Table 1.
Selection Criteria for Brain Tumor Admission Subtypes
| Brain Tumor Subtype | Inclusion Criteria | Subtype-Specific Severity Metrics |
|---|---|---|
| Glioma | Diagnosis: 191.0–191.5, 191.8, 191.9, 225.0, 237.5 | Performance of resection: 01.53, 01.59 |
| Procedure: 01.13, 01.14, 01.53, 01.59 | Malignant status and location within brain: 191.0–191.5, 191.8, 191.9 | |
| Metastasis | Diagnosis: 198.3 | Presence of other extracranial metastasis: 197.0–197.8, 198.0–198.2, 198.5–198.7, 198.81, 198.82, 198.89, 199.0 |
| Procedure: 01.59 | Lung cancer: 162.0–9 | |
| Meningioma | Diagnosis: 225.2, 192.1, 237.6 | Malignant status: 191.1 |
| Procedure: 01.51 | ||
| Vestibular Schwannoma | Diagnosis: 225.1 | Hydrocephalus: 331.3, 331.4 |
| Procedure: 04.01 | Neurofibromatosis diagnosis: 237.7, 237.70–237.72 |
Inclusion criteria were based off of ICD-9 diagnosis and procedure codes. For subtype analysis, each subtype had different severity metrics that were included as confounders in multivariate regression.