z99
Use when the record says
- Personal history of exposure to therapeutic radiation
Indexed under
- History › personal › irradiation
- History › personal › radiation therapy
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