D43.1 Neoplasm of uncertain behavior of brain, infratentorial

Billable ICD-10-CM code, FY2026.

Applicable to

• Neoplasm of uncertain behavior of brain stem
• Neoplasm of uncertain behavior of cerebellum
• Neoplasm of uncertain behavior of fourth ventricle

Applies from D43 Neoplasm of uncertain behavior of brain and central nervous system

Excludes1 (never code together)

• neoplasm of uncertain behavior of peripheral nerves and autonomic nervous system (D48.2)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 23 — Prostate, Breast, and Other Cancers and Tumors
• CMS-HCC V22: HCC 12 — Breast, Prostate, and Other Cancers and Tumors
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 12

MS-DRG index

Defines the logic of DRG(s) 054-055 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 237.5 Neoplasm of uncertain behavior of brain and spinal cord (approximate)

Code annotations containing back-references to D43.1

Back-references to D43.1

• Type 1 Excludes: D43.0 Neoplasm of uncertain behavior of brain, supratentorial ("neoplasm of uncertain behavior of fourth ventricle (D43.1)")

Back-references to D43

• Type 1 Excludes: D49 Neoplasms of unspecified behavior ("neoplasms of uncertain behavior (D37-D44, D48)")

Nearby codes

• D43 Neoplasm of uncertain behavior of brain and central nervous system
• D43.0 Neoplasm of uncertain behavior of brain, supratentorial
• D43.1 Neoplasm of uncertain behavior of brain, infratentorial (this code)
• D43.2 Neoplasm of uncertain behavior of brain, unspecified
• D43.3 Neoplasm of uncertain behavior of cranial nerves
• D43.4 Neoplasm of uncertain behavior of spinal cord
• D43.8 Neoplasm of uncertain behavior of other specified parts of central nervous system
• D43.9 Neoplasm of uncertain behavior of central nervous system, unspecified