Q77.6 vs Q82.4
Q77.6 and Q82.4 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 Q82.4
Ellis-van Creveld syndrome (Q77.6)
Q77.6
Chondroectodermal dysplasia
Billable
- Chapter 17
- Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
- Section
- Q65-Q79
Use when the record says
- Ellis-van Creveld syndrome
Indexed under
- Chondroectodermal dysplasia
- Ellis-van Creveld syndrome (chondroectodermal dysplasia)
- Disease, diseased › Ellis-van Creveld
- Dysplasia › chondroectodermal
- Syndrome › chondroectodermal dysplasia
Q82.4
Ectodermal dysplasia (anhidrotic)
Billable
- Chapter 17
- Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
- Section
- Q80-Q89
Indexed under
- Basan'sectodermal dysplasia (hidrotic)
- Bason'sectodermal dysplasia (hidrotic)
- Clouston'sectodermal dysplasia (hidrotic)
- Ectodermal dysplasia (anhidrotic)
- Feinmesser'sectodermal dysplasia (hidrotic)
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