Kimberley Geissler

University of Massachusetts at Amherst
School of Public Health and Health Sciences
715 N Pleasant St
325 Arnold Hall
Amherst, MA 01003

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: University of Massachusetts at Amherst

NBER Working Papers and Publications

February 2018Team Formation and Performance: Evidence from Healthcare Referral Networks
with Leila Agha, Keith Marzilli Ericson, James B. Rebitzer: w24338
How does team-specific capital affect productivity? We examine the teams that primary care physicians (PCPs) assemble when referring patients to specialists. Our theoretical model finds that team-specific capital is greater when PCPs concentrate their referrals within a smaller set of specialists. Empirically, we find patients of PCPs with concentrated referrals have lower healthcare costs, with no discernable reduction in quality. This effect exists for commercially insured and Medicare populations; is statistically and economically significant; and holds under identification strategies that account for unobserved patient and physician characteristics.
September 2017The Impact of Partial-Year Enrollment on the Accuracy of Risk Adjustment Systems: A Framework and Evidence
with Keith Marzilli Ericson, Benjamin Lubin: w23765
Accurate risk adjustment facilitates healthcare market competition. Risk adjustment typically aims to predict annual costs of individuals enrolled in an insurance plan for a full year. However, partial-year enrollment is common and poses a challenge to risk adjustment, since diagnoses are observed with lower probability when individual is observed for a shorter time. Due to missed diagnoses, risk adjustment systems will underpay for partial-year enrollees, as compared to full-year enrollees with similar underlying health status and usage patterns. We derive a new adjustment for partial-year enrollment in which payments are scaled up for partial-year enrollees’ observed diagnoses, which improves upon existing methods. We simulate the role of missed diagnoses using a sample of commercially i...

Published: Keith M. Marzilli Ericson & Kimberley H. Geissler & Benjamin Lubin, 2018. "The Impact of Partial-Year Enrollment on the Accuracy of Risk-Adjustment Systems: A Framework and Evidence," American Journal of Health Economics, vol 4(4), pages 454-00000. citation courtesy of

NBER Videos

National Bureau of Economic Research, 1050 Massachusetts Ave., Cambridge, MA 02138; 617-868-3900; email:

Contact Us