I63.521

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

• •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

ICD-9-CM equivalent

Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.

• 43491Approximate match

Associated MS-DRGs

I63.521 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.

Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.

• DRG 023Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
• DRG 024Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
• DRG 061Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with MCC
• DRG 062Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with CC
• DRG 063Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent without CC/MCC
• DRG 064Intracranial Hemorrhage or Cerebral Infarction with MCC
• DRG 065Intracranial Hemorrhage or Cerebral Infarction with CC or tPA in 24 Hours
• DRG 066Intracranial Hemorrhage or Cerebral Infarction without CC/MCC