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DR. KRISTIN A WINGFIELD WILLIAMS M.D.
NPI 1790701225
Family Medicine - Sports Medicine in Mill Valley, CA

Active since July 15, 2006Opted out of Medicare · through Jul 1, 2027
20 SUNNYSIDE AVE STE B, MILL VALLEY, CA 94941(415) 322-0230(415) 727-9841 Get Directions Write a Review

NPPES record last updated: January 5, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jan 5, 2025, Jun 20, 2024 (2 updates tracked since 2024).

About Dr. Kristin A Wingfield Williams M.d. NPPES

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

DR. KRISTIN A WINGFIELD WILLIAMS M.D. (NPI 1790701225) is an individual sports medicine provider in Mill Valley, California, licensed in California (A83480) and active in the NPI registry since July 2006. She has opted out of Medicare through July 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1790701225
Entity TypeIndividualFemale
Primary Taxonomy207QS0010X
Provider Legal NameDR. KRISTIN A WINGFIELD WILLIAMSCredential: M.D.
Location Address20 SUNNYSIDE AVE STE BMill Valley, CA 94941-1928
Mailing Address304 Todd WayMill Valley, CA 94941-3442 · (650) 804-2252 · Fax (415) 727-9841
Phone(415) 322-0230
Fax(415) 727-9841
Sole ProprietorYes
Enumeration DateJuly 15, 2006
Last NPPES UpdateJanuary 5, 20252 updates tracked since enumeration
NPPES CertifiedJanuary 5, 2025
✔ NPI 1790701225 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily Medicine · Sports MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207QS0010X
License✔ Licensed in CA · A83480
Definition
A family medicine physician that is trained to be responsible for continuous care in the field of sports medicine, not only for the enhancement of health and fitness, but also for the prevention of injury and illness. A sports medicine physician must have knowledge and experience in the promotion of wellness and the prevention of injury. Knowledge about special areas of medicine such as exercise physiology, biomechanics, nutrition, psychology, physical rehabilitation, epidemiology, physical evaluation, injuries (treatment and prevention and referral practice) and the role of exercise in promoting a healthy lifestyle are essential to the practice of sports medicine. The sports medicine physician requires special education to provide the knowledge to improve the health care of the individual engaged in physical exercise (sports) whether as an individual or in team participation.
20 SUNNYSIDE AVE STE B, Mill Valley, CA 94941
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

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Opted out of Medicare

Dr. Kristin A Wingfield Williams M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from July 1, 2025 through July 1, 2027.

Opt-Out Effective DateJuly 1, 2025
Opt-Out In Effect ThroughJuly 1, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94941 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
$104.67 typical visit price
range $69.07 – $202.63
Typical copayment $26.16 (range $17.26 – $50.65)
Most-billed visit code 99203
Established Patient
$119.61 typical visit price
range $23.44 – $166.64
Typical copayment $29.90 (range $5.86 – $41.66)
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

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

AKASIA SOLEIL BAMIDELE L.AC.
Acupuncturist
20 SUNNYSIDE AVE STE B
MILL VALLEY, CA 94941
Marin County (415) 445-9388

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 Kristin Wingfield Williams's NPI number?

The NPI number for Kristin Wingfield Williams is 1790701225. It was assigned to this individual provider in the NPPES registry on July 15, 2006.

Where is Kristin Wingfield Williams located?

Kristin Wingfield Williams practices at 20 Sunnyside Ave Ste B, Mill Valley, CA 94941. The listed phone number is (415) 322-0230.

What is Kristin Wingfield Williams's specialty?

The primary specialty registered for this NPI is Family Medicine, specializing in Sports Medicine, with taxonomy code 207QS0010X.

Is Kristin Wingfield Williams enrolled in Medicare?

No. Kristin Wingfield Williams has opted out of Medicare through July 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Kristin Wingfield Williams was last updated on January 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.