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SYLVIA YVONNE SONTHEIMER
NPI 1205412830
Emergency Medicine in Fort Defiance, AZ

Active since March 23, 2021PECOS Enrolled
CORNER OF ROUTE N12 AND N7, FORT DEFIANCE, AZ 86504(928) 729-8000 Get Directions Write a Review

NPPES record last updated: July 29, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jul 29, 2026, Jul 3, 2025, Jul 10, 2021 and 1 more (4 updates tracked since 2021).

About Sylvia Yvonne Sontheimer NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SYLVIA YVONNE SONTHEIMER (NPI 1205412830) is an individual emergency medicine provider in Fort Defiance, Arizona, licensed in Massachusetts (1024315) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1205412830
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameSYLVIA YVONNE SONTHEIMER
Location AddressCORNER OF ROUTE N12 AND N7Fort Defiance, AZ 86504
Mailing AddressPo Box 649Fort Defiance, AZ 86504-0649
Phone(928) 729-8000
Sole ProprietorNo
Enumeration DateMarch 23, 2021
Last NPPES UpdateJuly 29, 20264 updates tracked since enumeration
NPPES CertifiedJuly 29, 2026
✔ NPI 1205412830 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in MA · 1024315
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
CORNER OF ROUTE N12 AND N7, Fort Defiance, AZ 86504
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of Arizona.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Sylvia Yvonne Sontheimer is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Sylvia Sontheimer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

The Fort Defiance Indian Hospital Board, Incorporation
3.8 mi
General Acute Care Hospital
CORNER OF ROUTE N12 & N7
Fort Defiance, AZ 86504
  • Reassigned Medicare billing, Texas enrollment
  • 518 clinicians in this Medicare group
NPI 1477876639 (928) 729-8000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 86504 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$85.89 typical visit price
range $55.44 – $168.60
Typical copayment $21.47 (range $13.86 – $42.15)
Most-billed visit code 99203
Established Patient
$98.00 typical visit price
range $17.72 – $137.41
Typical copayment $24.50 (range $4.43 – $34.35)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ROMULO LAURETA PARUNGAO M.D.
Emergency Medicine
CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8600
CHARLES EATON PAGE
Emergency Medicine
CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8000
JAY S GUIKEMA FNP
Nurse Practitioner (Family)
CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8000
MARIBEL PASTRAN RD, CD
Dietitian, Registered
CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8000
PONY NANCY SOKIRI PA-C
Physician Assistant
CORNER OF ROUTE N12 AND N7, CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8000
SARAH R WILLIAMS PT
Physical Therapist
CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8000
JOHN NORBERT
Family Medicine
CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8000
DR. LINDA BROWN TRUDEL MD
Family Medicine
CORNER OF ROUTE N12 AND N7
FORT DEFIANCE, AZ 86504
Apache County (928) 729-8000

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 Sylvia Sontheimer's NPI number?

The NPI number for Sylvia Sontheimer is 1205412830. It was assigned to this individual provider in the NPPES registry on March 23, 2021.

Where is Sylvia Sontheimer located?

Sylvia Sontheimer practices at Corner Of Route N12 And N7, Fort Defiance, AZ 86504. The listed phone number is (928) 729-8000.

What is Sylvia Sontheimer's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Sylvia Sontheimer enrolled in Medicare?

Yes. Sylvia Sontheimer is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Sylvia Sontheimer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sylvia Sontheimer reassigns Medicare benefits to The Fort Defiance Indian Hospital Board, Incorporation (Fort Defiance, AZ). The 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 Sylvia Sontheimer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Sylvia Sontheimer accept?

Health plans from Blue Cross Blue Shield of Arizona list Sylvia Sontheimer 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.

When was this NPI record last updated?

The NPPES record for Sylvia Sontheimer was last updated on July 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.