Trends in Medicare Service Volume for Cataract Surgery and the Impact of the Medicare Physician Fee Schedule
研究了2005-2009年间Medicare支付变化与复杂及非复杂白内障手术服务量的关系，发现支付减少导致复杂手术量显著增加，而非复杂手术量变化不显著。
OBJECTIVE: To calculate the associations between Medicare payment and service volume for complex and noncomplex cataract surgeries. DATA SOURCES: The 2005-2009 CMS Part B National Summary Data Files, CMS Part B Carrier Summary Data Files, and the Medicare Physician Fee Schedule. STUDY DESIGN: Conducting a retrospective, longitudinal analysis using a fixed-effects model of Medicare Part B carriers representing all 50 states and the District of Columbia from 2005 to 2009, we calculated the Medicare payment-service volume elasticities for noncomplex (CPT 66984) and complex (CPT 66982) cataract surgeries. DATA EXTRACTION: Service volume data were extracted from the CMS Part B National Summary and Carrier Summary Data Files. Payment data were extracted from the Medicare Physician Fee Schedule. PRINCIPAL FINDINGS: From 2005 to 2009, the proportion of total cataract services billed as complex increased from 3.2 to 6.7 percent. Every 1 percent decrease in Medicare payment was associated with a nonsignificant change in noncomplex cataract service volume (elasticity = 0.15, 95 percent CI [-0.09, 0.38]) but a statistically significant increase in complex cataract service volume (elasticity = -1.12, 95 percent CI [-1.60, -0.63]). CONCLUSIONS: Reduced Medicare payment was associated with a significant increase in complex cataract service volume but not in noncomplex cataract service volume, resulting in a shift toward performing a greater proportion of complex cataract surgeries from 2005 to 2009.