Go to content

Concordance between discharge prescriptions and insurance claims in post-myocardial infarction patients


Purpose — To assess the degree of concordance between the information (drug quantity, days' supply, and daily dose) recorded on hospital discharge prescriptions and what appears in a public drug insurance electronic claims database.

Methods — A retrospective chart audit of hospital discharge prescriptions with linkage to a prescription claims database was conducted. Three hundred and forty-five post-myocardial infarction patients discharged from an Ontario university-affiliated teaching hospital were included. The percentage of linkable records with perfect agreement between the written prescription and the insurance claim was our measure of concordance.

Results — Seventy-seven per cent and 82% of discharge prescriptions were filled within 7 days, and 120 days post-discharge, respectively. Of those dispensed and that contained adequate information, concordance was perfect for days' supply, quantity, and daily dose for 70.7% (95%CI 67.9–73.4%), 65.9% (95%CI 63.2–68.7%), and 75.9% (95%CI 73.2–78.6%) of prescriptions, respectively. For cardiac drugs, which comprised the majority of filled prescriptions, concordance was greater for daily dose and days' supply than for quantity (75.7% [95%CI 72.7–78.6%] and 75.5% [95%CI 72.6–78.4%] vs. 65.3% [95%CI 62.3–68.4%]). Concordance varied by medication type.

Conclusion — Most hospital discharge prescriptions were filled within 1 week. Among the data elements studied, concordance between written prescriptions and insurance claims was greatest for daily dose. Concordance was greater for scheduled cardiac medications than for other medications.



Jackevicius CA, Paterson JM, Naglie G. Pharmacoepidemiol Drug Saf. 2007; 16(2):207-15.

Contributing ICES Scientists

Associated Sites