Objective: To examine factors that influenced the revenues from Civil Servants Medical Benefit Scheme [CSMBS] of a Thai teaching hospital.

Materials and Methods: Retrospective invoice data were retrieved from the hospital’s database to analyze changes between first half of fiscal year 2016 and 2017 by the Laspeyres index. Effects of price and quantity of existing item, exiting item, and new item were calculated for top six expense types and for total.

Results: CSMBS revenues were about two fifths of total hospital revenues. The revenues were from drug (22.3%) and from inpatient [IP] and outpatient [OP] services (77.1%). The price, quantity, exiting item, new item, and cross effects in IP service were 0.09, 0.88, -2.61, 2.77, and -0.13, while in OP service they were at -0.22, 1.66, -1.07, 0.69, and -0.05, respectively.

Conclusion: By splitting revenues into factors using Laspeyres index, each factor will reflect the increase or decrease of total revenue and allow the administrative team to monitor hospital revenues.

Keywords: Factors, Laspeyres index, Revenues, Hospital