Dr. Gary B. Marcus, MD
- Medicare services, 2024
- 282
- Medicare patients, 2024
- 94
- Part D claims, 2024
- 1,016
- Industry payments
- $360
- Affiliated sites
- 2
- Practice address
- 3300 Webster St, Oakland, CA 94609
- Practice phone
- Call (925) 327-6964
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Hill Health' & 'Hill Health Medical Group
Oakland, California
Find Dr. Marcus' 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. Gary B. Marcus is a cardiologist in Oakland, California
Dr. Marcus practices at Hill Health' & 'Hill Health Medical Group in Oakland, California.
Dr. Marcus' NPI, 1073526646, was assigned on August 14, 2006. Dr. Marcus graduated from University Of Cincinnati College Of Medicine in 1962. Dr. Marcus' California license number on file is C28611.
- NPI
- 1073526646NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0042276313
- NPI enumeration date
- August 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (925) 327-6964
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 90
- Medical school graduation
- 1962
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gary B. Marcus practices at Hill Health' & 'Hill Health Medical Group in Oakland, California
Dr. Marcus' primary practice is Hill Health' & 'Hill Health Medical Group, at 3300 Webster St, Oakland, CA 94609 in Alameda County. The practice phone is (925) 327-6964.
- Hill Health' & 'Hill Health Medical Group3300 Webster St, Oakland, CA 94609 · Alameda CountyPhone(925) 327-6964
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gary B. Marcus is affiliated with 3 sites of care and 1 medical group
Dr. Marcus' primary practice is Hill Health' & 'Hill Health Medical Group in Oakland, California. Dmand AI also links Dr. Marcus to 1 physician office, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gary B. Marcus' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marcus practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hill Health' & 'Hill Health Medical Group | 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. Gary B. Marcus is one of 2,375 cardiologists in California
Cardiovascular disease is Dr. Marcus' primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Marcus is board certified in cardiovascular disease by the American Board of Internal Medicine. Dr. Marcus has a license on file in California.
Specialties and state licenses
- Cardiovascular disease, CaliforniaPrimary
Clinical focus
Dmand AI lists aortic atherosclerois, atrial fibrillation and flutter, cardiomyopathy, cerebrovascular disease, chronic hypertension, coronary artery disease, heart blockage and heart failure among the conditions Dr. Marcus treats.
Cardiologists near Dr. Marcus
Counts of cardiologists 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. Gary B. Marcus billed Medicare for 282 services in 2024
CMS data shows 282 Medicare services from Dr. Marcus across 2 procedure codes in 2024, all of them office visits, for 94 Medicare patients. Medicare paid $31,490 for them. Every service was in an office.
Dr. Marcus' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3882024: 28227%
- Tests and treatments
- 2023: 222024: 0100%
Dr. Marcus compared with the California median for cardiologists, 2024
- Dr. Marcus
- California median
- Medicare services
- 282vs 1,56082% below
- Medicare patients
- 94vs 64485% below
- Part D claims
- 729vs 1,41048% below
Medians across 2,237 cardiologists in California with Dmand AI profiles that report each measure.
Dr. Marcus' 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.
Need commercial claims for Dr. Marcus?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marcus and other cardiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gary B. Marcus treated 94 Medicare patients in 2024, average age 78
CMS counts 94 Medicare patients who saw Dr. Marcus in 2024. The largest group is 75 to 84, with 42 patients. 75% of them have high blood pressure, and 65% have high cholesterol. 22% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marcus' median patient age at 76, with 39% women.
Dr. Marcus' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Marcus' Medicare patients by sex, 2024
- Women4346%
- Men5154%
Chronic conditions among Dr. Marcus' Medicare patients, 2024
- High blood pressure75%
- High cholesterol65%
- Atrial fibrillation40%
- Diabetes38%
- Arthritis33%
- Anxiety31%
- Ischemic heart disease30%
- Chronic kidney disease29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marcus' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women39%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gary B. Marcus wrote 1,016 Medicare Part D claims in 2024
In 2024, Dr. Marcus wrote 1,016 Medicare Part D claims for 92 patients. 84% of them were for generic drugs. CMS names the drug for 729 of them, across 25 drugs with 11 or more claims each, at $112,697 in total drug cost. In 2023, CMS named 650 claims across 22 drugs.
