Q03 vs Q05.4
Q03 and Q05.4 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 Q03
hydrocephalus with spina bifida (Q05.0-Q05.4)
Q03
Congenital hydrocephalus
Not billable
- Chapter 17
- Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
- Section
- Q00-Q07
Use when the record says
- hydrocephalus in newborn
Q05.4
Unspecified spina bifida with hydrocephalus
BillableUnspecified
- Chapter 17
- Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
- Section
- Q00-Q07
Indexed under
- Spina bifida › with hydrocephalus NEC (aperta)
- Hydrocephalus › congenital › with spina bifida (acquired) (external) (internal) (malignant) (recurrent)
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