Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Thayer Starr Phelan, MD

Emergency Medicine Physician in Winslow, AZ · enumerated 2007.

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

National Provider Identifier

1821209354

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Registry record

Entity type Individual (Type 1)

Name Thayer Starr Phelan

Credential MD

Sex Female

Practice address 1501 N Williamson Ave, Winslow, AZ, 86047

Phone (928) 289-4691

Enumeration date May 25, 2007

Last updated in NPPES Dec 10, 2025

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 75374 (AZ) Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License DR.0053427 (CO) Primary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 01098090A (IN) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
09892	Medicaid	LA	-

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 Thayer Phelan?

The National Provider Identifier (NPI) for Thayer Phelan is 1821209354, a Type 1 (individual) record in the CMS NPPES registry.

Where does Thayer Phelan practice?

The practice location on file with NPPES is in Winslow, AZ. 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 2025-12-10.