D43.1

Billable

Neoplasm of uncertain behavior of brain, infratentorial

HCC Category Mapping

V28HCC 23 — Melanoma and Other Skin Cancers

0.251

V24HCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.150

ESRDHCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.000

RxHCCHCC 22 — Cancer, Other Specified Sites

0.000

What This Code Means

A growth in the lower part of the brain (below the tentorium, a membrane dividing brain regions) that cannot yet be classified as definitely cancer or definitely benign.

Coding Tips

•Infratentorial refers to structures below the tentorium cerebelli (cerebellum and brainstem); ensure this anatomical distinction is documented
•This code is for uncertain behavior lesions; confirmed malignant brain tumors use different C-codes

Clinical Significance

Neoplasms of uncertain behavior in the infratentorial brain involve structures below the tentorium cerebelli, including the cerebellum and brainstem. These tumors are particularly concerning due to their proximity to vital structures and may present with ataxia, cranial nerve deficits, or hydrocephalus from cerebrospinal fluid obstruction.

Documentation Requirements

✓Documentation must specify the infratentorial location (cerebellum or brainstem), supported by neuroimaging.
✓Pathology should describe features that preclude definitive benign or malignant classification.
✓Document any neurological symptoms including gait abnormalities, coordination deficits, or signs of increased intracranial pressure.

Commonly Confused Codes

D43.0 (supratentorial brain) involves structures above the tentorium.D33.1 (benign neoplasm, infratentorial brain) is used when pathology confirms benign behavior.C71.6 (malignant neoplasm of cerebellum) and C71.7 (brainstem) are used for confirmed malignancies.D43.2 (brain, unspecified) should not be used when infratentorial location is documented.

Code Hierarchy

└D43Neoplasm of uncertain behavior of brain and central nervous system └D43.1Neoplasm of uncertain behavior of brain, infratentorial

└D43.1Neoplasm of uncertain behavior of brain, infratentorial