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ICD-10 Guide
DiagnosesGlioblastoma Multiforme

Glioblastoma Multiforme

ICD-10 Coding for Glioblastoma Multiforme(C71.0, C71.9)

PRIMARY SPECIALTYNeurology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Glioblastoma Multiforme?
Essential facts and insights about Glioblastoma Multiforme

Key Clinical Considerations:

  • Headaches, seizures, cognitive decline, focal neurological deficits
  • MRI showing irregular mass with necrosis and edema, histopathological confirmation
  • Neurological examination may reveal weakness, sensory loss, or changes in reflexes

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history, imaging results, pathology report, treatment plan
  • ICD-10-CM: C71.9 (Malignant neoplasm of brain, unspecified)
  • Example: 'Patient diagnosed with glioblastoma multiforme based on MRI findings and biopsy results.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding brain tumors, avoid unspecified codes unless necessary
  • Common errors include misclassifying tumor type or stage

Code Exclusions

Important Exclusions

  • Benign brain tumors, metastatic brain tumors
  • C71.0 (Malignant neoplasm of cerebral cortex)

Related ICD-10 Codes

Primary Codes
C71.9
Malignant neoplasm of brain, unspecified
Ancillary Codes
G93.6
R56.9
Differential Codes
D43.0
D43.0
when the behavior of the neoplasm is uncertain.
D43.2
D43.2
when the behavior of the neoplasm is uncertain and location is unspecified.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Neurology

Specialty Applications

  • Adults primarily, but can occur in children
  • Oncology and neurology clinics, hospitals

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Complete patient history, imaging studies, and pathology results are essential.

Billing considerations?

Ensure accurate coding to reflect the complexity and severity of the condition.