D33.0 vs D33.1
D33.0 and D33.1 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 D33.0
benign neoplasm of fourth ventricle (D33.1)
D33.0
Benign neoplasm of brain, supratentorial
Billable
- Chapter 2
- Neoplasms
- Section
- D10-D36
Use when the record says
- Benign neoplasm of cerebral ventricle
- Benign neoplasm of cerebrum
- Benign neoplasm of frontal lobe
- Benign neoplasm of occipital lobe
- Benign neoplasm of parietal lobe
- Benign neoplasm of temporal lobe
Indexed under
- Papilloma › choroid plexus
D33.1
Benign neoplasm of brain, infratentorial
Billable
- Chapter 2
- Neoplasms
- Section
- D10-D36
Use when the record says
- Benign neoplasm of brain stem
- Benign neoplasm of cerebellum
- Benign neoplasm of fourth ventricle
Indexed under
- Papilloma › choroid plexus › fourth ventricle
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