NPI vs. taxonomy code vs. PECOS vs. CLIA

Four identifiers turn up around U.S. providers, and they’re easy to confuse because they often appear together. Each answers a different question.

Identifier	What it is	Issued by	Tells you
NPI	A unique 10-digit provider ID	CMS (NPPES)	Who the provider or organization is
Taxonomy code	A specialty/role classification code	NUCC	What they practice
PECOS	A Medicare enrollment record	CMS	Whether they can bill Medicare
CLIA	A clinical-laboratory certificate	CMS	Whether a lab may test human samples

NPI — the identity

The National Provider Identifier is the anchor. It’s the 10-digit number that uniquely names a provider, and every other record tends to hang off it.

Taxonomy code — the specialty

A NUCC taxonomy code like 207RC0000X classifies what a provider does (here, cardiology). A provider can list several; one is flagged primary. drfind translates these codes into plain-English specialties for you.

PECOS — Medicare enrollment

PECOS (Provider Enrollment, Chain, and Ownership System) records whether a provider is enrolled to bill Medicare. A provider can have an NPI without being enrolled in PECOS.

CLIA — lab certification

A CLIA number certifies a laboratory under the Clinical Laboratory Improvement Amendments. It’s about facilities that run tests, not about clinicians.

Putting it together

For everyday “who is this provider and what do they do,” the NPI and taxonomy are what you need — and you can search both in plain English on drfind. PECOS and CLIA come into play for billing and lab-compliance workflows.