Thayer Starr Phelan, MD
Emergency Medicine Physician · Winslow, AZ
Thayer Starr Phelan, MD is an emergency medicine physician with a practice address in Winslow, Arizona, and NPI 1821209354, issued on May 25, 2007. Check the license (Arizona 75374, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Thayer Starr Phelan
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- 75374 AZ
DR.0053427 CO
01098090A IN
Self-reported in NPPES; status is on the state search - Practice location
- 1501 N Williamson Ave, Winslow, AZ 86047
- Phone
- (928) 289-4691
- Enumerated
- May 25, 2007
- Record last updated
- Dec 10, 2025
- Medicaid ID
- 09892 LA
- Medicare enrollment
- Enrolled (PECOS I20250120000700); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,494 in Arizona → Look up another NPI →
Also registered at 1501 N Williamson Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ralph Day, MDEmergency Medicine Physician1184648255
- Bryan Feinstein, MDEmergency Medicine Physician1417419771
- Vinicius Knabben, M.D.Emergency Medicine Physician1558718619
- William Kvien, MDEmergency Medicine Physician1235148784
- Dale NortonFamily Nurse Practitioner1205553245
- Caterina Palumbo, MDEmergency Medicine Physician1033557400
Verify Thayer Starr Phelan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 75374Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average emergency medicine physician in 2024
179 Medicare Part D claims for 138 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Cephalexin29 claims
- Prednisone21 claims
- Amoxicillin-Clavulanate Potass16 claims
- Albuterol Sulfate Hfa15 claims
- Doxycycline Hyclate11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 28.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 4 group practices
- Emergency Medicine Services OF Maine LLCPittsfield, ME
- Indiana University Health Southern Indiana Physicians LLCBloomington, IN
- Innova Emergency Medical Associates PCWinslow, AZ
- IU Health Medical Group LLCBloomington, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thayer Starr Phelan among 1,494 emergency medicine physician records in Arizona
Thayer Starr Phelan, MD is one of 1,494 emergency medicine physician records with a practice address in Arizona. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 38% of them.
- NPI issued2007 · 38% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2007 · median 2014 among the 828 with a school on file
- Record last updated2025 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 emergency medicine physician records list a practice address in Winslow
They are 8 of the 259 NPPES records with a practice address in Winslow, and 1,494 emergency medicine physician records in Arizona.
All 1,494 in Arizona → Every provider in Winslow → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Ralph Day, MDWinslow, AZ 860471184648255
- Bryan Feinstein, MDWinslow, AZ 860471417419771
- Vinicius Knabben, M.D.Winslow, AZ 860471558718619
- William Kvien, MDWinslow, AZ 860471235148784
- Caterina Palumbo, MDWinslow, AZ 860471033557400
- Jordan Price, DOWinslow, AZ 860471780179259
- Jason Taylor, DOWinslow, AZ 860471003908195
- Dana Ger, M.D.Williams, AZ 860461780694802
Common questions
What is Thayer Starr Phelan, MD's NPI number?
Thayer Starr Phelan, MD's National Provider Identifier (NPI) is 1821209354, issued on May 25, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thayer Starr Phelan, MD located?
The NPPES record lists a practice address at 1501 N Williamson Ave, Winslow, AZ, 86047. Phone: (928) 289-4691. Providers update this record themselves, so call before visiting.
How can I verify Thayer Starr Phelan, MD's license?
NPPES lists Arizona license number 75374, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thayer Starr Phelan, MD prescribe under Medicare Part D?
In 2024, Thayer Starr Phelan, MD had 179 Medicare Part D claims for 138 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Thayer Starr Phelan, MD's MIPS final score?
The 2023 MIPS final score is 28.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.