---
title: "Patient Timelines PDC Medication Supply"
slug: "pharm-key-concepts-patient-timelines-pdc-medication-supply"
updated: 2023-05-31T19:38:29Z
published: 2023-05-31T19:38:29Z
canonical: "docs.ursahealth.com/pharm-key-concepts-patient-timelines-pdc-medication-supply"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ursahealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Patient Timelines PDC Medication Supply

## Definition

Patient timeline with one record per period during which the patient is in a medication therapy episode for a PDC medication.

## Purpose

Used in the URSA-PHARM module to avoid double-counting supply when patients are on multiple families of medications within the same PDC category.

## Related objects

- [Outpatient Medication Fills Aggregator for URSA-PHARM Concepts](/v1/docs/pharm-objects-outpatient-medication-fills-aggregator-for-ursa-pharm-concepts)
- [Targeted Medication Fills with Medication Therapy Episodes](/v1/docs/pharm-objects-targeted-medication-fills-with-medication-therapy-episodes)
- [PDC Measure Fills](/v1/docs/pharm-objects-pdc-measure-fills)

## Detailed narrative of logic

1. This logic begins with the PDC Measure Fills synthetic object which is one record per patient - calendar date - ingredient triple for a targeted PDC medication; includes information on the medication therapy episode containing that fill.
2. Next, for each episode in PDC Measure Fills, the distinct count of fills for Oral Antidiabetics, Oral ACEI/ARBs, and Statins are calculated.
3. Finally, the object is collapsed to records containing at least one active (in-supply) medication.