Dr. Sean Williams, MD
- Hospital affiliations
- 1
- Industry payments
- $257
- Medical group
- 1
- Insurance carriers
- 7
- State licenses
- 2
- Practice address
- 2500 Alhambra Avenue, Martinez, CA 94553
- Practice phone
- Call (925) 370-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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. Sean Williams is a pediatrician in Martinez, California
Dr. Williams practices at Contra Costa Regional Medical Center in Martinez, California, part of State of California.
Dr. Williams' NPI, 1033313242, was assigned on June 12, 2007. Dr. Williams graduated from Keck School of Medicine of USC in 2005. Dr. Williams holds California license A97319.
- NPI
- 1033313242NPI Registry (opens in a new tab)
- NPI enumeration date
- June 12, 2007
- NPI status
- Active
- Practice phone
- (925) 370-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Sean Williams practices at Contra Costa Regional Medical Center in Martinez, California
Dr. Williams' primary practice is Contra Costa Regional Medical Center, at 2500 Alhambra Avenue, Martinez, CA 94553 in Contra Costa County. The practice phone is (925) 370-5000.
- Contra Costa Regional Medical Center2500 Alhambra Avenue, Martinez, CA 94553 · Contra Costa CountyPhone(925) 370-5000
Source: Dmand AI Affiliation Data
Dr. Sean Williams is affiliated with 1 site of care and 1 medical group
Dr. Williams' primary practice is Contra Costa Regional Medical Center in Martinez, California, part of State of California. The medical group on file is West County Adult Mental Health Services. 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. Sean 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 |
|---|---|
| Contra Costa Regional Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Sean Williams is one of 8,236 pediatricians in California
Pediatrics is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 208000000X. Dr. Williams is board certified in pediatrics by the American Board of Pediatrics. Dmand AI has Dr. Williams' licenses on file in 2 states: California and Hawaii.
Specialties and state licenses
- Pediatrics, CaliforniaPrimary
- Hawaii license
Pediatricians near Dr. Williams
Counts of pediatricians 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. Sean Williams' patients have a median age of 11
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 11, with 29% 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 11
Patient panel by sex, all payers
- Women29%
- Men71%
Source: Dmand AI Patient Panel Data
Dr. Sean Williams received $257 in industry payments from 2024 to 2025
CMS Open Payments shows 4 general payments to Dr. Williams from 4 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Globus Medical, Inc. paid the most, $163.
General payments to Dr. Williams by program year, 2024 to 2025
Companies that paid Dr. Williams the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Sean Williams graduated from Keck School of Medicine of USC
Dr. Williams graduated from Keck School of Medicine of USC in 2005.
- Medical school
- Board certified in pediatrics
Source: Dmand AI Professional Profile Data
Dr. Sean Williams accepts plans from 7 insurance carriers
Dr. Williams is in network with 7 carriers, including Elevance, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
- DentaQuest
Plan types Dr. Williams accepts, by number of carriers
- PPO7
- Medicare6
- HMO3
- POS3
- EPO1
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Sean 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 patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Sean 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. Sean Williams' NPI number?
Dr. Sean Williams' NPI number is 1033313242. It was assigned on June 12, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Sean Williams?
Dr. Sean Williams is a pediatrician in Martinez, California. The primary specialty in the NPI Registry is Pediatrics Physician (taxonomy code 208000000X).
Where does Dr. Sean Williams practice?
Dr. Williams practices at 2500 Alhambra Avenue, Martinez, CA 94553. Dr. Williams' primary practice is Contra Costa Regional Medical Center in Martinez, California, part of State of California.
What is Dr. Sean Williams' office phone number?
The practice phone on file for Dr. Williams is (925) 370-5000.
What is Dr. Sean Williams' medical license number?
Dr. Williams holds California license A97319, one of the licenses on file in 2 states.
Which states has Dr. Sean Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in California (2006 to 2026) and Hawaii (2015 to 2026).
Which hospitals is Dr. Sean Williams affiliated with?
Dr. Williams practices at Contra Costa Regional Medical Center in Martinez, California.
What medical group is Dr. Sean Williams part of?
Dr. Williams is linked to West County Adult Mental Health Services.
Is Dr. Sean Williams board certified?
Yes. Dr. Williams is board certified in pediatrics by the American Board of Pediatrics.
Where did Dr. Sean Williams go to medical school?
Dr. Williams graduated from Keck School of Medicine of USC in 2005.
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Has Dr. Sean Williams received payments from drug or device companies?
CMS Open Payments shows $257 in general payments to Dr. Williams from 4 companies from 2024 to 2025. The largest total came from Globus Medical, Inc.
How long has Dr. Sean Williams been practicing?
Dr. Williams graduated from medical school in 2005, 21 years ago.
What insurance does Dr. Sean Williams accept?
Dr. Williams is in network with 7 carriers, including Elevance, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
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