NPI vs DEA Number vs Medicare PTAN
Healthcare providers are identified by more than one number, and they are easy to confuse. The NPI, the DEA registration number, and the Medicare PTAN each serve a distinct purpose. This guide explains how they differ.
Last updated June 10, 2026
The three identifiers at a glance
| Identifier | Issued by | Used for | Public? |
|---|---|---|---|
| NPI | CMS (NPPES) | All HIPAA transactions across payers | Yes |
| DEA number | U.S. DEA | Prescribing controlled substances | No |
| Medicare PTAN | Medicare (MAC) | Medicare enrollment / billing | No |
NPI — the universal identifier
The NPI is the plan-independent identifier used in essentially every electronic healthcare transaction. It is public via NPPES and is the number this site indexes and searches.
DEA number — for controlled substances
A DEA registration number is issued by the U.S. Drug Enforcement Administration and authorizes a provider to prescribe or handle controlled substances. It is not a general-purpose identifier and is not part of the public NPPES dataset.
Medicare PTAN — for Medicare billing
The Provider Transaction Access Number (PTAN) is a Medicare-specific identifier assigned during Medicare enrollment by a Medicare Administrative Contractor. It is linked to the provider's NPI but is used only within the Medicare program and is not public.
While DEA and PTAN are private, the NPI is public — search for any provider here.
Search the NPI registryFrequently asked questions
No. DEA registration numbers are not part of the public NPPES dataset and are not published here. Only NPI and NPPES public fields are available.
No. The PTAN is a Medicare-specific enrollment identifier linked to the NPI, but the two are separate numbers used for different purposes.
The NPI is the identifier used on HIPAA-standard claims. Medicare also associates the claim with the provider's PTAN behind the scenes, and a DEA number appears only on prescriptions for controlled substances.