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DR. KATHERINE WILLIAMS M.D.
NPI 1710371463
Internal Medicine in Saint Helena, CA

Active since March 20, 2015PECOS Enrolled
2800 ST. HELENA HIGHWAY NORTH, SAINT HELENA, CA 94574(707) 758-5936 Get Directions Write a Review

NPPES record last updated: March 20, 2015. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Katherine Williams M.d. NPPES

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

DR. KATHERINE WILLIAMS M.D. (NPI 1710371463) is an individual internal medicine provider in Saint Helena, California, licensed in California (G57420) and active in the NPI registry since March 2015. She is enrolled in Medicare PECOS and is a graduate of University Of California, San Francisco School Of Medicine (1984).

NPPES Registry Identity

NPI1710371463
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. KATHERINE WILLIAMSCredential: M.D.
Location Address2800 ST. HELENA HIGHWAY NORTHSaint Helena, CA 94574
Mailing AddressPo Box 82Saint Helena, CA 94574-0082 · (707) 758-5936
Phone(707) 758-5936
Sole ProprietorYes
Medical School CMSUniversity Of California, San Francisco School Of MedicineGraduated 1984
Enumeration DateMarch 20, 2015
✔ NPI 1710371463 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · G57420
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
2800 ST. HELENA HIGHWAY NORTH, Saint Helena, CA 94574
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Katherine Williams M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID4880177864
PECOS Enrollment IDI20260309003307
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 Reassignment

Medicare enrollment records show Katherine Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Signify Health Medical Associates Of California, PC
50 mi
General Practice
505 MONTGOMERY ST, FL 10 & 11
San Francisco, CA 94111
  • Reassigned Medicare billing, California enrollment
  • 407 clinicians in this Medicare group
NPI 1124685169 (972) 715-3800

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 94574 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
$145.99 typical visit price
range $65.08 – $192.16
Typical copayment $36.49 (range $16.27 – $48.04)
Most-billed visit code 99204
Established Patient
$113.15 typical visit price
range $21.86 – $157.83
Typical copayment $28.28 (range $5.46 – $39.45)
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.

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 Katherine Williams's NPI number?

The NPI number for Katherine Williams is 1710371463. It was assigned to this individual provider in the NPPES registry on March 20, 2015.

Where is Katherine Williams located?

Katherine Williams practices at 2800 St. Helena Highway North, Saint Helena, CA 94574. The listed phone number is (707) 758-5936.

What is Katherine Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Katherine Williams enrolled in Medicare?

Yes. Katherine Williams is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Katherine Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Williams reassigns Medicare benefits to Signify Health Medical Associates Of California, PC (San Francisco, CA). The 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 Katherine Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Katherine Williams was last updated on March 20, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.