Dr. Gregory Grant Williams, MD
- Medicare services, 2019
- 23
- Part D claims, 2024
- 85
- Industry payments
- $1,774
- Affiliated sites
- 4
- Medical groups
- 2
- Practice address
- 4580 California Ave, Bakersfield, CA 93309
- Practice phone
- Call (661) 327-4411
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Bakersfield Family Medical Group
Urgent Care Center · Bakersfield, California
Find Dr. Williams' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Gregory Grant Williams is a general surgeon in Bakersfield, California
Dr. Williams practices at Bakersfield Family Medical Group in Bakersfield, California.
Dr. Williams' NPI, 1699795088, was assigned on July 20, 2006. Dr. Williams graduated from University of Kansas School of Medicine - Kansas City in 1990. Dr. Williams' California license number on file is G73172.
- NPI
- 1699795088NPI Registry (opens in a new tab)
- NPI enumeration date
- July 20, 2006
- NPI status
- Active
- Practice phone
- (661) 327-4411
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Gregory Grant Williams practices at Bakersfield Family Medical Group in Bakersfield, California
Dr. Williams' primary practice is Bakersfield Family Medical Group, at 4580 California Ave, Bakersfield, CA 93309. The practice phone is (661) 327-4411.
- Bakersfield Family Medical Group4580 California Ave, Bakersfield, CA 93309Phone(661) 327-4411
Source: Dmand AI Affiliation Data
Dr. Gregory Grant Williams is affiliated with 4 sites of care and 2 medical groups
Dr. Williams' primary practice is Bakersfield Family Medical Group in Bakersfield, California. The medical group on file is Bakersfield Family Medical Group. Dmand AI also links Dr. Williams to 2 more group practices and clinics, 1 physician office and 1 medical group, each named with a free account. Dr. Williams' employer is on file too: an urgent care center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Gregory Grant Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Bakersfield Family Medical Group | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory Grant Williams is one of 2,926 general surgeons in California
Surgery is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Williams is board certified in phlebology by the American Board of Venous and Lymphatic Medicine. Dr. Williams has a license on file in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
General surgeons near Dr. Williams
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory Grant Williams billed Medicare for 23 services in 2019
CMS data shows 23 Medicare services from Dr. Williams across 2 procedure codes in 2019, all of them office visits. Medicare paid $799 for them. Every service was in an office.
Dr. Williams' Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 2502019: 2391%
- Imaging
- 2018: 302019: 0100%
- Tests and treatments
- 2018: 602019: 0100%
- Surgery
- 2018: 352019: 0100%
Dr. Williams compared with the California median for general surgeons, 2019
- Dr. Williams
- California median
- Medicare services
- 23vs 16686% below
- Part D claims
- 37vs 349% above
Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other general surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory Grant Williams' patients have a median age of 71
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 71, with 54% women.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women54%
- Men45%
Source: Dmand AI Patient Panel Data
Dr. Gregory Grant Williams wrote 85 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 85 Medicare Part D claims for 31 patients. 89% of them were for generic drugs. CMS names the drug for 37 of them, across 3 drugs with 11 or more claims each, at $248 in total drug cost. In 2023, CMS named 42 claims across 2 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic76 claims89%
- Brand-name and other9 claims11%
Dr. Williams' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Williams' Part D claims, 2024
- Antibiotics65%55 of 85 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 422024: 3712%
Drugs named by CMS: 3 in 2024, 2 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Gregory Grant Williams received $1,774 in industry payments from 2016 to 2025
CMS Open Payments shows 70 general payments to Dr. Williams from 3 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Organogenesis Inc. paid the most, $1,017.
General payments to Dr. Williams by program year, 2016 to 2025
Companies that paid Dr. Williams the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory Grant Williams has 1 award and honors on record
Dmand AI lists 1 award for Dr. Williams.
Awards and honors for Dr. Williams
- Undated
- ACS Fellow
Source: Dmand AI Professional Profile Data
Dr. Gregory Grant Williams graduated from University of Kansas School of Medicine - Kansas City
Dr. Williams graduated from University of Kansas School of Medicine - Kansas City in 1990. Dr. Williams is a member of ACP and ACS.
- Medical school
- Board certified in phlebology
Source: Dmand AI Professional Profile Data
Dr. Gregory Grant Williams accepts plans from 11 insurance carriers
Dr. Williams is in network with 11 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- Alliant Health Plans
- Aspirus Health Plan
- +3 more carriersWith a free account
Plan types Dr. Williams accepts, by number of carriers
- PPO8
- Medicare6
- HMO4
- POS4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory Grant Williams's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregory Grant Williams
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregory Grant Williams' NPI number?
Dr. Gregory Grant Williams' NPI number is 1699795088. It was assigned on July 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory Grant Williams?
Dr. Gregory Grant Williams is a general surgeon in Bakersfield, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gregory Grant Williams practice?
Dr. Williams practices at 4580 California Ave, Bakersfield, CA 93309. Dr. Williams' primary practice is Bakersfield Family Medical Group in Bakersfield, California. Dmand AI also links Dr. Williams to 2 group practices and clinics, 1 physician office and 1 medical group.
What is Dr. Gregory Grant Williams' office phone number?
The practice phone on file for Dr. Williams is (661) 327-4411.
What is Dr. Gregory Grant Williams' medical license number?
Dr. Williams' California license number on file is G73172.
What medical group is Dr. Gregory Grant Williams part of?
Dr. Williams is linked to Bakersfield Family Medical Group. Dmand AI links Dr. Williams to 1 more medical group.
Does Dr. Gregory Grant Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 23 services in 2019.
Is Dr. Gregory Grant Williams board certified?
Yes. Dr. Williams is board certified in phlebology by the American Board of Venous and Lymphatic Medicine.
What services does Dr. Gregory Grant Williams bill to Medicare?
In 2019, Dr. Williams' most billed Medicare services were office visit, established patient (99212) and office visit, established patient (99213).
Where did Dr. Gregory Grant Williams go to medical school?
Dr. Williams graduated from University of Kansas School of Medicine - Kansas City in 1990.
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What drugs does Dr. Gregory Grant Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Doxycycline Hyclate, Levofloxacin and Sulfamethoxazole-Trimethoprim.
Has Dr. Gregory Grant Williams received payments from drug or device companies?
CMS Open Payments shows $1,774 in general payments to Dr. Williams from 3 companies from 2016 to 2025. The largest total came from Organogenesis Inc.
How long has Dr. Gregory Grant Williams been practicing?
Dr. Williams graduated from medical school in 1990, 36 years ago.
What insurance does Dr. Gregory Grant Williams accept?
Dr. Williams is in network with 11 carriers, including Aetna, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
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