Proportion of Days Covered (PDC) Measure Calculations

Proportion of Days Covered (PDC) measures assess the percentage of patients covered by prescription claims for the same drug or for another drug in the same therapeutic class, within a calendar range. The PDC threshold is the level above which the medication has a reasonable likelihood of achieving the most clinical benefit; clinical evidence provides support for a standard PDC threshold of 80%. The following therapeutic categories are covered by the PDC measures hosted within the EQUIPP platform:

• Non-insulin Diabetes Medications (including biguanides, sulfonylureas, DPP-IV inhibitors, TZDs, incretin mimetics, meglitinides, and SGLT2 Inhibitors)
• Renin Angiotensin System (RAS) Antagonists (including ACE inhibitors, ARBs, and direct renin inhibitors)
• Statins

Patient Attribution: For the PDC measures, the pharmacy who filled the most prescription claims within the target therapeutic category for a specific patient within the calendar range will be assigned responsibility for the patient. All prescription drug claims, regardless of dispensing pharmacy, will be counted towards the patient's PDC threshold.