Dr. Robert J. Marx, MD
- Medicare services, 2024
- 836
- Medicare patients, 2026
- 163
- Part D claims, 2026
- 1,291
- Hospital affiliations
- 3
- Industry payments
- $3,829
- Practice address
- 225 N Jackson Avenue, San Jose, CA 95116
- Practice phone
- Call (408) 259-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Marx'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. Robert J. Marx is a general practice physician in San Jose, California
Dr. Marx practices at Regional Medical Center in San Jose, California, part of County of Santa Clara, CA.
Dr. Marx's NPI, 1073576351, was assigned on April 8, 2006. Dr. Marx graduated from The Johns Hopkins University School of Medicine in 1975. Dr. Marx holds California license A30254.
- NPI
- 1073576351NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9133243983
- NPI enumeration date
- April 8, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (408) 259-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 77
- Medical school graduation
- 1975
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Robert J. Marx practices at Regional Medical Center in San Jose, California
Dr. Marx's primary practice is Regional Medical Center, at 225 N Jackson Avenue, San Jose, CA 95116 in Santa Clara County. The practice phone is (408) 259-5000.
- Regional Medical Center225 N Jackson Avenue, San Jose, CA 95116 · Santa Clara CountyPhone(408) 259-5000
Source: Dmand AI Affiliation Data
Dr. Robert J. Marx is affiliated with 3 sites of care
Dr. Marx's primary practice is Regional Medical Center in San Jose, California, part of County of Santa Clara, CA. Dr. Marx is also affiliated with Good Samaritan Hospital. Dmand AI also links Dr. Marx to 1 more hospital, 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 J. Marx's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marx practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Regional Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert J. Marx is one of 1,526 general practice physicians in California
General practice is Dr. Marx's primary specialty in the NPI Registry, under taxonomy code 208D00000X. Dr. Marx is licensed in California.
Specialties and state licenses
- General practice, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute sinusitis, acute skin infection, adjustment disease, aneurysm, arthritis, asthma and atrial fibrillation and flutter among the conditions Dr. Marx treats.
General practice physicians near Dr. Marx
Counts of general practice 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
Dr. Robert J. Marx billed Medicare for 836 services in 2024
CMS data shows 836 Medicare services from Dr. Marx across 7 procedure codes in 2024, for 163 Medicare patients. Medicare paid $59,554 for them. Every service was in an office.
Dr. Marx's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4772024: 4882%
- Other services
- 2023: 2482024: 22111%
- Tests and treatments
- 2023: 1462024: 12713%
Dr. Marx compared with the California median for general practice physicians, 2024
- Dr. Marx
- California median
- Medicare services
- 836vs 2623.2 times
- Medicare patients
- 163vs 13620% above
- Part D claims
- 1,028vs 1925.4 times
Medians across 1,114 general practice physicians in California with Dmand AI profiles that report each measure.
Dr. Marx's 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. Marx?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marx and other general practice physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert J. Marx treated 163 Medicare patients in 2026, average age 73
CMS counts 163 Medicare patients who saw Dr. Marx in 2026. The largest group is 65 to 74, with 105 patients. 75% of them have high cholesterol, and 71% have high blood pressure. Their average risk score is 0.76, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Marx's median patient age at 58, with 35% women.
Dr. Marx's Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
Dr. Marx's Medicare patients by sex, 2026
- Women6842%
- Men9558%
Chronic conditions among Dr. Marx's Medicare patients, 2026
- High cholesterol75%
- High blood pressure71%
- Arthritis28%
- Ischemic heart disease18%
- Diabetes17%
- Chronic kidney disease12%
- Osteoporosis12%
- Atrial fibrillation10%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marx's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 58
Patient panel by sex, all payers
- Women35%
- Men64%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
Dr. Robert J. Marx wrote 1,291 Medicare Part D claims in 2026
In 2026, Dr. Marx wrote 1,291 Medicare Part D claims for 163 patients. 93% of them were for generic drugs. CMS names the drug for 1,028 of them, across 23 drugs with 11 or more claims each, at $9,109 in total drug cost. In 2023, CMS named 1,079 claims across 27 drugs.
