1. Home
  2. Directory
  3. Arizona
  4. Phoenix
  5. Pediatrics
  6. NPI Profile

FREDERICK ANTHONY WILLYERD MD
NPI 1255661468
Pediatrics - Pediatric Critical Care Medicine in Phoenix, AZ

Active since January 11, 2010PECOS EnrolledAccepts Medicare Assignment
1919 E THOMAS RD, PHOENIX, AZ 85016(602) 933-1784(602) 933-1785 Get Directions Write a Review

NPPES record last updated: August 18, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Frederick Anthony Willyerd Md NPPES

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

FREDERICK ANTHONY WILLYERD MD (NPI 1255661468) is an individual pediatric critical care medicine provider in Phoenix, Arizona, licensed in Arizona (48044) and active in the NPI registry since January 2010. He is enrolled in Medicare PECOS, maintains a secondary practice location in Tucson, and is a graduate of Creighton University School Of Medicine (2007).

NPPES Registry Identity

NPI1255661468
Entity TypeIndividualMale
Primary Taxonomy2080P0203X
Provider Legal NameFREDERICK ANTHONY WILLYERDCredential: MD
Location Address1919 E THOMAS RDPhoenix, AZ 85016-7710
Mailing Address3200 E Camelback Rd Ste 250Phoenix, AZ 85018-2327 · (602) 933-1814 · Fax (602) 933-1820
Phone(602) 933-1784
Fax(602) 933-1785
Sole ProprietorNo
Medical School CMSCreighton University School Of MedicineGraduated 2007
Enumeration DateJanuary 11, 2010
Last NPPES UpdateAugust 18, 2021
NPPES CertifiedAugust 18, 2021
✔ NPI 1255661468 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric Critical Care MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2080P0203X
License✔ Licensed in AZ · 48044
Definition
A pediatrician expert in advanced life support for children from the term or near-term neonate to the adolescent. This competence extends to the critical care management of life-threatening organ system failure from any cause in both medical and surgical patients and to the support of vital physiological functions. This specialist may have administrative responsibilities for intensive care units and also facilitates patient care among other specialists.
1919 E THOMAS RD, Phoenix, AZ 85016
Open in Google Maps ↗

Secondary Practice Location 1

Location 15301 E Grant RdTucson, AZ 85712-2805 · Phone (520) 324-4156

Other Identifiers 1

Medicaid830523AZ

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter Health, Antidote Health Plan of Arizona, Inc. and more.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

Frederick Anthony Willyerd 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.

PECOS PAC ID9335382621
PECOS Enrollment IDI20130905000920
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 Reassignments

2

Medicare enrollment records show Frederick Willyerd reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Phoenix Children's Hospital
Same address
Pediatrics
1919 E THOMAS RD
Phoenix, AZ 85016
  • Reassigned Medicare billing, Arizona enrollment
  • 1,416 clinicians in this Medicare group
NPI 1922112044 (602) 933-1000
Tmc Medical Network
108 mi
Multi-Specialty
5301 E GRANT RD
Tucson, AZ 85712
  • Reassigned Medicare billing, Arizona enrollment
  • 471 clinicians in this Medicare group
NPI 1750832283 (520) 327-5461

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

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. TIMUR RAGHIB M.D.
Hospitalist
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (602) 933-0777
MRS. MARIA T ESCOBAR CSP, RD
Dietitian, Registered
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (480) 440-2787
DR. AHMAR HUSAIN MD
Anesthesiology (Pediatric Anesthesiology)
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (602) 933-4660
MRS. SOLEE R COWLEY LCSW
Social Worker (Clinical)
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (602) 933-0414
MR. SEAN PATRICK BRADY DO
Anesthesiology (Pediatric Anesthesiology)
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (602) 933-4660
PRIYA PRASHER M.D.
Pediatrics
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (602) 933-1900
DR. AMIT RAJARAM D.O.
Pediatrics
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (602) 933-0198
LAURA GARDNER HAMANT
Pediatrics (Pediatric Gastroenterology)
1919 E THOMAS RD
PHOENIX, AZ 85016
Maricopa County (602) 933-1000

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 Frederick Willyerd's NPI number?

The NPI number for Frederick Willyerd is 1255661468. It was assigned to this individual provider in the NPPES registry on January 11, 2010.

Where is Frederick Willyerd located?

Frederick Willyerd practices at 1919 E Thomas Rd, Phoenix, AZ 85016. The listed phone number is (602) 933-1784.

What is Frederick Willyerd's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Critical Care Medicine, with taxonomy code 2080P0203X.

Is Frederick Willyerd enrolled in Medicare?

Yes. Frederick Willyerd 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 Frederick Willyerd's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Frederick Willyerd reassigns Medicare benefits to 2 organizations: Phoenix Children's Hospital (Phoenix, AZ) and Tmc Medical Network (Tucson, AZ). 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 Frederick Willyerd's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Frederick Willyerd accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Antidote Health Plan of Arizona, Inc., Blue Cross Blue Shield of Arizona and Cigna HealthCare of Arizona, Inc list Frederick Willyerd 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 Frederick Willyerd was last updated on August 18, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.