C71.9 Malignant neoplasm of brain, unspecified
Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.
Applies from C71 Malignant neoplasm of brain
Excludes1 (never code together)
- malignant neoplasm of cranial nerves (C72.2-C72.5)
- retrobulbar malignant neoplasm (C69.6-)
Risk adjustment (HCC)
- CMS-HCC V28: HCC 20 — Lung and Other Severe Cancers
- CMS-HCC V22: HCC 10 — Lymphoma and Other Cancers
- RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
- ESRD V24: HCC 10
MS-DRG index
Defines the logic of DRG(s) 054-055 in MDC 01.
Approximate ICD-9-CM (GEMs)
191.9 Malignant neoplasm of brain, unspecified
Diagnosis Index entries for C71.9
- Astroblastoma › unspecified site
- Astrocytoma (cystic) › anaplastic › unspecified site
- Astrocytoma (cystic) › fibrillary › unspecified site
- Astrocytoma (cystic) › fibrous › unspecified site
- Astrocytoma (cystic) › gemistocytic › unspecified site
- Astrocytoma (cystic) › juvenile › unspecified site
- Astrocytoma (cystic) › pilocytic › unspecified site
- Astrocytoma (cystic) › piloid › unspecified site
- Astrocytoma (cystic) › protoplasmic › unspecified site
- Astrocytoma (cystic) › unspecified site
- Astroglioma › unspecified site
- Ependymoblastoma › unspecified site
- Ependymoma (epithelial) (malignant) › anaplastic › unspecified site
- Ependymoma (epithelial) (malignant) › unspecified site
- Gemistocytoma › unspecified site
- Glioblastoma (multiforme) › with sarcomatous component › unspecified site
- Glioblastoma (multiforme) › giant cell › unspecified site
- Glioblastoma (multiforme) › unspecified site
- Glioma (malignant) › astrocytic › unspecified site
- Glioma (malignant) › mixed › unspecified site
- Glioma (malignant) › unspecified site
- Gliosarcoma › unspecified site
- Oligoastrocytoma › unspecified site
- Oligodendroblastoma › unspecified site
- Oligodendroglioma › anaplastic type › unspecified site
- Oligodendroglioma › unspecified site
- Sarcoma (of) › monstrocellular › unspecified site
- Spongioblastoma (any type) › unspecified site
- Tumor › neuroectodermal (peripheral) › primitive › unspecified site
- Xanthoastrocytoma › unspecified site
Nearby codes
C71.4 Malignant neoplasm of occipital lobeC71.5 Malignant neoplasm of cerebral ventricleC71.6 Malignant neoplasm of cerebellumC71.7 Malignant neoplasm of brain stemC71.8 Malignant neoplasm of overlapping sites of brainC71.9 Malignant neoplasm of brain, unspecified (this code)