Z33.1 vs Z33.3
Z33.1 and Z33.3 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 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)
- Carrierof › gestational, pregnant (suspected)
- Pregnancy › incidental finding (single) (uterine)
- Status › pregnancy, incidental (post)
- State › pregnant › incidental (of)
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 (single) (uterine)
- State › pregnant › gestational carrier (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