2026 ICD-10-CM Diagnosis Code Z85.841Personal history of malignant neoplasm of brain
Z85.841 is a billable ICD-10-CM diagnosis code for personal history of malignant neoplasm of brain. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 826 through 830, 843 through 845. The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Personal history of malignant neoplasm.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z85.841.
Present on Admission (POA)Billing
Z85.841 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- History of astrocytoma of brain
- History of cancer metastatic to brain
- History of cerebral meningioma
- History of ependymoma of brain
- History of glioma of brainstem
- History of malignant meningeal neoplasm
- History of malignant meningioma of meninges of brain
- History of malignant neoplasm of brain
- History of malignant neoplasm of nervous system
- History of medulloblastoma of brain
- History of meningioma
- History of metastatic cancer
- History of oligodendroglioma of brain
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- History
- personal (of) - See Also: History, family (of);
- malignant neoplasm (of) - Z85.9
- brain - Z85.841
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- History
- personal (of)
- malignant neoplasm (of)
- brain
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Tumors
A brain tumor is a growth of abnormal cells in the tissues of the brain. Brain tumors can be benign, with no cancer cells, or malignant, with cancer cells that grow quickly. Some are primary brain tumors, which start in the brain. Others are metastatic, and they start somewhere else in the body and move to the brain.
Read the full article at MedlinePlus
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Convert Z85.841 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z85.841Overview
Is Z85.841 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report personal history of malignant neoplasm of brain on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does Z85.841 group to?
On inpatient claims, personal history of malignant neoplasm of brain maps to MS-DRG 826, 827, 828, 829, 830, 843, 844, 845, with relative weights from 0.8516 to 4.6778 depending on complications. Higher weights mean higher Medicare reimbursement.
Can Z85.841 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because personal history of malignant neoplasm of brain describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z85.841 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for personal history of malignant neoplasm of brain on inpatient claims.
What is the ICD-9 equivalent of Z85.841?
Under the General Equivalence Mappings, personal history of malignant neoplasm of brain converts to ICD-9-CM V10.85 (hx of brain malignancy). The mapping is a direct match.
