David T. Williams
- Medicare services, 2024
- 1,182
- Medicare patients, 2024
- 565
- Part D claims, 2024
- 368
- MIPS score, 2024
- 97
- Hospital affiliations
- 2
- Practice address
- 250 Bon Air Road, Greenbrae, CA 94904
- Practice phone
- Call (415) 925-7900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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David T. Williams is an emergency medicine physician in Greenbrae, California
David Williams practices at MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District.
David Williams' NPI, 1518012954, was assigned on January 24, 2007. David Williams graduated from University of California, Irvine, California College of Medicine in 2002. David Williams holds California license A86619.
- NPI
- 1518012954NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688815863
- NPI enumeration date
- January 24, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (415) 925-7900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
David T. Williams practices at MarinHealth Medical Center in Greenbrae, California
David Williams' primary practice is MarinHealth Medical Center, at 250 Bon Air Road, Greenbrae, CA 94904 in Marin County. The practice phone is (415) 925-7900.
- MarinHealth Medical Center250 Bon Air Road, Greenbrae, CA 94904 · Marin CountyPhone(415) 925-7900
Source: Dmand AI Affiliation Data
David T. Williams is affiliated with 4 sites of care and 5 medical groups
David Williams' primary practice is MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District. David Williams is also affiliated with Adventist Health St. Helena. The medical group on file is Vituity. Dmand AI also links David Williams to 4 more medical groups and 2 group practices and clinics, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at David T. Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where David Williams practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MarinHealth Medical Center | Available with a free account |
| +3 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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David T. Williams is one of 7,423 emergency medicine physicians in California
Emergency medicine is David Williams' primary specialty in the NPI Registry, under taxonomy code 207P00000X. David Williams is licensed in California.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
Emergency medicine physicians near David 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
David T. Williams billed Medicare for 1,182 services in 2024
CMS data shows 1,182 Medicare services from David Williams across 7 procedure codes in 2024, for 565 Medicare patients. Medicare paid $94,450 for them. Every service was in a facility, such as a hospital, rather than an office.
David Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5552024: 5855%
- Tests and treatments
- 2023: 5062024: 508No change
- Imaging
- 2023: 992024: 8910%
David Williams compared with the California median for emergency medicine physicians, 2024
- David Williams
- California median
- Medicare services
- 1,182vs 2654.5 times
- Medicare patients
- 565vs 2432.3 times
- Part D claims
- 270vs 624.4 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
David 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
David T. Williams treated 565 Medicare patients in 2024, average age 77
CMS counts 565 Medicare patients who saw David Williams in 2024. The largest group is 75 to 84, with 234 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 25% are also on Medicaid. Their average risk score is 1.62, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts David Williams' median patient age at 66, with 54% women.
David Williams' Medicare patients by age, 2024
David Williams' Medicare patients by sex, 2024
- Women31856%
- Men24744%
Chronic conditions among David Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis55%
- Anxiety41%
- Mood disorders40%
- Ischemic heart disease35%
- Depression34%
- Atrial fibrillation32%
Share of Medicare patients with each condition. A patient can have several.
David Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
David T. Williams wrote 368 Medicare Part D claims in 2024
In 2024, David Williams wrote 368 Medicare Part D claims for 193 patients. 95% of them were for generic drugs. CMS names the drug for 270 of them, across 7 drugs with 11 or more claims each, at $2,074 in total drug cost. In 2023, CMS named 187 claims across 7 drugs.
David Williams' Part D claims by kind of drug, 2024
- Generic349 claims95%
- Brand-name19 claims5%
David 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 David Williams' Part D claims, 2024
- Opioids24%88 of 368 claims
- Antibiotics36%132 of 368 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: 1872024: 27044%
Drugs named by CMS: 7 in 2024, 7 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
David T. Williams scored 97 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 out of 100 for David Williams for performance year 2024, reported as part of a group. David Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
David Williams' MIPS scores, performance year 2024
- 97of 100Final score
- 90of 100Quality
- 40of 100Improvement Activities
- 78of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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David T. Williams graduated from University of California, Irvine, California College of Medicine
David Williams graduated from University of California, Irvine, California College of Medicine in 2002.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for David T. 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (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 David T. 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 David T. Williams' NPI number?
David T. Williams' NPI number is 1518012954. It was assigned on January 24, 2007, and it is active in the NPI Registry.
What does David T. Williams specialize in?
David T. Williams is an emergency medicine physician in Greenbrae, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does David T. Williams practice?
David Williams practices at 250 Bon Air Road, Greenbrae, CA 94904. David Williams' primary practice is MarinHealth Medical Center in Greenbrae, California, part of Marin Healthcare District. Dmand AI also links David Williams to 4 medical groups and 2 group practices and clinics.
What is David T. Williams' office phone number?
The practice phone on file for David Williams is (415) 925-7900.
What is David T. Williams' medical license number?
David Williams holds California license A86619.
Which hospitals is David T. Williams affiliated with?
David Williams practices at MarinHealth Medical Center in Greenbrae, California. David Williams is also affiliated with Adventist Health St. Helena.
What medical group is David T. Williams part of?
David Williams is linked to Vituity. Dmand AI links David Williams to 4 more medical groups.
Does David T. Williams accept Medicare?
Yes. CMS data shows David Williams billed Medicare for 1,182 services in 2024, and David Williams accepts Medicare assignment.
What is David T. Williams' MIPS score?
David Williams' MIPS final score for performance year 2024 is 97 out of 100, reported as part of a group.
How many Medicare patients does David T. Williams see?
CMS counts 565 Medicare patients who saw David Williams in 2024, with an average age of 77.
Show 4 more questionsShow fewer questions
What services does David T. Williams bill to Medicare?
In 2024, David Williams' most billed Medicare services were heart test or procedure (93010), emergency department visit (99285) and critical care (99291).
Where did David T. Williams go to medical school?
David Williams graduated from University of California, Irvine, California College of Medicine in 2002.
What drugs does David T. Williams prescribe most?
In 2024 Medicare Part D data, David Williams' most prescribed drugs by claims were Oxycodone-Acetaminophen, Cephalexin and Doxycycline Monohydrate.
How long has David T. Williams been practicing?
David Williams graduated from medical school in 2002, 24 years ago.
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