Quick answers
- Where does Sigrid G. Williams see patients?
- Medicare's clinician data lists 2 practice locations, including Oro Valley, AZ and Tucson, AZ. Call before your visit to confirm the address.
- What is Sigrid G. Williams's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Sigrid G. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Sigrid G. Williams accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Sigrid G. Williams?
- (520) 545-0573, as listed in official Medicare / NPI Registry data.
- What is Sigrid G. Williams's NPI number?
- 1033485511. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Sigrid G. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1521 E Tangerine Rd, Suite 361Oro Valley, AZ 85755 (520) 545‑0573
- 655 E River Rd, Suite 201Tucson, AZ 85704 (520) 258‑0585
Group practices
Medicare enrollment lists Sigrid G. Williams as a member of this group (CMS data updated 2026-10-02).
- Genesis Ob Gyn PLLC110 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Oro Valley
Clinicians with the same Medicare primary specialty in Oro Valley, AZ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Arizona College Of Medicine |
| Graduation year | 2012 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033485511 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians