Dr. John Williams III III, MD
- Hospital affiliations
- 1
- Industry payments
- $174
- Medical groups
- 2
- Insurance carriers
- 12
- State license
- 1
- Practice address
- 8700 Beverly Blvd, Los Angeles, CA 90048
- Practice phone
- Call (310) 423-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Williams III's 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. John Williams III III is a maternal-fetal medicine specialist in West Hollywood, California
Dr. Williams III practices at Cedars-Sinai Medical Center in Los Angeles, California, part of Cedars-Sinai Health System.
Dr. Williams III's NPI, 1205819133, was assigned on November 23, 2005. Dr. Williams III graduated from David Geffen School of Medicine at UCLA in 1978. Dr. Williams III holds California license G39794.
- NPI
- 1205819133NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4385784594
- NPI enumeration date
- November 23, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 423-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 74
- Medical school graduation
- 1978
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Williams III III practices at Cedars-Sinai Medical Center in Los Angeles, California
Dr. Williams III's primary practice is Cedars-Sinai Medical Center, at 8700 Beverly Blvd, Los Angeles, CA 90048 in Los Angeles County. The practice phone is (310) 423-5000.
- Cedars-Sinai Medical Center8700 Beverly Blvd, Los Angeles, CA 90048 · Los Angeles CountyPhone(310) 423-5000
Source: Dmand AI Affiliation Data
Dr. John Williams III III is affiliated with 1 site of care and 2 medical groups
Dr. Williams III's primary practice is Cedars-Sinai Medical Center in Los Angeles, California, part of Cedars-Sinai Health System. The medical group on file is Cedars-Sinai Medical Center. Dmand AI also links Dr. Williams III to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Williams III III's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams III practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cedars-Sinai Medical Center | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Cedars-Sinai Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John Williams III III is one of 318 maternal-fetal medicine specialists in California
Maternal and fetal medicine is Dr. Williams III's primary specialty in the NPI Registry, under taxonomy code 207VM0101X. Dr. Williams III is board certified in clinical cytogenetics by the American Board of Medical Genetics and Genomics. Dr. Williams III is licensed in California.
Specialties and state licenses
- Maternal and fetal medicine, CaliforniaPrimary
Maternal-fetal medicine specialists near Dr. Williams III
Counts of maternal-fetal medicine specialists 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. John Williams III III's patients have a median age of 36
Across all payers, Dmand AI patient panel data puts Dr. Williams III's median patient age at 36, with 91% women.
Dr. Williams III's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 36
Patient panel by sex, all payers
- Women91%
- Men7%
Source: Dmand AI Patient Panel Data
How Dr. John Williams III III takes part in Medicare
Dr. Williams III 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)
Dr. John Williams III III received $174 in industry payments from 2021 to 2023
CMS Open Payments shows 10 general payments to Dr. Williams III from 1 drug or device company from 2021 to 2023. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $174.
General payments to Dr. Williams III by program year, 2021 to 2023
Companies that paid Dr. Williams III the most, 2021 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Williams III III graduated from David Geffen School of Medicine at UCLA
Dr. Williams III graduated from David Geffen School of Medicine at UCLA in 1978. Dr. Williams III is a member of American College of Obstetricians and Gynecologists.
- Medical school
- Board certified in clinical cytogenetics
- Board certified in clinical genetics
- Board certified in maternal-fetal medicine
- Board certified in obstetrics & gynecology
Source: Dmand AI Professional Profile Data
Dr. John Williams III III accepts plans from 12 insurance carriers
Dr. Williams III is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- Alliant Health Plans
- +4 more carriersWith a free account
Plan types Dr. Williams III accepts, by number of carriers
- PPO9
- HMO6
- Medicare6
- EPO4
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. John Williams III III'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 |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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. John Williams III III
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. John Williams III III's NPI number?
Dr. John Williams III III's NPI number is 1205819133. It was assigned on November 23, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. John Williams III III?
Dr. John Williams III III is a maternal-fetal medicine specialist in West Hollywood, California. The primary specialty in the NPI Registry is Maternal & Fetal Medicine Physician (taxonomy code 207VM0101X).
Where does Dr. John Williams III III practice?
Dr. Williams III practices at 8700 Beverly Blvd, Los Angeles, CA 90048. Dr. Williams III's primary practice is Cedars-Sinai Medical Center in Los Angeles, California, part of Cedars-Sinai Health System. Dmand AI also links Dr. Williams III to 1 medical group.
What is Dr. John Williams III III's office phone number?
The practice phone on file for Dr. Williams III is (310) 423-5000.
What is Dr. John Williams III III's medical license number?
Dr. Williams III holds California license G39794.
Which hospitals is Dr. John Williams III III affiliated with?
Dr. Williams III practices at Cedars-Sinai Medical Center in Los Angeles, California.
What medical group is Dr. John Williams III III part of?
Dr. Williams III is linked to Cedars-Sinai Medical Center. Dmand AI links Dr. Williams III to 1 more medical group.
Does Dr. John Williams III III accept Medicare?
Yes. CMS lists Dr. Williams III as accepting Medicare assignment.
Is Dr. John Williams III III board certified?
Yes. Dr. Williams III is board certified in clinical cytogenetics by the American Board of Medical Genetics and Genomics.
Where did Dr. John Williams III III go to medical school?
Dr. Williams III graduated from David Geffen School of Medicine at UCLA in 1978.
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Has Dr. John Williams III III received payments from drug or device companies?
CMS Open Payments shows $174 in general payments to Dr. Williams III from 1 company from 2021 to 2023. The largest total came from Novo Nordisk Inc.
How long has Dr. John Williams III III been practicing?
Dr. Williams III graduated from medical school in 1978, 48 years ago.
What insurance does Dr. John Williams III III accept?
Dr. Williams III is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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