D33.1 — Benign neoplasm of brain, infratentorial
D33.1 is a billable, specific ICD-10-CM code for benign neoplasm of brain, infratentorial. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Benign neoplasm of brain stem
- Benign neoplasm of cerebellum
- Benign neoplasm of fourth ventricle
Other codes that can never be billed with D33.1
These codes carry an Excludes1 note pointing at D33.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D33.1 alone.
- D33.0Benign neoplasm of brain, supratentorial
Risk adjustment
D33.1 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 23 Prostate, Breast, and Other Cancers and Tumors0.186 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
D33.1 is named in 35 Medicare coverage policies — 35 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A55315Billing and Coding: Proton Beam Therapy
- A56464Billing and Coding: Flow Cytometry
- A56537Billing and Coding: Scanning Computerized Ophthalmic Diagnostic Imaging (SCODI)
- A56551Billing and Coding: Visual Fields Testing
How D33.1 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to D33.1.
- Papilloma›choroid plexus›fourth ventricle
Related codes at this level
Codes that share D33. If D33.1 is not quite right, the correct code is usually one of these.
Questions about D33.1
- Is D33.1 a billable ICD-10-CM code?
- Yes. D33.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does D33.1 sit in the tabular list?
- Neoplasms (C00-D49), in the block Benign neoplasms, except benign neuroendocrine tumors (D10-D36).