Table 4.
Supplementary Analysis I: Under-Charging for Inpatient Care
| Percentage-Point Effect on Individual’s Likelihood of Being Charged ANYTHING for Their Inpatient Carea (95% Confidence Interval) | Percent Effect on Individual’s Undiscounted Hospital Charge, Excluding Encounters with No Charge (95% Confidence Interval) | |||
|---|---|---|---|---|
| Individual’s Principal Payer: | ||||
| Private Insurance | 0.8 ppt ↑ (0.0ppt to 1.5ppt) | P=0.05 | 1.0% ↑ (0.1% to 1.9%) | P=0.03 |
| Medicare | 0.6 ppt ↑ (−0.1ppt to 1.3ppt) | P=0.09 | 1.1% ↑ (0.2% to 2.0%) | P=0.02 |
| Medicaid | 0.3 ppt ↑ (−0.4ppt to 1.0ppt) | P=0.42 | 0.5% ↓ (−1.3% to 0.3%) | P=0.23 |
| Self-Pay (i.e., uninsured) | ||||
| Reference Category | Reference Category | |||
| Fixed Effect Controls: | ||||
| Sex | Included | Included | ||
| Age (in years) | Included | Included | ||
| Length of Stay (in days) | Included | Included | ||
| Priority of Admission | Included | Included | ||
| Principal Diagnosis | Included | Included | ||
| APR DRG/SOI Combinationb | Included | Included | ||
| Hospital of Admission | Included | Included | ||
|
| ||||
| R-Squared | 0.024 | 0.818 | ||
| Observations | 4,712,790 | 4,704,115 | ||
a
After initially excluding charity cases
b
All Patient Refined Diagnosis Related Group (APR DRG); Severity of Illness (SOI)