Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Lois Thetford, AP-C

Physician Assistant in Seattle, WA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1588774780

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Registry record

Entity type Individual (Type 1)

Name Lois Thetford

Credential AP-C

Sex Female

Practice address 1629 N 45th St, Seattle, WA, 98103

Phone (206) 633-3350

Fax (206) 633-3113

Enumeration date Aug 30, 2006

Last updated in NPPES May 31, 2026

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA10000739 (WA) Primary

Other identifiers

Identifier	Type	State	Issuer
8140543	Medicaid	WA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Lois Thetford?

The National Provider Identifier (NPI) for Lois Thetford is 1588774780, a Type 1 (individual) record in the CMS NPPES registry.

Where does Lois Thetford practice?

The practice location on file with NPPES is in Seattle, WA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-31.