Dr. Benjamin Thomas Williams, MD
- Medicare services, 2024
- 901
- Medicare patients, 2024
- 551
- Part D claims, 2024
- 238
- Hospital affiliations
- 1
- Medical groups
- 4
- Practice address
- 1200 B Gale Wilson Blvd, Fairfield, CA 94533
- Practice phone
- Call (707) 646-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Benjamin Thomas Williams is an emergency medicine physician in Fairfield, California
Dr. Williams practices at NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare.
Dr. Williams' NPI, 1699091629, was assigned on April 15, 2010. Dr. Williams graduated from University of Arizona College of Medicine in 2010. Dr. Williams holds California license A124541.
- NPI
- 1699091629NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1557517794
- NPI enumeration date
- April 15, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (707) 646-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 42
- Medical school graduation
- 2010
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Benjamin Thomas Williams practices at NorthBay Medical Center in Fairfield, California
Dr. Williams' primary practice is NorthBay Medical Center, at 1200 B Gale Wilson Blvd, Fairfield, CA 94533 in Solano County. The practice phone is (707) 646-5000.
- NorthBay Medical Center1200 B Gale Wilson Blvd, Fairfield, CA 94533 · Solano CountyPhone(707) 646-5000
Source: Dmand AI Affiliation Data
Dr. Benjamin Thomas Williams is affiliated with 1 site of care and 4 medical groups
Dr. Williams' primary practice is NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare. The medical group on file is NorthBay Medical Center. Dmand AI also links Dr. Williams to 3 more medical groups, each named with a free account. Dr. Williams' employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Benjamin Thomas Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| NorthBay Medical Center | Available with a free account |
| +3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Benjamin Thomas Williams is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Williams is licensed in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near Dr. Williams
Counts of emergency medicine physicians 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. Benjamin Thomas Williams billed Medicare for 901 services in 2024
CMS data shows 901 Medicare services from Dr. Williams across 7 procedure codes in 2024, for 551 Medicare patients. Medicare paid $81,714 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6702024: 6207%
- Tests and treatments
- 2023: 2342024: 26815%
- Imaging
- 2023: 02024: 13
Dr. Williams compared with the California median for emergency medicine physicians, 2024
- Dr. Williams
- California median
- Medicare services
- 901vs 2653.4 times
- Medicare patients
- 551vs 2432.3 times
- Part D claims
- 70vs 6213% above
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2024
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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Benjamin Thomas Williams treated 551 Medicare patients in 2024, average age 73
CMS counts 551 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 181 patients. 75% of them have high blood pressure, and 70% have high cholesterol. 47% are also on Medicaid. Their average risk score is 2.15, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 49, with 57% women.
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women31557%
- Men23643%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol70%
- Arthritis47%
- Diabetes40%
- Chronic kidney disease38%
- Mood disorders37%
- Anxiety32%
- Depression32%
Share of Medicare patients with each condition. A patient can have several.
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 49
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Benjamin Thomas Williams wrote 238 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 238 Medicare Part D claims for 161 patients. 93% of them were for generic drugs. CMS names the drug for 70 of them, across 4 drugs with 11 or more claims each, at $429 in total drug cost. In 2023, CMS named 85 claims across 6 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic222 claims93%
- Brand-name16 claims7%
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
- Opioids16%39 of 238 claims
- Antibiotics19%45 of 238 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: 852024: 7018%
Drugs named by CMS: 4 in 2024, 6 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
How Dr. Benjamin Thomas Williams takes part in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Benjamin Thomas Williams graduated from University of Arizona College of Medicine
Dr. Williams graduated from University of Arizona College of Medicine in 2010.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Benjamin Thomas 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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile 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. Benjamin Thomas 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. Benjamin Thomas Williams' NPI number?
Dr. Benjamin Thomas Williams' NPI number is 1699091629. It was assigned on April 15, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Benjamin Thomas Williams?
Dr. Benjamin Thomas Williams is an emergency medicine physician in Fairfield, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Benjamin Thomas Williams practice?
Dr. Williams practices at 1200 B Gale Wilson Blvd, Fairfield, CA 94533. Dr. Williams' primary practice is NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare. Dmand AI also links Dr. Williams to 3 medical groups.
What is Dr. Benjamin Thomas Williams' office phone number?
The practice phone on file for Dr. Williams is (707) 646-5000.
What is Dr. Benjamin Thomas Williams' medical license number?
Dr. Williams holds California license A124541.
Which hospitals is Dr. Benjamin Thomas Williams affiliated with?
Dr. Williams practices at NorthBay Medical Center in Fairfield, California.
What medical group is Dr. Benjamin Thomas Williams part of?
Dr. Williams is linked to NorthBay Medical Center. Dmand AI links Dr. Williams to 3 more medical groups.
Does Dr. Benjamin Thomas Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 901 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. Benjamin Thomas Williams see?
CMS counts 551 Medicare patients who saw Dr. Williams in 2024, with an average age of 73.
What services does Dr. Benjamin Thomas Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and emergency department visit (99284).
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Where did Dr. Benjamin Thomas Williams go to medical school?
Dr. Williams graduated from University of Arizona College of Medicine in 2010.
What drugs does Dr. Benjamin Thomas Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Hydrocodone-Acetaminophen, Cephalexin and Ondansetron HCl.
How long has Dr. Benjamin Thomas Williams been practicing?
Dr. Williams graduated from medical school in 2010, 16 years ago.
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