Adrenergic beta-AntagonistsAnti-Arrhythmia AgentsAnticoagulants
Dr. Gary E. Marais, MD
NPI1437103686
- Medicare services, 2020
- 26
- Part D claims, 2020
- 73
- Publications
- 2
- Industry payments
- $85
- Affiliated sites
- 1
- Practice address
- 2 W Fern Ave, Redlands, CA 92373-5916
- Practice phone
- Call (909) 793-3311
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Optum
Multi-specialty group site · Redlands, California
Find Dr. Marais' professional email, personal email and mobile number
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Dr. Gary E. Marais is a cardiologist in Alton, Illinois
Dr. Marais practices at Optum in Redlands, California.
Dr. Marais' NPI, 1437103686, was assigned on May 20, 2006. Dr. Marais graduated from Stellenbosch University Faculty of Medicine in 1973. Dr. Marais holds California license C41567.
NPI and contact details
- NPI
- 1437103686NPI Registry (opens in a new tab)
- NPI enumeration date
- May 20, 2006
- NPI status
- Active
- Practice phone
- (909) 793-3311
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1973
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gary E. Marais practices in Redlands and Alton
Dr. Marais' primary practice is Optum, at 2 W Fern Ave, Redlands, CA 92373-5916. The practice phone is (909) 793-3311. The NPI Registry lists Dr. Marais' practice address as 1 Memorial Dr, Alton, IL 62002.
- OptumPrimary2 W Fern Ave, Redlands, CA 92373-5916Phone(909) 793-3311
- NPI Registry address1 Memorial Dr, Alton, IL 62002 · Madison CountyPhone(909) 793-3311
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Gary E. Marais is affiliated with 1 site of care and 1 medical group
Dr. Marais' primary practice is Optum in Redlands, California. The medical group on file is Beaver Medical Group.
OptumPrimary
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Gary E. Marais' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marais practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Optum | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gary E. Marais is one of 908 cardiologists in Illinois
Cardiovascular disease is Dr. Marais' primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Marais is board certified in cardiovascular disease by the American Board of Internal Medicine. Dr. Marais is licensed in California.
Specialties and state licenses
- Cardiovascular disease, CaliforniaPrimary
Cardiologists near Dr. Marais
Counts of cardiologists with a Dmand AI profile, by place and practice. Each opens the list.
908cardiologists in Illinois
4cardiologists in Alton
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gary E. Marais billed Medicare for 26 services in 2020
CMS data shows 26 Medicare services from Dr. Marais across 1 procedure code in 2020. Medicare paid $1,618 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202026
Paid by Medicare$1,618
Procedure codes1
Dr. Marais' Medicare services by type, 2019 to 2020
- 2019
- 2020
- Tests and treatments
- 2019: 3462020: 2692%
- Office and hospital visits
- 2019: 1452020: 0100%
Dr. Marais compared with the Illinois median for cardiologists, 2020
- Dr. Marais
- Illinois median
- Medicare services
- 26vs 1,93699% below
- Part D claims
- 73vs 1,50295% below
Medians across 906 cardiologists in Illinois with Dmand AI profiles that report each measure.
Dr. Marais' most billed Medicare procedure codes, 2020
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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marais and other cardiologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gary E. Marais' patients have a median age of 74
Across all payers, Dmand AI patient panel data puts Dr. Marais' median patient age at 74, with 41% women.
Dr. Marais' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women41%
- Men55%
Source: Dmand AI Patient Panel Data
Dr. Gary E. Marais wrote 73 Medicare Part D claims in 2020
In 2020, Dr. Marais wrote 73 Medicare Part D claims. They cover 5 drugs, with $16,688 in total drug cost. In 2019, CMS named 842 claims across 27 drugs.
Part D claims, 202073
Drugs named by CMS5
Total drug cost$16,688
Dr. Marais' most prescribed drugs by claims, 2020
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, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 8422020: 7391%
Drugs named by CMS: 5 in 2020, 27 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Gary E. Marais has 2 publications on record
Dmand AI links 2 papers to Dr. Marais.
Papers2
Recent publications by Dr. Marais
See who Dr. Marais researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Marais 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. Gary E. Marais received $85 in industry payments from 2016 to 2019
CMS Open Payments shows 4 general payments to Dr. Marais from 2 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $65.
General payments to Dr. Marais by program year, 2016 to 2019
Companies that paid Dr. Marais the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gary E. Marais graduated from Stellenbosch University Faculty of Medicine
Dr. Marais graduated from Stellenbosch University Faculty of Medicine in 1973.
- Medical school
- Board certified in cardiovascular disease
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Gary E. Marais accepts plans from 1 insurance carrier
Dr. Marais is in network with 1 carrier, including Excellus BlueCross BlueShield. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Excellus BlueCross BlueShield
Plan types Dr. Marais accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Gary E. Marais'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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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) |
| 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. Gary E. Marais
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 E. Marais' NPI number?
Dr. Gary E. Marais' NPI number is 1437103686. It was assigned on May 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gary E. Marais?
Dr. Gary E. Marais is a cardiologist in Alton, Illinois. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. Gary E. Marais practice?
Dr. Marais practices at 2 W Fern Ave, Redlands, CA 92373-5916. Dr. Marais also practices at 1 Memorial Dr, Alton, IL 62002. Dr. Marais' primary practice is Optum in Redlands, California.
What is Dr. Gary E. Marais' office phone number?
The practice phone on file for Dr. Marais is (909) 793-3311.
What is Dr. Gary E. Marais' medical license number?
Dr. Marais holds California license C41567.
What medical group is Dr. Gary E. Marais part of?
Dr. Marais is linked to Beaver Medical Group.
Does Dr. Gary E. Marais accept Medicare?
Yes. CMS data shows Dr. Marais billed Medicare for 26 services in 2020.
Is Dr. Gary E. Marais board certified?
Yes. Dr. Marais is board certified in cardiovascular disease by the American Board of Internal Medicine.
What services does Dr. Gary E. Marais bill to Medicare?
In 2020, Dr. Marais' most billed Medicare services were heart test or procedure (93306).
Where did Dr. Gary E. Marais go to medical school?
Dr. Marais graduated from Stellenbosch University Faculty of Medicine in 1973.
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What drugs does Dr. Gary E. Marais prescribe most?
In 2020 Medicare Part D data, Dr. Marais' most prescribed drugs by claims were Eliquis, Atorvastatin Calcium and Spironolactone.
Has Dr. Gary E. Marais received payments from drug or device companies?
CMS Open Payments shows $85 in general payments to Dr. Marais from 2 companies from 2016 to 2019. The largest total came from Boston Scientific Corporation.
How long has Dr. Gary E. Marais been practicing?
Dr. Marais graduated from medical school in 1973, 53 years ago.
Does Dr. Gary E. Marais do research?
Dmand AI links 2 publications to Dr. Marais.
What insurance does Dr. Gary E. Marais accept?
Dr. Marais is in network with 1 carrier, including Excellus BlueCross BlueShield. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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