Volume 45 | Number 6p2 | December 2010

Abstract List

Alyna T. Chien M.D., M.S., Zhonghe Li, Meredith B. Rosenthal Ph.D.


To evaluate the impact of a “piece‐rate” pay‐for‐performance (P4P) program aimed at rewarding up‐to‐date immunization delivery to 2‐year‐olds according to the recommended series.

Data Sources/Study Setting

Plan‐level data from New York State's Quality Assurance Reporting Requirement and claims data from Hudson Health Plan for 2003–2007. In 2003 Hudson Health Plan, a not‐for‐profit Medicaid‐focused managed care plan, introduced a U.S.$200 bonus payment for each fully immunized 2‐year‐old and provided administrative supports for identifying children who may need immunization. This represented a potential bonus of 15–25 percent above base reimbursement for eligible 2‐year‐olds.

Study Design

Case‐comparison and interrupted times series.

Principal Findings

Immunization rates within Hudson Health Plan rose at a significantly, albeit modestly, higher rate than the robust secular trend noted among comparison health plans. Supplementary analyses suggest that there was no significant change in preexisting disparities during the study period, and that children with chronic conditions have significantly greater odds of being fully immunized during the entire study period.


This study suggests that a piece‐rate P4P program with appropriate administrative supports can be effective at improving childhood immunization rates.