Dr. Robert R. Williams, MD
- Medicare services, 2021
- 76
- Part D claims, 2024
- 135
- Hospital affiliations
- 1
- Industry payments
- $9,222
- Medical group
- 1
- Practice address
- 1420 North Tracy Blvd, Tracy, CA 95376
- Practice phone
- Call (209) 835-1500
- 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. Robert R. Williams is an internist in Tracy, California
Dr. Williams practices at Sutter Tracy Community Hospital in Tracy, California, part of Sutter Health.
Dr. Williams' NPI, 1184682254, was assigned on May 1, 2006. Dr. Williams graduated from Boonshoft School of Medicine in 1985. Dr. Williams holds California license G62642.
- NPI
- 1184682254NPI Registry (opens in a new tab)
- NPI enumeration date
- May 1, 2006
- NPI status
- Active
- Practice phone
- (209) 835-1500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Robert R. Williams practices at Sutter Tracy Community Hospital in Tracy, California
Dr. Williams' primary practice is Sutter Tracy Community Hospital, at 1420 North Tracy Blvd, Tracy, CA 95376 in San Joaquin County. The practice phone is (209) 835-1500.
- Sutter Tracy Community Hospital1420 North Tracy Blvd, Tracy, CA 95376 · San Joaquin CountyPhone(209) 835-1500
Source: Dmand AI Affiliation Data
Dr. Robert R. Williams is affiliated with 2 sites of care and 1 medical group
Dr. Williams' primary practice is Sutter Tracy Community Hospital in Tracy, California, part of Sutter Health. The medical group on file is SGMF Radiology. Dmand AI also links Dr. Williams to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Robert R. Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sutter Tracy Community Hospital | Available with a free account |
| +1 more affiliated site | 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 Sutter Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Robert R. Williams is one of 16,751 internists in California
Internal medicine is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207R00000X. 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 Ohio.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Ohio license
Internists near Dr. Williams
Counts of internists 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. Robert R. Williams billed Medicare for 76 services in 2021
CMS data shows 76 Medicare services from Dr. Williams across 2 procedure codes in 2021, all of them office visits. Medicare paid $2,337 for them. Every service was in an office.
Dr. Williams' Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 3972021: 7681%
- Drugs given in the office
- 2020: 682021: 0100%
- Lab and pathology
- 2020: 142021: 0100%
- Tests and treatments
- 2020: 592021: 0100%
- Other services
- 2020: 532021: 0100%
Dr. Williams compared with the California median for internists, 2021
- Dr. Williams
- California median
- Medicare services
- 76vs 36179% below
- Part D claims
- 12vs 42197% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2021
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Williams?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert R. Williams' patients have a median age of 25
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 25, with 35% 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 25
Patient panel by sex, all payers
- Women35%
- Men65%
Source: Dmand AI Patient Panel Data
Dr. Robert R. Williams wrote 135 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 135 Medicare Part D claims for 42 patients. 96% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $37 in total drug cost. In 2023, CMS named 99 claims across 6 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic129 claims96%
- Brand-name and other6 claims4%
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
- Antibiotics14%19 of 135 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: 992024: 1288%
Drugs named by CMS: 1 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
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Dr. Robert R. Williams received $9,222 in industry payments from 2016 to 2020
CMS Open Payments shows 623 general payments to Dr. Williams from 43 drug and device companies from 2016 to 2020. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $1,118.
General payments to Dr. Williams by program year, 2016 to 2020
General payments to Dr. Williams by kind, 2016 to 2020
- Food and beverage$9,218100%
- Education$50%
Companies that paid Dr. Williams the most, 2016 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert R. Williams has 1 award and honors on record
Dmand AI lists 1 award for Dr. Williams, most recently CMS Stage 1 EHR in 2013.
Awards and honors for Dr. Williams
- 2013
- CMS Stage 1 EHR
Source: Dmand AI Professional Profile Data
Dr. Robert R. Williams graduated from Boonshoft School of Medicine
Dr. Williams graduated from Boonshoft School of Medicine in 1985.
- Medical school
- Board certified in pediatrics
Source: Dmand AI Professional Profile Data
Dr. Robert R. Williams accepts plans from 14 insurance carriers
Dr. Williams is in network with 14 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Elevance. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Aetna
- Alliant Health Plans
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +6 more carriersWith a free account
Plan types Dr. Williams accepts, by number of carriers
- PPO10
- HMO6
- Medicare5
- POS4
- EPO3
Source: Dmand AI Insurance Network Data
Sources for Dr. Robert R. 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. Robert R. 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. Robert R. Williams' NPI number?
Dr. Robert R. Williams' NPI number is 1184682254. It was assigned on May 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert R. Williams?
Dr. Robert R. Williams is an internist in Tracy, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Robert R. Williams practice?
Dr. Williams practices at 1420 North Tracy Blvd, Tracy, CA 95376. Dr. Williams' primary practice is Sutter Tracy Community Hospital in Tracy, California, part of Sutter Health. Dmand AI also links Dr. Williams to 1 group practice or clinic.
What is Dr. Robert R. Williams' office phone number?
The practice phone on file for Dr. Williams is (209) 835-1500.
What is Dr. Robert R. Williams' medical license number?
Dr. Williams holds California license G62642, one of the licenses on file in 2 states.
Which states has Dr. Robert R. Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in California (1988 to 2026) and Ohio (1986 to 1990).
Which hospitals is Dr. Robert R. Williams affiliated with?
Dr. Williams practices at Sutter Tracy Community Hospital in Tracy, California.
What medical group is Dr. Robert R. Williams part of?
Dr. Williams is linked to SGMF Radiology.
Does Dr. Robert R. Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 76 services in 2021.
Is Dr. Robert R. Williams board certified?
Yes. Dr. Williams is board certified in pediatrics by the American Board of Pediatrics.
Show 6 more questionsShow fewer questions
What services does Dr. Robert R. Williams bill to Medicare?
In 2021, Dr. Williams' most billed Medicare services were office visit, established patient (99213) and office visit, established patient (99214).
Where did Dr. Robert R. Williams go to medical school?
Dr. Williams graduated from Boonshoft School of Medicine in 1985.
What drugs does Dr. Robert R. Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Levothyroxine Sodium.
Has Dr. Robert R. Williams received payments from drug or device companies?
CMS Open Payments shows $9,222 in general payments to Dr. Williams from 43 companies from 2016 to 2020. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Robert R. Williams been practicing?
Dr. Williams graduated from medical school in 1985, 41 years ago.
What insurance does Dr. Robert R. Williams accept?
Dr. Williams is in network with 14 carriers, including Blue Cross Blue Shield of Michigan, United Healthcare and Elevance. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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