Excludes1 pair
Z33.1 vs Z33.3
Z33.1 and Z33.3 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 Z33.1
pregnant state, gestational carrier (Z33.3)
Z33.1
Pregnant state, incidental
Billable
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z30-Z39
Use when the record says
- Pregnancy NOS
- Pregnant state NOS
Indexed under
- Pregnancy (single) (uterine)
- Carrier of › gestational, pregnant
- Pregnancy › incidental finding
- Status › pregnancy, incidental
- State › pregnant › incidental
Z33.3
Pregnant state, gestational carrier
Billable
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z30-Z39
Indexed under
- Pregnancy › gestational carrier
- State › pregnant › gestational carrier
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