Strong candidate
Legal organization name and testing-site address align across NPI Registry and QCOR
Next step: Record the CLIA number, then verify the current QCOR certificate fields
NPI-to-CLIA matching workflow
CLIA lookup by NPI
As of 2026-07-21, a National Provider Identifier (NPI) is not a search field in the public CMS QCOR CLIA directory. To find a CLIA number from an NPI, use the official NPI Registry to confirm the organization's legal name and practice location, then search QCOR by facility name, state, or ZIP and match the testing-site address. Do not assume a one-to-one crosswalk: CMS says a laboratory may share an NPI with another laboratory, physician office, or group practice.
Last verified: 2026-07-21Open official CMS QCOR search
NPI
10 digits
Provider or organization identity in CMS NPPES; not proof of a CLIA certificate.
CLIA number
10 characters
Certificate identifier attached to a laboratory location in the CMS CLIA system.
verify the location
Crosswalk rule
Not one-to-one
Use facility name and testing-site address to reconcile the two records.
Official-source path
How to do a CLIA lookup by NPI using CMS sources
- 1. Resolve the exact NPI. Search the 10-digit identifier in the CMS NPI Registry. Confirm the entity type and capture the legal organization name, primary taxonomy, and every relevant practice address.
- 2. Identify the testing location. An organization may have multiple practice sites, while the CLIA record follows the facility where testing is performed. Select the location tied to the laboratory service, not merely the billing or mailing address.
- 3. Search CMS QCOR. QCOR accepts a facility name or CLIA identification number with state or ZIP filters. Start with the legal name from NPPES, then narrow by the testing-site location.
- 4. Match before recording the CLIA number. Compare the facility name and address across both sources. Once they align, read the CLIA number, certificate type, and expiration date from the current QCOR result and record the date checked.
The location is the bridge
Why the NPI alone is not enough
CMS's current laboratory-payment FAQs say a laboratory may share an NPI with another laboratory or supplier, including a physician office or group practice. The NPI can therefore identify the billing organization without uniquely identifying the certified testing site. A defensible match needs the facility name plus the physical location where testing occurs.
Identifier provenance
NPI versus CLIA number: fields that can reconcile the records
The two identifiers are maintained for different purposes. Use the overlapping identity and location fields below as match evidence; never substitute the NPI for the CLIA certificate number.
| Dimension | NPI Registry record | CLIA / QCOR record |
|---|---|---|
| Format | 10 numeric digits | 10 characters: 2 digits, D, then 7 digits |
| What it identifies | A healthcare provider or organization in NPPES | A certified laboratory location and its CLIA certificate |
| Official public source | CMS NPI Registry | CMS QCOR CLIA Laboratory Lookup |
| Useful match fields | Legal name, entity type, taxonomy, practice address | Facility name, testing address, state, ZIP, certificate type |
| Relationship | May be shared across a lab and another supplier | Assigned to the laboratory location; not a billing NPI |
Match-quality ladder
How much evidence supports the NPI-to-CLIA match?
Needs review
Organization name aligns but suite, city, ZIP, or practice location differs
Next step: Check alternate NPI addresses and additional QCOR results before linking the records
Insufficient
Only a shared brand, owner name, taxonomy, or state aligns
Next step: Do not infer a crosswalk; obtain the testing-site identity from the lab or State Agency
CLIA certificate verification
What to verify after you find the CLIA number
The matched CLIA number is the start of the certificate check, not the decision. Confirm the facility name and testing address, certificate type, expiration date, and QCOR data-source date. CMS describes the public QCOR directory as an active-laboratory list updated weekly, so keep the date of your review with the result.
Site capability
This page is a workflow, not an automated crosswalk
SourceCheckHealth can resolve an NPI record and a CLIA number separately, but it does not currently assert that an NPPES row and an imported CLIA row belong to the same testing site. Use the official source workflow above to reconcile them. SourceCheckHealth does not provide CLIA certification, licensure verification, complete credentialing, or a final compliance decision.
Continue verification
Open each identifier in its own official context
Use the NPI hub for NPPES identity context, the CLIA hub for an exact CLIA-number record, and QCOR for the current public certificate fields.
date_retrieved: 2026-07-21. Sources checked: CMS NPI Registry, CMS QCOR CLIA Laboratory Lookup, CMS Laboratory Demographics Lookup, and CMS Clinical Laboratory Fee Schedule PAMA Reporting FAQs.
Reviewed by SourceCheck Health
Last reviewed: 2026-07-21. date_retrieved: 2026-07-21.
The NPI-to-CLIA matching workflow, public QCOR search fields, identifier relationship, and compliance limits on this page are reviewed against the official CMS NPI Registry, CMS QCOR, and CMS laboratory-payment sources named here before the guidance is updated.
FAQ
Practical notes
Can I look up a CLIA number by NPI?
Not directly in the public CMS QCOR CLIA search. Look up the exact 10-digit NPI in the official NPI Registry, record the organization name and practice location, then search QCOR by facility name, state, and ZIP. Match the address before recording the CLIA number because CMS says a laboratory may share an NPI with another lab or provider organization.
Is a CLIA number the same as an NPI number?
No. An NPI is a 10-digit healthcare-provider identifier issued through NPPES for standard transactions. A CLIA number is a 10-character identifier attached to a laboratory certificate and testing site. The identifiers come from different CMS programs and are not interchangeable.
Does every CLIA laboratory have its own unique NPI?
No. CMS explains that a laboratory can share an NPI with another laboratory or supplier, such as a physician office or group practice. That is why an NPI alone should not be treated as a unique CLIA crosswalk key.
What if the NPI Registry and QCOR addresses do not match?
Treat the result as unresolved. Check alternate NPI practice locations, search QCOR using the facility's legal name with state or ZIP, and confirm the testing-site address. If the identity still conflicts, contact the applicable CLIA State Agency or the laboratory instead of forcing a match.
Does an NPI prove that a laboratory is CLIA certified?
No. The NPI Registry provides public provider identity and taxonomy context; it does not establish a current CLIA certificate. Verify the matched laboratory and its current certificate fields in CMS QCOR before acting.