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Dr. Michael Williams, MD
NPI1225410236PAC ID1355612631
- Medicare services, 2024
- 310
- Medicare patients, 2024
- 221
- Part D claims, 2021
- 84
- Publications
- 1
- Hospital affiliations
- 2
- 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
Find Dr. Williams' professional email, personal email and mobile number
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Dr. Michael Williams is a cardiologist in Fairfield, California
Dr. Williams practices at NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare.
Dr. Williams' NPI, 1225410236, was assigned on June 25, 2015. Dr. Williams graduated from Penn State College of Medicine in 2015. Dr. Williams holds Montana license 142809.
NPI and contact details
- NPI
- 1225410236NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1355612631
- NPI enumeration date
- June 25, 2015
- 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
- 45
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael 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. Michael Williams is affiliated with 3 sites of care and 2 medical groups
Dr. Williams' primary practice is NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare. Dr. Williams is also affiliated with San Juan Regional Medical Center. The medical group on file is Billings Clinic. Dmand AI also links Dr. Williams to 1 more group practice or clinic and 1 medical group, each named with a free account.
San Juan Regional Medical CenterBillings Clinic1 group practice or clinicName with a free account1 medical groupName with a free account
See all 5 affiliations for Dr. WilliamsSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| NorthBay Medical Center | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael Williams is one of 2,375 cardiologists in California
Cardiovascular disease is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Williams is board certified in cardiovascular disease by the American Board of Internal Medicine. Dmand AI has Dr. Williams' licenses on file in 4 states: Montana, California, Virginia and Rhode Island.
Specialties and state licenses
- Cardiovascular disease, MontanaPrimary
- California license
- Interventional cardiology, Virginia
- Rhode Island license
Cardiologists near Dr. Williams
Counts of cardiologists with a Dmand AI profile, by place and practice. Each opens the list.
2,375cardiologists in California10cardiologists in Fairfield6cardiologists at NorthBay Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Michael Williams billed Medicare for 310 services in 2024
CMS data shows 310 Medicare services from Dr. Williams across 4 procedure codes in 2024, for 221 Medicare patients. Medicare paid $9,341 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 2024310
Medicare patients221
Paid by Medicare$9,341
Procedure codes4
Dr. Williams' Medicare services by type, 2024
- Tests and treatments230
- Office and hospital visits80
Dr. Williams compared with the California median for cardiologists, 2024
- Dr. Williams
- California median
- Medicare services
- 310vs 1,56080% below
- Medicare patients
- 221vs 64466% below
- Part D claims
- 84vs 1,41094% below
Medians across 2,237 cardiologists 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. Michael Williams treated 221 Medicare patients in 2024, average age 74
CMS counts 221 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 88 patients. 75% of them have high blood pressure, and 71% have high cholesterol. 22% are also on Medicaid. Their average risk score is 1.50, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 75, with 19% women.
Medicare patients, 2024221
Average age74
Average risk score1.50
Also on Medicaid22%
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women10347%
- Men11853%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol71%
- Atrial fibrillation48%
- Heart failure48%
- Ischemic heart disease46%
- Arthritis45%
- Chronic kidney disease38%
- Diabetes37%
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 75
Patient panel by sex, all payers
- Women19%
- Men81%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michael Williams wrote 84 Medicare Part D claims in 2021
In 2021, Dr. Williams wrote 84 Medicare Part D claims. They cover 5 drugs, with $15,220 in total drug cost. In 2020, CMS named 70 claims across 5 drugs.
Part D claims, 202184
Drugs named by CMS5
Total drug cost$15,220
Dr. Williams' most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 702021: 8420%
Drugs named by CMS: 5 in 2021, 5 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Michael Williams takes part in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Coronary angioplasty and stenting: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Michael Williams has 1 publication on record
Dmand AI links 1 paper to Dr. Williams in 2015. Dr. Williams' most frequent co-author is Michele M. Carr, DDS, MD, PhD.
Papers1
Dr. Williams' most frequent co-authors
Recent publications by Dr. Williams
See who Dr. Williams researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Williams works with, so you can find a warm path to the right cardiologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Michael Williams received $5,541 in industry payments from 2018 to 2025
CMS Open Payments shows 47 general payments to Dr. Williams from 13 drug and device companies from 2018 to 2025. Travel and lodging make up the largest share, 59% of the total. Penumbra, Inc. paid the most, $2,240.
General payments to Dr. Williams by program year, 2018 to 2025
General payments to Dr. Williams by kind, 2018 to 2025
$5.5Kin total
- Travel and lodging$3,26559%
- Food and beverage$2,05137%
- Education$2254%
Companies that paid Dr. Williams the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael Williams graduated from Penn State College of Medicine
Dr. Williams graduated from Penn State College of Medicine in 2015.
- Medical school
- Board certified in cardiovascular disease
- Board certified in internal medicine
- Board certified in interventional cardiology
- Board certified in psychiatry
Source: Dmand AI Professional Profile Data
Dr. Michael Williams accepts plans from 8 insurance carriers
Dr. Williams is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and HCSC. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- Alliant Health Plans
- CMS Medicare
- United Healthcare
Plan types Dr. Williams accepts, by number of carriers
- PPO7
- Medicare6
- POS3
- HMO2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Michael 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. Michael Williams' NPI number?
Dr. Michael Williams' NPI number is 1225410236. It was assigned on June 25, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael Williams?
Dr. Michael Williams is a cardiologist in Fairfield, California. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. Michael 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 1 group practice or clinic and 1 medical group.
What is Dr. Michael Williams' office phone number?
The practice phone on file for Dr. Williams is (707) 646-5000.
What is Dr. Michael Williams' medical license number?
Dr. Williams holds Montana license 142809, one of the licenses on file in 4 states.
Which states has Dr. Michael Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in Montana (2024 to 2026), California (2022 to 2026), Virginia (2017 to 2026) and Rhode Island (2018 to 2022).
Which hospitals is Dr. Michael Williams affiliated with?
Dr. Williams practices at NorthBay Medical Center in Fairfield, California. Dr. Williams is also affiliated with San Juan Regional Medical Center.
What medical group is Dr. Michael Williams part of?
Dr. Williams is linked to Billings Clinic. Dmand AI links Dr. Williams to 1 more medical group.
Does Dr. Michael Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 310 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. Michael Williams see?
CMS counts 221 Medicare patients who saw Dr. Williams in 2024, with an average age of 74.
Show 9 more questionsShow fewer questions
Is Dr. Michael Williams board certified?
Yes. Dr. Williams is board certified in cardiovascular disease by the American Board of Internal Medicine.
What services does Dr. Michael Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were heart test or procedure (93010), hospital inpatient care (99232) and heart test or procedure (93306).
Where did Dr. Michael Williams go to medical school?
Dr. Williams graduated from Penn State College of Medicine in 2015.
What drugs does Dr. Michael Williams prescribe most?
In 2021 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Metoprolol Succinate, Spironolactone and Eliquis.
Has Dr. Michael Williams received payments from drug or device companies?
CMS Open Payments shows $5,541 in general payments to Dr. Williams from 13 companies from 2018 to 2025. The largest total came from Penumbra, Inc.
How long has Dr. Michael Williams been practicing?
Dr. Williams graduated from medical school in 2015, 11 years ago.
Does Dr. Michael Williams do research?
Dmand AI links 1 publication to Dr. Williams.
Who does Dr. Michael Williams publish with?
Dr. Williams' most frequent co-authors are Michele M. Carr, DDS, MD, PhD (1 shared paper).
What insurance does Dr. Michael Williams accept?
Dr. Williams is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and HCSC. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
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