Dr. Marx's Part D claims by kind of drug, 2026
- Generic1,206 claims93%
- Brand-name and other85 claims7%
Dr. Marx's 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. Marx's Part D claims, 2026
- Antibiotics5%62 of 1,291 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: 1,0792024: 1,0285%
Drugs named by CMS: 23 in 2024, 27 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), 2026 data
Dr. Robert J. Marx offers telehealth to Medicare patients
Dr. Marx accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Marx as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Robert J. Marx received $3,829 in industry payments from 2016 to 2025
CMS Open Payments shows 41 general payments to Dr. Marx from 9 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $2,709.
General payments to Dr. Marx by program year, 2016 to 2025
General payments to Dr. Marx by kind, 2016 to 2025
- Food and beverage$3,812100%
- Education$170%
Companies that paid Dr. Marx the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert J. Marx graduated from The Johns Hopkins University School of Medicine
Dr. Marx graduated from The Johns Hopkins University School of Medicine in 1975.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Robert J. Marx accepts plans from 14 insurance carriers
Dr. Marx is in network with 14 carriers, including Elevance, Aetna and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Elevance
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Blue Cross Blue Shield of Massachusetts
- Alliant Health Plans
- Aspirus Health Plan
- +6 more carriersWith a free account
Plan types Dr. Marx accepts, by number of carriers
- Medicare8
- PPO8
- HMO6
- POS5
- EPO4
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Robert J. Marx'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) |
| 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. Robert J. Marx
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 J. Marx's NPI number?
Dr. Robert J. Marx's NPI number is 1073576351. It was assigned on April 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert J. Marx?
Dr. Robert J. Marx is a general practice physician in San Jose, California. The primary specialty in the NPI Registry is General Practice Physician (taxonomy code 208D00000X).
Where does Dr. Robert J. Marx practice?
Dr. Marx practices at 225 N Jackson Avenue, San Jose, CA 95116. Dr. Marx's primary practice is Regional Medical Center in San Jose, California, part of County of Santa Clara, CA. Dmand AI also links Dr. Marx to 1 hospital, and a free account names each one.
What is Dr. Robert J. Marx's office phone number?
The practice phone on file for Dr. Marx is (408) 259-5000. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Robert J. Marx's email address?
Dmand AI checks professional and personal email addresses for Dr. Marx through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Robert J. Marx's medical license number?
Dr. Marx holds California license A30254.
Which hospitals is Dr. Robert J. Marx affiliated with?
Dr. Marx practices at Regional Medical Center in San Jose, California. Dr. Marx is also affiliated with Good Samaritan Hospital. Dmand AI links Dr. Marx to 1 more hospital, named with a free account.
Does Dr. Robert J. Marx accept Medicare?
Yes. CMS data shows Dr. Marx billed Medicare for 836 services in 2024, and Dr. Marx accepts Medicare assignment.
Does Dr. Robert J. Marx offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Marx as offering telehealth services.
How many Medicare patients does Dr. Robert J. Marx see?
CMS counts 163 Medicare patients who saw Dr. Marx in 2026, with an average age of 73.
Show 7 more questionsShow fewer questions
What services does Dr. Robert J. Marx bill to Medicare?
In 2024, Dr. Marx's most billed Medicare services were office visit, established patient (99213), medicare service (G0439) and heart test or procedure (93000).
Where did Dr. Robert J. Marx go to medical school?
Dr. Marx graduated from The Johns Hopkins University School of Medicine in 1975.
What drugs does Dr. Robert J. Marx prescribe most?
In 2024 Medicare Part D data, Dr. Marx's most prescribed drugs by claims were Atorvastatin Calcium, Losartan Potassium and Benazepril HCl.
Has Dr. Robert J. Marx received payments from drug or device companies?
CMS Open Payments shows $3,829 in general payments to Dr. Marx from 9 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Robert J. Marx been practicing?
Dr. Marx graduated from medical school in 1975, 51 years ago.
What EHR does Dr. Robert J. Marx's practice use?
Dmand AI tracks the EHR system at Regional Medical Center and at 2 more affiliated sites. The vendor and product are available with a free Dmand AI account.
What insurance does Dr. Robert J. Marx accept?
Dr. Marx is in network with 14 carriers, including Elevance, Aetna and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit. The full carrier list is available with a free Dmand AI account.
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