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Table 1 ICD9-CM based algorithm for identifying decompressive craniectomy for stroke

From: Validation of an International Classification of Disease, Ninth Revision coding algorithm to identify decompressive craniectomy for stroke

Classification

Code

Definition

Inclusion Criteria

ICD9-CM Diagnosis Codes

433.11

Occlusion & stenosis of the carotid artery, with infarction

 

434.01

Cerebral thrombosis, with infarction

 

434.11

Cerebral embolism, with infarction

 

434.91

Cerebral artery occlusion, unspecified, with infarction

ICD9-CM Procedure Codes

01.24

Craniotomy

 

01.25

Craniectomy

 

01.39

Other incision of brain

 

01.53

Lobectomy of brain

 

01.59

Other excision of lesion or tissue of the brain

Exclusion Criteria

ICD9-CM Diagnosis Codes

191.x

Malignant neoplasm of the brain

 

198.3

Secondary malignant neoplasm of the brain and spinal cord

 

324.0

Intracranial abscess

 

430

Subarachnoid hemorrhage

 

433.01

Occlusion & stenosis of the basilar artery, with infarction

 

433.21

Occlusion & stenosis of the vertebral artery, with infarction

 

437.3

Cerebral aneurysm, unruptured

 

437.5

Moyamoya disease

 

437.6

Intracranial venous sinus thrombosis

 

443.24

Dissection of the vertebral artery

 

747.81

Congenital anomalies of the cerebrovascular system

 

800.xx

Fracture of the vault of the skull

 

801.xx

Fracture of the base of the skull

 

851.xx

Traumatic cerebral contusion

 

852.xx

Traumatic subarachnoid, subdural, or extradural hemorrhage

 

853.xx

Other and unspecified intracranial hemorrhage after injury

 

854.xx

Intracranial injury of other and unspecified nature

ICD9-CM Procedure Codes

03.09

Laminectomy

  1. Abbreviations: ICD9-CM international classification of diseases, ninth revision, clinical modification