Dr. Marcus' Part D claims by kind of drug, 2024
- Generic854 claims84%
- Brand-name146 claims14%
- Other16 claims2%
Dr. Marcus' 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. Marcus' Part D claims, 2024
- Opioids6%63 of 1,016 claims
- Antibiotics3%27 of 1,016 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: 6502024: 72912%
Drugs named by CMS: 25 in 2024, 22 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
How Dr. Gary B. Marcus takes part in Medicare
Dr. Marcus 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)
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Dr. Gary B. Marcus received $360 in industry payments from 2017 to 2024
CMS Open Payments shows 9 general payments to Dr. Marcus from 2 drug and device companies from 2017 to 2024. Food and beverage make up the largest share, 100% of the total. Novartis Pharmaceuticals Corporation paid the most, $225.
General payments to Dr. Marcus by program year, 2017 to 2024
Companies that paid Dr. Marcus the most, 2017 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gary B. Marcus has 1 award and honors on record
Dmand AI lists 1 award for Dr. Marcus.
Awards and honors for Dr. Marcus
- Undated
- ACC Fellow
Source: Dmand AI Professional Profile Data
Dr. Gary B. Marcus graduated from University Of Cincinnati College Of Medicine
Dr. Marcus graduated from University Of Cincinnati College Of Medicine in 1962. Dr. Marcus is a member of ACC.
- Medical school
- Board certified in cardiovascular disease
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Gary B. Marcus accepts plans from 6 insurance carriers
Dr. Marcus is in network with 6 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- HCSC
- CMS Medicare
- Elevance
- Molina
Plan types Dr. Marcus accepts, by number of carriers
- Medicare5
- PPO3
- HMO2
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gary B. Marcus'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| 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. Gary B. Marcus
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. Gary B. Marcus' NPI number?
Dr. Gary B. Marcus' NPI number is 1073526646. It was assigned on August 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gary B. Marcus?
Dr. Gary B. Marcus is a cardiologist in Oakland, California. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. Gary B. Marcus practice?
Dr. Marcus practices at 3300 Webster St, Oakland, CA 94609. Dr. Marcus' primary practice is Hill Health' & 'Hill Health Medical Group in Oakland, California. Dmand AI also links Dr. Marcus to 1 physician office, 1 group practice or clinic and 1 medical group.
What is Dr. Gary B. Marcus' office phone number?
The practice phone on file for Dr. Marcus is (925) 327-6964.
What is Dr. Gary B. Marcus' medical license number?
Dr. Marcus' California license number on file is C28611.
Does Dr. Gary B. Marcus accept Medicare?
Yes. CMS data shows Dr. Marcus billed Medicare for 282 services in 2024, and Dr. Marcus accepts Medicare assignment.
How many Medicare patients does Dr. Gary B. Marcus see?
CMS counts 94 Medicare patients who saw Dr. Marcus in 2024, with an average age of 78.
Is Dr. Gary B. Marcus board certified?
Yes. Dr. Marcus is board certified in cardiovascular disease by the American Board of Internal Medicine.
What services does Dr. Gary B. Marcus bill to Medicare?
In 2024, Dr. Marcus' most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99215).
Where did Dr. Gary B. Marcus go to medical school?
Dr. Marcus graduated from University Of Cincinnati College Of Medicine in 1962.
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What drugs does Dr. Gary B. Marcus prescribe most?
In 2024 Medicare Part D data, Dr. Marcus' most prescribed drugs by claims were Atorvastatin Calcium, Metoprolol Succinate and Amlodipine Besylate.
Has Dr. Gary B. Marcus received payments from drug or device companies?
CMS Open Payments shows $360 in general payments to Dr. Marcus from 2 companies from 2017 to 2024. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. Gary B. Marcus been practicing?
Dr. Marcus graduated from medical school in 1962, 64 years ago.
What insurance does Dr. Gary B. Marcus accept?
Dr. Marcus is in network with 6 carriers, including Blue Cross Blue Shield of Michigan, Blue Cross Blue Shield of Massachusetts and HCSC. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
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