Dr. George Leonard Marks, MD
- Medicare services, 2024
- 603
- Medicare patients, 2024
- 150
- Part D claims, 2024
- 739
- Industry payments
- $3,440
- Medical group
- 1
- Practice address
- 12021 S Wilmington Ave, Room 1059, Los Angeles, CA 90059-3019
- Practice phone
- Call (310) 668-5201
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Martin Luther King, Jr. Outpatient Center
Ambulatory surgical center (non-certified) · Los Angeles, California
Find Dr. Marks' 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. George Leonard Marks is an internist in Los Angeles, California
Dr. Marks practices at Martin Luther King, Jr. Outpatient Center in Los Angeles, California.
Dr. Marks' NPI, 1578589602, was assigned on July 14, 2006. Dr. Marks graduated from Perelman School of Medicine - Philadelphia in 1976. Dr. Marks holds California license C39879.
- NPI
- 1578589602NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6800852344
- NPI enumeration date
- July 14, 2006
- NPI status
- Active
- Practice phone
- (310) 668-5201
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 76
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. George Leonard Marks practices at Martin Luther King, Jr. Outpatient Center in Los Angeles, California
Dr. Marks' primary practice is Martin Luther King, Jr. Outpatient Center, at 12021 S Wilmington Ave, Room 1059, Los Angeles, CA 90059-3019. The practice phone is (310) 668-5201.
- Martin Luther King, Jr. Outpatient Center12021 S Wilmington Ave, Room 1059, Los Angeles, CA 90059-3019Phone(310) 668-5201
Source: Doctors and Clinicians National Downloadable File (CMS)
Dr. George Leonard Marks is affiliated with 1 site of care and 1 medical group
Dr. Marks' primary practice is Martin Luther King, Jr. Outpatient Center in Los Angeles, California. The medical group on file is Harbor-UCLA Medical Center.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. George Leonard Marks' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marks practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Martin Luther King, Jr. Outpatient Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. George Leonard Marks is one of 16,751 internists in California
Internal medicine is Dr. Marks' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Marks' licenses on file in 2 states: California and Virginia.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Virginia license
Clinical focus
Dmand AI lists acute mini-stroke (TIA), aneurysm, atrial fibrillation and flutter, cardiomyopathy, chronic diabetes, chronic hypertension, coronary artery disease and endocarditis among the conditions Dr. Marks treats.
Internists near Dr. Marks
Counts of internists 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. George Leonard Marks billed Medicare for 603 services in 2024
CMS data shows 603 Medicare services from Dr. Marks across 6 procedure codes in 2024, for 150 Medicare patients. Medicare paid $24,523 for them. Every service was in an office.
Dr. Marks' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2052024: 32358%
- Tests and treatments
- 2023: 1812024: 26647%
- Surgery
- 2023: 232024: 1439%
- Lab and pathology
- 2023: 322024: 0100%
Dr. Marks compared with the California median for internists, 2024
- Dr. Marks
- California median
- Medicare services
- 603vs 36167% above
- Medicare patients
- 150vs 151Close to median
- Part D claims
- 532vs 42126% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Marks' 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. Marks?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Marks and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. George Leonard Marks treated 150 Medicare patients in 2024, average age 71
CMS counts 150 Medicare patients who saw Dr. Marks in 2024. The largest group is 65 to 74, with 93 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.79, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Marks' median patient age at 63, with 42% women.
Dr. Marks' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Marks' Medicare patients by sex, 2024
- Women6845%
- Men8255%
Chronic conditions among Dr. Marks' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes64%
- Heart failure51%
- Ischemic heart disease48%
- Chronic kidney disease46%
- Arthritis40%
- Atrial fibrillation34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marks' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women42%
- Men58%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. George Leonard Marks wrote 739 Medicare Part D claims in 2024
In 2024, Dr. Marks wrote 739 Medicare Part D claims for 94 patients. 86% of them were for generic drugs. CMS names the drug for 532 of them, across 19 drugs with 11 or more claims each, at $81,337 in total drug cost. In 2023, CMS named 565 claims across 16 drugs.
Dr. Marks' Part D claims by kind of drug, 2024
- Generic633 claims86%
- Brand-name and other106 claims14%
Dr. Marks' 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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5652024: 5326%
Drugs named by CMS: 19 in 2024, 16 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
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Dr. George Leonard Marks received $3,440 in industry payments from 2016 to 2025
CMS Open Payments shows 126 general payments to Dr. Marks from 19 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. ZOLL Services LLC (A/K/A ZOLL LifeCor Corp) paid the most, $888.
General payments to Dr. Marks by program year, 2016 to 2025
Companies that paid Dr. Marks 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. George Leonard Marks graduated from Perelman School of Medicine - Philadelphia
Dr. Marks graduated from Perelman School of Medicine - Philadelphia in 1976.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. George Leonard Marks accepts plans from 2 insurance carriers
Dr. Marks is in network with 2 carriers, including LA Care and CMS Medicare. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- LA Care
- CMS Medicare
Plan types Dr. Marks accepts, by number of carriers
- HMO1
- Medicaid1
- Medicare1
Source: Dmand AI Insurance Network Data
Sources for Dr. George Leonard Marks'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 | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand 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) |
| 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. George Leonard Marks
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. George Leonard Marks' NPI number?
Dr. George Leonard Marks' NPI number is 1578589602. It was assigned on July 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. George Leonard Marks?
Dr. George Leonard Marks is an internist in Los Angeles, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. George Leonard Marks practice?
Dr. Marks practices at 12021 S Wilmington Ave, Room 1059, Los Angeles, CA 90059-3019. Dr. Marks' primary practice is Martin Luther King, Jr. Outpatient Center in Los Angeles, California.
What is Dr. George Leonard Marks' office phone number?
The practice phone on file for Dr. Marks is (310) 668-5201.
What is Dr. George Leonard Marks' medical license number?
Dr. Marks holds California license C39879, one of the licenses on file in 2 states.
Which states has Dr. George Leonard Marks been licensed in?
Dmand AI has state licenses on file for Dr. Marks in California (1981 to 2026) and Virginia (1978 to 2004).
What medical group is Dr. George Leonard Marks part of?
Dr. Marks is linked to Harbor-UCLA Medical Center.
Does Dr. George Leonard Marks accept Medicare?
Yes. CMS data shows Dr. Marks billed Medicare for 603 services in 2024.
How many Medicare patients does Dr. George Leonard Marks see?
CMS counts 150 Medicare patients who saw Dr. Marks in 2024, with an average age of 71.
What services does Dr. George Leonard Marks bill to Medicare?
In 2024, Dr. Marks' most billed Medicare services were office visit, established patient (99213), heart test or procedure (93005) and office visit, established patient (99212).
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Where did Dr. George Leonard Marks go to medical school?
Dr. Marks graduated from Perelman School of Medicine - Philadelphia in 1976.
What drugs does Dr. George Leonard Marks prescribe most?
In 2024 Medicare Part D data, Dr. Marks' most prescribed drugs by claims were Metoprolol Tartrate, Atorvastatin Calcium and Carvedilol.
Has Dr. George Leonard Marks received payments from drug or device companies?
CMS Open Payments shows $3,440 in general payments to Dr. Marks from 19 companies from 2016 to 2025. The largest total came from ZOLL Services LLC (A/K/A ZOLL LifeCor Corp).
How long has Dr. George Leonard Marks been practicing?
Dr. Marks graduated from medical school in 1976, 50 years ago.
What insurance does Dr. George Leonard Marks accept?
Dr. Marks is in network with 2 carriers, including LA Care and CMS Medicare. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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