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SIGRID GARDNER WILLIAMS M.D.
NPI 1033485511
Obstetrics & Gynecology in Tucson, AZ

Active since March 28, 2012PECOS EnrolledAccepts Medicare Assignment
655 E RIVER RD STE 201, TUCSON, AZ 85704(520) 258-0585(833) 449-2358 Get Directions Write a Review

NPPES record last updated: October 3, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 3, 2024, Sep 13, 2021, Dec 6, 2018 and 1 more (4 updates tracked since 2016).

About Sigrid Gardner Williams M.d. NPPES

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

SIGRID GARDNER WILLIAMS M.D. (NPI 1033485511) is an individual obstetrics & gynecology provider in Tucson, Arizona, licensed in Arizona (57253) and active in the NPI registry since March 2012. She is enrolled in Medicare PECOS, maintains a secondary practice location in Tucson, and is a graduate of University Of Arizona College Of Medicine (2012).

NPPES Registry Identity

NPI1033485511
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameSIGRID GARDNER WILLIAMSCredential: M.D.
Location Address655 E RIVER RD STE 201Tucson, AZ 85704-5824
Mailing AddressPo Box 81064Cleveland, OH 44181-0064
Phone(520) 258-0585
Fax(833) 449-2358
Sole ProprietorNo
Medical School CMSUniversity Of Arizona College Of MedicineGraduated 2012
Enumeration DateMarch 28, 2012
Last NPPES UpdateOctober 3, 20244 updates tracked since enumeration
NPPES CertifiedOctober 3, 2024
✔ NPI 1033485511 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 · 57253
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.
655 E RIVER RD STE 201, Tucson, AZ 85704
Open in Google Maps ↗

Secondary Practice Location 1

Location 14600 S Park Ave Ste 6BTucson, AZ 85714-1697 · Phone (520) 624-6260 · Fax (833) 449-2358

Other Identifiers 2

Medicaid462098AZ
Other57253AZ · Az Medical Board

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of Arizona, Cigna HealthCare of Arizona, Inc, Imperial Insurance Companies, 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

Sigrid Gardner Williams M.d. 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 ID6406136605
PECOS Enrollment IDI20190513000974
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 Sigrid Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Genesis Ob Gyn PLLC
Same address
Obstetrics & Gynecology
655 E RIVER RD UNIT 201
Tucson, AZ 85704
  • Reassigned Medicare billing, Arizona enrollment
  • 157 clinicians in this Medicare group
NPI 1992994214 (520) 258-0585
Banner-University Medical Group
3.4 mi
Nutrition, Education
6261 N LA CHOLLA BLVD STE 131
Tucson, AZ 85741
  • Reassigned Medicare billing, Arizona enrollment
  • 1,514 clinicians in this Medicare group
NPI 1639842677 (520) 694-5437

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 85704 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 5

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

KAITLYN M LUCAS APRN
Nurse Practitioner (Family)
655 E RIVER RD STE 201
TUCSON, AZ 85704
Pima County (520) 258-0585
DR. ANNA CHRISTINE NELSON-MOSEKE MD
Obstetrics & Gynecology
655 E RIVER RD STE 201
TUCSON, AZ 85704
Pima County (520) 258-0585
MELISSA PRUITT FNP-C
Nurse Practitioner (Family)
655 E RIVER RD STE 201
TUCSON, AZ 85704
Pima County (520) 258-0585
DR. RACHEL MARIE WALKER M.D.
Obstetrics & Gynecology
655 E RIVER RD STE 201
TUCSON, AZ 85704
Pima County (520) 258-0585
DR. JANET P WARNER MD
Obstetrics & Gynecology
655 E RIVER RD STE 201
TUCSON, AZ 85704
Pima County (520) 258-0585

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 Sigrid Williams's NPI number?

The NPI number for Sigrid Williams is 1033485511. It was assigned to this individual provider in the NPPES registry on March 28, 2012.

Where is Sigrid Williams located?

Sigrid Williams practices at 655 E River Rd Ste 201, Tucson, AZ 85704. The listed phone number is (520) 258-0585.

What is Sigrid Williams's specialty?

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

Is Sigrid Williams enrolled in Medicare?

Yes. Sigrid Williams 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 Sigrid Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sigrid Williams reassigns Medicare benefits to 2 organizations: Genesis Ob Gyn PLLC (Tucson, AZ) and Banner-University Medical Group (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 Sigrid Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Sigrid Williams accept?

Health plans from Blue Cross Blue Shield of Arizona, Cigna HealthCare of Arizona, Inc, Imperial Insurance Companies, Inc. and Oscar Health Plan, Inc. list Sigrid Williams 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 Sigrid Williams was last updated on October 3, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.