Supplementary Table 1.
International Classification of Diseases, 9th revision and International Classification of Diseases, 10th revision codes for variables
| Variables | ICD-9 | ICD-10 |
|---|---|---|
| AIS | 436, 433.01, 433.11, 433.21, 433.31, 433.81,433.91, 434.01, 434.11, 434.91 | I63.0, I63.1, I63.2, I63.3, I63.4, I63.5, I63.6, I63.8, I63.9 |
| ICH (including IPH and SAH) | 431, 430, 432.9 | I60, I61, I62.9 |
| IVT | 991.0, V45.88 | Z92.82, 3E03317 |
| MT | 39.74 | 03CP3, 03CQ3, 03CL3, 03CK3, 03CG3 |
| Percutaneous endoscopic gastrostomy | 43.11-43.19 | 0DH64UZ, 0DH63UZ |
| Tracheostomy | 31.10, 31.20, 31.21, or 31.29 | 0B114, 0B113 |
| Decompressive craniectomy | 01.24, 01.25, 01.39, 01.53, 01.59, 02.02 | 0WC1, 0WH1, 0WW1, 0WP1, 0WJ1, 0WH1, 0W91, 0NW0, 0NP0, 0NH0, 0N80, 00W0, 00J0, 0N50, 0NB0, 0090, 00C0, 00H0, 00P0, 00W0, 00B7, 0050, 00B0, 0NS0 |
| Cerebral edema | 348.5, 348.4 | G93.5, G93.6 |
| Hydrocephalus | 331.4 | G91.1, G91.4, G91.8, G91.9 |
| Carotid endarterectomy | 38.12 | 03CK, 03CL |
| Carotid angioplasty/stent placement | 00.63, 00.64 | 037K3, 037K4, 037L3, 037L4 |
| Intracranial angioplasty/stent placement | 00.62, 00.65 | 037G3, 037G4 |
| Postprocedure stroke | 997.02 | I97.821, I97.811 |
| Anticoagulants | V58.61 | Z79.01 |
| Anti-thrombotics | V58.63, V58.66 | Z79.02, Z79.82 |
| Smoking | V15.82, 305.1 | Z87.891, F17 |
| Atrial fibrillation | 427.31, 427.32 | I48 |
| Dyslipidemia | CCS 53 | CCS 53 |
| Cm_Chf, Cm_Perivasc, Cm_Valve, Cm_Drug, Cm_Alcohol, Cm_Htn_C, Cm_Obese, Cm_Liver, Cm_Renlfail, Cm_Hypothy, Cm_Dmcx, and Cm_Dm | Comorbidity measures are assigned using the AHRQ comorbidity software. The AHRQ comorbidity measures identify coexisting medical conditions that are not directly related to the principal diagnosis, or the main reason for admission, and are likely to have originated prior to the hospital stay. Comorbidities are identified using ICD-9-CM diagnoses and the DRG in effect on the discharge date. Derived from https://www.hcup-us.ahrq.gov/tools_software.jsp | |
| APR-DRG | APR-DRGs are assigned using software developed by 3m health information systems. This severity measure includes the base APR-DRG, the severity of illness subclass, and the risk of mortality subclass within each base APR-DRG. Derived from https://www.hcup-us.ahrq.gov/db/vars/aprdrg/nisnote.jsp | |
The CCS for ICD-9-CM is based on the ICD-9-CM, which is a uniform and standardized coding system. The ICD-9-CM’s multitude >14,000 diagnosis codes and >3900 procedure codes are collapsed into a smaller number of clinically meaningful categories. These are generally more useful for presenting descriptive statistics. Derived from https://www.hcup-us.ahrq.gov/toolssoftware/ccs/ccs.jsp. AIS: Acute ischemic stroke, DRG: Diagnosis-related group, CCS: Clinical Classifications Software, ICD: International Classification of Diseases, ICD-9-CM: ICD, 9th Revision, clinical modification, ICH: Intracerebral hemorrhage, IPH: Intraparenchymal hemorrhage, SAH: Subarachnoid hemorrhage, IVT: Intravenous thrombolysis, MT: Mechanical thrombectomy, APR-DRG: All patient refined-DRG, AHRQ: Agency for healthcare research and quality