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AMY JO WILLIAMSON MD
NPI 1881656973
Obstetrics & Gynecology in Phoenix, AZ

Active since April 04, 2006PECOS EnrolledAccepts Medicare Assignment
1919 E THOMAS RD, PHOENIX, AZ 85016(602) 933-2728(602) 933-4292 Get Directions Write a Review

NPPES record last updated: December 11, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Dec 11, 2024, Mar 17, 2018, Sep 13, 2017 (3 updates tracked since 2017).

About Amy Jo Williamson Md NPPES

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

AMY JO WILLIAMSON MD (NPI 1881656973) is an individual obstetrics & gynecology provider in Phoenix, Arizona, licensed in Arizona (24664) and active in the NPI registry since April 2006. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (1994).

NPPES Registry Identity

NPI1881656973
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameAMY JO WILLIAMSONCredential: 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) 933-2728
Fax(602) 933-4292
Sole ProprietorNo
Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 1994
Enumeration DateApril 4, 2006
Last NPPES UpdateDecember 11, 20243 updates tracked since enumeration
NPPES CertifiedDecember 11, 2024
✔ NPI 1881656973 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in AZ · 24664
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
1919 E THOMAS RD, Phoenix, AZ 85016
Open in Google Maps ↗

Secondary Practice Locations 3

Location 116611 South 40th Street, Suite 180Phoenix, AZ 85048-0566 · Phone (480) 785-2100 · Fax (480) 290-7980
Location 2500 W Thomas Rd, Ste 720&Ste 730Phoenix, AZ 85013 · Phone (602) 406-3715 · Fax (602) 406-4011
Location 33210 Grand AvePhoenix, AZ 85017-4504 · Phone (602) 406-3715 · Fax (602) 406-4011

Other Identifiers 1

Medicaid429664AZ

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cigna HealthCare of Arizona, Inc.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

Amy Jo Williamson 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 ID7911191440
PECOS Enrollment IDI20101028001335
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 Amy Williamson 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
Sjhmc Physician Services
2.3 mi
Multi-Specialty
350 W THOMAS RD
Phoenix, AZ 85013
  • Reassigned Medicare billing, Arizona enrollment
  • 773 clinicians in this Medicare group
NPI 1326098005 (602) 406-3729

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 85016 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
$127.71 typical visit price
range $55.44 – $168.60
Typical copayment $31.92 (range $13.86 – $42.15)
Most-billed visit code 99204
Established Patient
$69.24 typical visit price
range $17.72 – $137.41
Typical copayment $17.31 (range $4.43 – $34.35)
Most-billed visit code 99213
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. 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 Amy Williamson's NPI number?

The NPI number for Amy Williamson is 1881656973. It was assigned to this individual provider in the NPPES registry on April 4, 2006.

Where is Amy Williamson located?

Amy Williamson practices at 1919 E Thomas Rd, Phoenix, AZ 85016. The listed phone number is (602) 933-2728.

What is Amy Williamson's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Amy Williamson enrolled in Medicare?

Yes. Amy Williamson 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 Amy Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Amy Williamson reassigns Medicare benefits to 2 organizations: Phoenix Children's Hospital (Phoenix, AZ) and Sjhmc Physician Services (Phoenix, 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 Amy Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Amy Williamson accept?

Health plans from Cigna HealthCare of Arizona, Inc list Amy Williamson 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 Amy Williamson was last updated on December 11, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.