CMS Part D × NPPES
Prescriber Lookup
Every US prescriber is in the NPPES provider directory, and Medicare publishes what they prescribed. Put the two together and you can look up a prescriber by name and see their specialty, location, and what they write most in Part D.
Try
The signal
What a prescriber tells you
Two public records describe every prescriber in the country. The NPPES provider directory says who they are — name, specialty (taxonomy), and practice location. Medicare's Part D 'Prescribers by Provider and Drug' file says what they wrote — the drugs and claim counts filed under their NPI. This tool joins the two, so you can search a prescriber by name and read both at once.
Search by last name (or first + last), optionally narrowed by state and specialty, or paste an exact 10-digit NPI. You'll see the prescriber, their specialty, city, and state, the single drug they wrote the most Part D claims for, their total Part D claims for the latest year, how many distinct drugs they wrote, and which tracked therapeutic classes — GLP-1, SGLT2, DPP-4, statins — appear in their record, including whether they entered any of those classes for the first time this year. Every field is free, with no email or login — this is public CMS and NPPES data.
It's a signal, not just a directory, because prescribing changes. A prescriber newly writing a drug class is a dated 'they just started' marker — the read pharma field teams, specialty pharmacies, and device and diagnostics reps use to find who to detail, keyed to what the public Part D file actually shows.
Why it matters
The prescriber's own public record — who they are and what they write in Medicare Part D — in one lookup, so a rep can qualify a name against real prescribing instead of a bought list.
Field guide
How to read the results
Every field below is returned free, in full — no email, no gate. Build a Parse when you want the whole list for a specialty or state, exports, or a live alert the moment a prescriber goes new-to-class.
- Prescriber
- The provider's name as filed in NPPES, the national directory every US prescriber is enrolled in.
- Specialty
- The NPPES taxonomy the prescriber files under — endocrinology, cardiology, nurse practitioner, and so on.
- City / State
- The practice location on the NPPES record; detailing and territory coverage are geographic.
- Top Part D drug
- The single drug this NPI wrote the most Medicare Part D claims for in the latest year — the clearest one-field read on what they prescribe.
- Total claims & distinct drugs
- Latest-year Part D claim volume and how many different drugs they wrote — the size and breadth of the prescribing record.
- Tracked drug classes
- Which of GLP-1, SGLT2, DPP-4, or statin the prescriber writes, and whether they're new to any of those classes this year.
Who uses it
Common use cases
Pharma & specialty-pharmacy field sales
Qualify a prescriber by name against their actual Part D prescribing — specialty, top drug, and which tracked classes they write — before a detailing visit.
New-to-class targeting
A prescriber who entered a class like GLP-1 for the first time this year is a dated adoption signal to reach while the switch is fresh.
Medical device & diagnostics
Confirm a physician's specialty and prescribing footprint from the public record when building a call list.
Market & territory research
Read who prescribes what in a state or specialty straight from CMS + NPPES, without buying a contact list.
Terms
Related terms & acronyms
Plain-language definitions for the language on this record — part of the ParseData glossary.
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FAQ
Frequently asked questions
What data is this?
Two public federal records: the NPPES provider directory (who the prescriber is) and Medicare Part D's Prescribers by Provider and Drug file (what they wrote). This tool joins them by NPI so you can look a prescriber up by name.
Can I search by NPI too?
Yes. Paste an exact 10-digit National Provider Identifier for a direct lookup, or type a name (last, or first + last) to search the directory. You can narrow a name search by state and specialty.
Is the prescriber lookup free?
Yes — fully. Search by name or NPI with no login or email and see every field: prescriber, specialty, city, state, top Part D drug, total claims, distinct drugs, and the tracked drug classes. It's public CMS and NPPES data, so there's no reason to gate it. A Parse adds the whole list for a specialty or state, exports, and live new-to-class alerts.
Why do some prescribers show no Part D activity?
Not every provider in NPPES has Medicare Part D prescribing published — someone may not prescribe under Part D, or their volume may fall below CMS's reporting threshold. The record simply reflects what CMS published, and a blank means no Part D activity was on file, not that they don't prescribe.
How current is it?
Part D is an annual federal release; the tool reads the latest loaded program year, and NPPES identity is refreshed on ParseData's schedule.
How it's sourced
Reads the public NPPES provider directory and CMS Medicare Part D Prescribers by Provider and Drug (public-domain federal records). Identity and prescribing-count fields only, reported exactly as published — provider-level program data, not a consumer report, and never a clinical judgment or a basis for any FCRA-regulated eligibility decision.
Turn this lookup into a live feed.
The free tool gives you every field, in full, off the same CMS Part D × NPPES data behind ParseData. Build a Parse to monitor a whole specialty or state — and get every new-to-class prescriber the moment they hit the record.