Appendix e-1. University HealthSystem Consortium (UHC) database description

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1 Appendix e-1. University HealthSystem Consortium (UHC) database description UHC is an alliance of academic medical centers and their affiliated hospitals. Member institutions have the goal of sharing clinical, financial and operational information to identify best practices for cost effective, high quality medical care. e-1 Extracted patient data is pooled into an administrative database, which can be queried for administrative projects as well as for academic research. The dataset is used across multiple subspecialties. UHC performs internal data integrity and validation procedures to provide feedback to member institutions in order to maximize the quality of the submitted data. Prior studies using UHC data have validated subsets of their data with their own institutional electronic medical record. e-2 There has been one published validation of the dataset demonstrating concordance with patient age, gender, length of stay, 30-day readmission rates, and 30-day mortality. e-3

2 Table e-1. Medicare severity diagnosis-related groups used: Diagnostic Category Intravascular procedure MS-DRG Code Diagnosis 20 Intracranial vascular procedures with principal diagnosis of hemorrhage with MCC 21 Intracranial vascular procedures with principal diagnosis of hemorrhage with CC 22 Intracranial vascular procedures with principal diagnosis of hemorrhage without CC/MCC Spinal cord disorder 52 Spinal disorders and injuries with CC/MCC 53 Spinal disorders and injuries without CC/MCC CNS neoplasm 54 Nervous system neoplasms with MCC 55 Nervous system neoplasm without MCC Neurodegenerative disorder Ataxia and demyelinating disease 56 Degenerative nervous system disorders with MCC 57 Degenerative nervous system disorders without MCC 58 Multiple sclerosis and cerebellar ataxia with MCC 59 Multiple sclerosis and cerebellar ataxia with CC 60 Multiple sclerosis and cerebellar ataxia without CC/MCC Stroke with tpa 61 Acute ischemic stroke with use of thrombolytic agent with MCC 62 Acute ischemic stroke with use of thrombolytic agent with CC 63 Acute ischemic stroke with use of thrombolytic agent without CC/MCC Intracranial hemorrhagic and ischemic stroke without tpa 64 Intracranial hemorrhage or cerebral infarction with MCC 65 Intracranial hemorrhage or cerebral infarction with CC 66 Intracranial hemorrhage or cerebral infarction without CC/MCC Arterial stenosis 67 Nonspecific CVA and precerebral occlusion without infarct with MCC Transient ischemic attack 69 Transient ischemia 68 Nonspecific CVA and precerebral occlusion without infarct without MCC Non-hypertensive encephalopathy 70 Nonspecific cerebrovascular disorders with MCC 71 Nonspecific cerebrovascular disorders with CC 72 Nonspecific cerebrovascular disorders without CC/MCC

3 Peripheral nerve disorder Viral meningitis Hypertensive encephalopathy Nontraumatic coma Traumatic brain injury Miscellaneous disorder of the nervous system including movement disorder, sleep disorder, myopathy and myelopathy Bacterial CNS infection Other non-bacterial CNS infection Seizure 73 Cranial & peripheral nerve disorders with MCC 74 Cranial & peripheral nerve disorders without MCC 75 Viral meningitis with CC/MCC 76 Viral meningitis without CC/MCC 77 Hypertensive encephalopathy with MCC 78 Hypertensive encephalopathy with CC 79 Hypertensive encephalopathy without CC/MCC 80 Nontraumatic stupor and coma with MCC 81 Nontraumatic stupor and coma without MCC 82 Traumatic stupor and coma, coma >1 hr with MCC 83 Traumatic stupor and coma, coma >1 hr with CC 84 Traumatic stupor and coma, coma >1 hr without CC/MCC 85 Traumatic stupor and coma, coma <1 hr with MCC 86 Traumatic stupor and coma, coma <1 hr with CC 87 Traumatic stupor and coma, coma <1 hr without CC/MCC 88 Concussion with MCC 89 Concussion with CC 90 Concussion without CC/MCC 91 Other disorders of nervous system with MCC 92 Other disorders of nervous system with CC 93 Other disorders of nervous system without CC/MCC 94 Bacterial and tuberculous infections of nervous system with MCC 95 Bacterial and tuberculous infections of nervous system with CC 96 Bacterial and tuberculous infections of nervous system without CC/MCC 97 Non-bacterial infections of nervous system except viral meningitis with MCC 98 Non-bacterial infections of nervous system except viral meningitis with CC 99 Non-bacterial infections of nervous system except viral meningitis without CC/MCC 100 Seizures with MCC 101 Seizures with MCC

4 Headache 102 Headaches with MCC 103 Headaches without MCC MS-DRG = Medicare severity diagnosis-related group, MCC = major complication or comorbidity, CC = complication or comorbidity, CNS = central nervous system, tpa = tissue plasminogen activator

5 Table e-2. Classification of insurance category by insurance plan Insurance Category Commercial Medicaid Medicare Other Insurance Type Commercial/Private Health Maintenance Organization Commercial/Private Preferred Provider Organization Commercial/Private Transplant Network Commercial/Private Traditional/Indemnity Commercial/Private NOS Commercial/Private Point-of-Service Commercial/Private International Commercial/Private University Employees Commercial/Private University Students Medicaid Traditional/Indemnity Medicaid/Managed Care Medicaid NOS Medicaid Transplant Network Medicare Traditional/Indemnity Medicare/Managed Care Medicare NOS Medicare Transplant Network Auto Liability Ins. (Unspecified) Unknown NOS Other NOS Military Tri-Care Charity NOS State Assisted Healthcare NOS Military Veterans Administration Auto Insurance Traditional/Indemnity State Assisted Healthcare Traditional/Indemnity County Medically Indigent Services NOS Workers Compensation NOS Auto Insurance Preferred Provider Organization Workers Compensation Traditional/Indemnity State Assisted Healthcare Health Maintenance Organization Auto Insurance Health Maintenance Organization State Assisted Healthcare Prisoners Charity Traditional/Indemnity Workers Compensation Preferred Provider Organization Research NOS County Medically Indigent Services Traditional/Indemnity Title V Maternal & Child Health Traditional/Indemnity Military NOS Workers Compensation Health Maintenance Organization Workers Compensation University Employees Research Traditional/Indemnity Military Transplant Network Workers Compensation Exclusive Provider Organization

6 Self Unknown Health Maintenance Organization Title V Maternal & Child Self-Pay - Uninsured NOS Self-Pay - Cash in Full NOS Self-Pay - Cash in Full International e-references: e-1. About UHC [online]. Available at: Accessed August 6, e-2. Johnston SC. Effect of endovascular services and hospital volume on cerebral aneurysm treatment outcomes. Stroke 2000;31: e-3. Sutton JM, Hayes AJ, Wilson GC, et al. Validation of the University HealthSystem Consortium (UHC) administrative dataset: concordance and discordance with patient-level institutional data. J Surg Res 2014;190: e-4. Centers for Medicare & Medicaid Services. MDC 1 Diseases & Disorders of the Nervous System. Available at: Accessed March 15, 2015

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