Prescriber

Key facts

Authority set by

State practice acts and licensing boards

Controlled substances

DEA registration under the Controlled Substances Act

Claim identifier

Prescriber NPI on pharmacy and Medicare Part D claims

Public Medicare data

CMS Medicare Part D Prescribers datasets, published annually

What is a prescriber?

Physicians, dentists and podiatrists have long held prescribing authority. Nurse practitioners and physician assistants also prescribe, under conditions that differ by state, and in some states optometrists, pharmacists and other professionals can prescribe within defined limits.

Prescribing authority has two layers. The state license defines which drugs a clinician may prescribe and under what conditions. For controlled substances in Schedules II through V, the clinician also needs a DEA registration in each state where they prescribe, and some states require a separate state controlled substance registration.

How prescriber data is captured

Prescribing leaves a trail in several data sources and rules:

• Pharmacy claims record the prescriber's NPI, linking each fill to a specific clinician.
• The CMS Medicare Part D Prescribers datasets summarize claims and drug costs by prescriber NPI and by drug.
• Part D plans must deny pharmacy claims for prescriptions written by clinicians on the CMS Preclusion List.
• The SUPPORT Act requires controlled substance prescriptions under Part D to be sent electronically, with exceptions set by CMS.

Why prescribers matter

Prescribers are the core audience for pharmaceutical marketing and medical affairs. Commercial teams rank prescribers by volume and growth in a therapy class, find early adopters of new products and track switching between brands, generics and biosimilars.

Compliance and policy teams use prescriber data to flag unusual controlled substance prescribing and to study access, and researchers use it to compare prescribing by specialty and region.

Limitations of prescriber data

Public Medicare prescriber data covers only Part D claims, is released with a lag of about two years, and suppresses counts based on fewer than 11 claims. Drugs administered in hospitals and clinics are billed under other benefits and do not appear as Part D prescriptions, so prescribers of infused and injected therapies can look inactive.