Positive predictive value (PPV) of coded discharge diagnosis definitions for hospitalisations for serious infections among adults >=50 years of age enrolled in Tennessee Medicaid, 2008–2012
| Type | Expected number of records | Records received | PPV (95% CI) |
| Overall | 675 | 716 | 90.2 (87.8 to 92.2) |
| Region-specific | |||
| West | 225 | 195 | 91.3 (86.5 to 94.5) |
| Central | 225 | 225 | 88.9 (84.1 to 92.4) |
| East | 225 | 296 | 90.5 (86.7 to 93.4) |
| Bed volume size specific | |||
| Low | 225 | 230 | 93.9 (90.0 to 96.3) |
| Medium | 225 | 233 | 92.7 (88.6 to 95.4) |
| High | 225 | 253 | 84.6 (79.6 to 88.5) |
| Serious infection | |||
| Pneumonia | 305 | 340 | 96.5 (93.9 to 98.0) |
| Cellulitis/soft-tissue infections | 125 | 123 | 91.1 (84.7 to 94.9) |
| Pyelonephritis | 80 | 89 | 87.6 (79.2 to 93.0) |
| Bacteraemia/sepsis | 100 | 92 | 82.6 (73.6 to 89.0) |
| Septic arthritis/osteomyelitis | 50 | 58 | 75.9 (63.5 to 85.0) |
| Endocarditis | 5 | 4 | 75.0 (30.1 to 95.4) |
| Meningitis/encephalitis | 10 | 10 | 50.0 (23.7 to 76.3) |