A81.1 vs B05
A81.1 and B05 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 B05
subacute sclerosing panencephalitis (A81.1)
A81.1
Subacute sclerosing panencephalitis
Billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- A80-A89
Use when the record says
- Dawson's inclusion body encephalitis
- Van Bogaert's sclerosing leukoencephalopathy
Indexed under
- Bodechtel-Guttman disease (subacute sclerosing panencephalitis)
- Dawson'sencephalitis (inclusion body)
- Panencephalitis, subacute, sclerosing
- Van Bogaert's leukoencephalopathy (sclerosing) (subacute)
- Disease, diseased › Bodechtel-Guttmann
B05
Measles
Not billable
- Chapter 1
- Certain infectious and parasitic diseases
- Section
- B00-B09
Use when the record says
- morbilli
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