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DR. GREGORY GRANT WILLIAMS MD
NPI 1699795088
Surgery in Bakersfield, CA

Active since July 20, 2006PECOS Enrolled
1500 HAGGIN OAKS BLVD, 202, BAKERSFIELD, CA 93311(661) 654-8346(661) 654-8337 Get Directions Write a Review

NPPES record last updated: November 12, 2011. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Gregory Grant Williams Md NPPES

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

DR. GREGORY GRANT WILLIAMS MD (NPI 1699795088) is an individual surgery provider in Bakersfield, California, licensed in California (G73172) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1699795088
Entity TypeIndividualMale
Primary Taxonomy208600000X
Provider Legal NameDR. GREGORY GRANT WILLIAMSCredential: MD
Location Address1500 HAGGIN OAKS BLVD, 202Bakersfield, CA 93311-1333
Mailing Address1500 Haggin Oaks Blvd, 202Bakersfield, CA 93311-1333 · (661) 654-8346 · Fax (661) 654-8337
Phone(661) 654-8346
Fax(661) 654-8337
Sole ProprietorYes
Enumeration DateJuly 20, 2006
Last NPPES UpdateNovember 12, 2011
✔ NPI 1699795088 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians
Taxonomy Code208600000X
License✔ Licensed in CA · G73172
Definition
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
1500 HAGGIN OAKS BLVD, Bakersfield, CA 93311
Open in Google Maps ↗

Other Identifiers 2

Medicare PINZZZ25253ZCA
Other1053508176CA · Type 2 Npi

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Gregory Grant Williams Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Gregory Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Bakersfield Family Medical Group Inc
3.2 mi
Multi-Specialty
4580 CALIFORNIA AVE
Bakersfield, CA 93309
  • Reassigned Medicare billing, California enrollment
  • 51 clinicians in this Medicare group
NPI 1013912641 (661) 327-4411
Ronald J. Ostrom, P.C. Corporation
3.7 mi
Multi-Specialty
3900 COFFEE RD STE 3
Bakersfield, CA 93308
  • Reassigned Medicare billing, California enrollment
  • 10 clinicians in this Medicare group
NPI 1811652688 (661) 587-0700

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 93311 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
$91.09 typical visit price
range $59.26 – $178.09
Typical copayment $22.77 (range $14.81 – $44.52)
Most-billed visit code 99203
Established Patient
$73.67 typical visit price
range $19.34 – $145.64
Typical copayment $18.41 (range $4.83 – $36.41)
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 2

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

GREGORY G WILLIAMS MD INC A MEDICAL CORPORATION
Clinic/Center (Medical Specialty)
1500 HAGGIN OAKS BLVD, 202
BAKERSFIELD, CA 93311
Kern County (661) 654-8346
OAK HILLS MEDICAL CORPORATION
Surgery (Vascular Surgery)
1500 HAGGIN OAKS BLVD, 202
BAKERSFIELD, CA 93311
Kern County (661) 654-8346

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 Gregory Williams's NPI number?

The NPI number for Gregory Williams is 1699795088. It was assigned to this individual provider in the NPPES registry on July 20, 2006.

Where is Gregory Williams located?

Gregory Williams practices at 1500 Haggin Oaks Blvd 202, Bakersfield, CA 93311. The listed phone number is (661) 654-8346.

What is Gregory Williams's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Is Gregory Williams enrolled in Medicare?

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

Which organizations bill Medicare for Gregory Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Williams reassigns Medicare benefits to 2 organizations: Bakersfield Family Medical Group Inc (Bakersfield, CA) and Ronald J. Ostrom, P.C. Corporation (Bakersfield, CA). 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 Gregory 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 Gregory Williams was last updated on November 12, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.