The Montana Medicaid Claims data included in-state dual eligible adults aged 18-64 years with ≥2 claims in their respective drug group for hypertension (RASA). Nonadherence calculations included the denominator of a ≥180 days covered during calendar year and the numerator included the number of days covered by the prescription fills during the same time period. Beneficiaries with a proportion of days covered <80% were considered nonadherent.
Unduplicated demographics and claims files for each calendar year were linked by member id. The master file included 12,734 unique records for analysis. 32.8% of records were used to map nonadherence for blood pressure medication.
Seventeen counties (30%) with >5 and <20 records were grouped with neighboring alike counties to produce reliable rates creating seven grouped county regions. Nonadherence county data were classified and mapped using quartiles. Medicaid pharmacies and FQHC pharmacies were geocoded for mapping.
