THAYER STARR PHELAN MD
NPI 1821209354
Emergency Medicine in Winslow, AZ
About Thayer Starr Phelan Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THAYER STARR PHELAN MD (NPI 1821209354) is an individual emergency medicine provider in Winslow, Arizona, licensed in Colorado (DR.0053427) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS, is affiliated with Jacksonville Memorial Hospital, and maintains a secondary practice location in Bloomington.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Thayer Starr Phelan Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
8Medicare enrollment records show Thayer Phelan reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Trinidad, CO 81082
- Reassigned Medicare billing, Arizona enrollment
- 71 clinicians in this Medicare group
Loveland, CO 80538
- Reassigned Medicare billing, Colorado enrollment
- 111 clinicians in this Medicare group
Fort Collins, CO 80524
- Reassigned Medicare billing, Colorado enrollment
- 108 clinicians in this Medicare group
Jacksonville, IL 62650
- Reassigned Medicare billing, Illinois enrollment
- Also billed through NPI 1235864810 (Illinois)
- 39 clinicians in this Medicare group
Springfield, IL 62781
- Reassigned Medicare billing, Illinois enrollment
- 141 clinicians in this Medicare group
Bloomington, IN 47408
- Reassigned Medicare billing, Indiana enrollment
- 783 clinicians in this Medicare group
Indianapolis, IN 46202
- Reassigned Medicare billing, Indiana enrollment
- 5,212 clinicians in this Medicare group
Ellsworth, ME 04605
- Reassigned Medicare billing, Maine enrollment
- 167 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Jacksonville Memorial Hospital
Critical Access Hospitals · Jacksonville, ILIndiana University Health Bloomington Hospital
Acute Care Hospitals · Bloomington, INIndiana University Health Paoli Hospital
Critical Access Hospitals · Paoli, INIndiana University Health Bedford Hospital
Critical Access Hospitals · Bedford, INPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 86047 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 14
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WINSLOW, AZ 86047
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Thayer Phelan's NPI number?
The NPI number for Thayer Phelan is 1821209354. It was assigned to this individual provider in the NPPES registry on May 25, 2007.
Where is Thayer Phelan located?
Thayer Phelan practices at 1501 N Williamson Ave, Winslow, AZ 86047. The listed phone number is (928) 289-4691.
What is Thayer Phelan's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Thayer Phelan enrolled in Medicare?
Yes. Thayer Phelan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Thayer Phelan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thayer Phelan reassigns Medicare benefits to 8 organizations: Innova Emergency Medical Associates PC (Trinidad, CO), Emergency Professionals Of Colorado, PC (Loveland, CO), Vmd Primary Providers Colorado, Inc (Fort Collins, CO), Passavant Memorial Area Hospital Association (Jacksonville, IL), Midwest Emergency Department Specialists Ltd (Springfield, IL) and 3 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Thayer Phelan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Thayer Phelan accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross Blue Shield of Arizona and CareSource list Thayer Phelan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Thayer Phelan affiliated with any hospitals?
According to CMS data, Thayer Phelan is affiliated with Jacksonville Memorial Hospital, Indiana University Health Bloomington Hospital, Indiana University Health Paoli Hospital and Indiana University Health Bedford Hospital.
When was this NPI record last updated?
The NPPES record for Thayer Phelan was last updated on December 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Thayer Starr Phelan, MD · NPI 1821209354
Emergency Medicine physician in Winslow, Arizona. Individual provider, active in the CMS NPPES registry since May 25, 2007.
## Identity
- **NPI:** 1821209354 (Entity type: Individual)
- **Enumerated:** May 25, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** DR.0053427 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 1501 N WILLIAMSON AVE, Winslow, AZ 86047-2735
- **Phone:** (928) 289-4691
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Innova Emergency Medical Associates PC (NPI 1295178978, Trinidad, CO); Emergency Professionals Of Colorado, PC (NPI 1396496469, Loveland, CO); Vmd Primary Providers Colorado, Inc (NPI 1275646614, Fort Collins, CO); Passavant Memorial Area Hospital Association (NPI 1174580831, Jacksonville, IL); Midwest Emergency Department Specialists Ltd (NPI 1245263367, Springfield, IL); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2007
## Record status
- **NPPES last updated:** December 10, 2025
- **Other identifiers:** Medicaid 09892 (LA)
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Source: [NPI Profile](https://npiprofile.com/npi/1821209354) · Data from the CMS NPPES public registry.