Menopause
BileCholelithiasisCholesterol
Dr. Jay W. Marks, MD
NPI1003871914
- Medicare services, 2018
- 174
- Part D claims, 2024
- 45
- Publications
- 29
- Industry payments
- $287
- Insurance carriers
- 1
- Practice address
- 8635 W 3rd St, Los Angeles, CA 90048-6101
- Practice phone
- Call (323) 469-4499
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
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Dr. Jay W. Marks is a gastroenterologist in Los Angeles, California
Dr. Marks practices in Los Angeles, California.
Dr. Marks' NPI, 1003871914, was assigned on April 20, 2006. Dr. Marks graduated from Yale School of Medicine in 1970. Dr. Marks holds California license G21318.
NPI and contact details
- NPI
- 1003871914NPI Registry (opens in a new tab)
- NPI enumeration date
- April 20, 2006
- NPI status
- Active
- Practice phone
- (323) 469-4499
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1970
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Jay W. Marks' practice address is in Los Angeles, California
Dr. Marks' practice address in the NPI Registry is 8635 W 3rd St, Los Angeles, CA 90048-6101. The practice phone is (323) 469-4499.
- NPI Registry address8635 W 3rd St, Los Angeles, CA 90048-6101Phone(323) 469-4499
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Jay W. 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 |
|---|---|
| Dr. Marks' practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jay W. Marks is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Marks' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Marks is board certified in gastroenterology by the American Board of Internal Medicine. Dr. Marks is licensed in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Marks
Counts of gastroenterologists 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. Jay W. Marks billed Medicare for 174 services in 2018
CMS data shows 174 Medicare services from Dr. Marks across 3 procedure codes in 2018. Medicare paid $13,929 for them. Every service was in an office.
Medicare services, 2018174
Paid by Medicare$13,929
Procedure codes3
Dr. Marks' Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 1112018: 8920%
- Tests and treatments
- 2017: 1162018: 8527%
Dr. Marks compared with the California median for gastroenterologists, 2018
- Dr. Marks
- California median
- Medicare services
- 174vs 58670% below
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Marks' most billed Medicare procedure codes, 2018
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 gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jay W. Marks' patients have a median age of 55
Across all payers, Dmand AI patient panel data puts Dr. Marks' median patient age at 55, with 50% women.
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 55
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
Dr. Jay W. Marks wrote 45 Medicare Part D claims in 2024
In 2024, Dr. Marks wrote 45 Medicare Part D claims. 71% of them were for generic drugs.
Part D claims, 202445
Dr. Marks' Part D claims by kind of drug, 2024
- Generic32 claims71%
- Brand-name13 claims29%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
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Dr. Jay W. Marks has 29 publications on record
Dmand AI links 29 papers to Dr. Marks. The most frequent topics are Cholelithiasis, Bile and Chenodeoxycholic Acid. Dr. Marks has published most often in Gastroenterology. Dr. Marks' most frequent co-authors are Paul G. Frenkiel, MD and Hooshang Meshkinpour, MD.
Papers29
Topics Dr. Marks writes about most
- Cholelithiasis
- Bile
- Chenodeoxycholic Acid
- Cholesterol
- Double-Blind Method
- Ursodeoxycholic Acid
- Bile Acids and Salts
- Crystallization
Dr. Marks' most frequent co-authors
Recent publications by Dr. Marks
AspirinBileCholelithiasis
Ann Intern Med
Chenodeoxycholic AcidCholecystographyCholelithiasis
Am J Med Sci
Chenodeoxycholic AcidCholagogues and CholereticsCholelithiasis
See who Dr. Marks researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Marks works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Jay W. Marks received $287 in industry payments from 2016 to 2018
CMS Open Payments shows 17 general payments to Dr. Marks from 11 drug and device companies from 2016 to 2018. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $78.
General payments to Dr. Marks by program year, 2016 to 2018
Companies that paid Dr. Marks the most, 2016 to 2018
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jay W. Marks graduated from Yale School of Medicine
Dr. Marks graduated from Yale School of Medicine in 1970.
- Medical school
- Board certified in gastroenterology
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Jay W. Marks accepts plans from 1 insurance carrier
Dr. Marks is in network with 1 carrier, including Humana. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Humana
Plan types Dr. Marks accepts, by number of carriers
- Medicare1
- PPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Jay W. 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice 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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (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. Jay W. 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. Jay W. Marks' NPI number?
Dr. Jay W. Marks' NPI number is 1003871914. It was assigned on April 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Jay W. Marks?
Dr. Jay W. Marks is a gastroenterologist in Los Angeles, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Jay W. Marks practice?
Dr. Marks practices at 8635 W 3rd St, Los Angeles, CA 90048-6101.
What is Dr. Jay W. Marks' office phone number?
The practice phone on file for Dr. Marks is (323) 469-4499.
What is Dr. Jay W. Marks' medical license number?
Dr. Marks holds California license G21318.
Does Dr. Jay W. Marks accept Medicare?
Yes. CMS data shows Dr. Marks billed Medicare for 174 services in 2018.
Is Dr. Jay W. Marks board certified?
Yes. Dr. Marks is board certified in gastroenterology by the American Board of Internal Medicine.
What services does Dr. Jay W. Marks bill to Medicare?
In 2018, Dr. Marks' most billed Medicare services were digestive system test (91065), office visit, new patient (99203) and office visit, established patient (99214).
Where did Dr. Jay W. Marks go to medical school?
Dr. Marks graduated from Yale School of Medicine in 1970.
Has Dr. Jay W. Marks received payments from drug or device companies?
CMS Open Payments shows $287 in general payments to Dr. Marks from 11 companies from 2016 to 2018. The largest total came from Abbvie Inc.
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How long has Dr. Jay W. Marks been practicing?
Dr. Marks graduated from medical school in 1970, 56 years ago.
Does Dr. Jay W. Marks do research?
Dmand AI links 29 publications to Dr. Marks.
Who does Dr. Jay W. Marks publish with?
Dr. Marks' most frequent co-authors are Paul G. Frenkiel, MD (1 shared paper) and Hooshang Meshkinpour, MD (1 shared paper).
What insurance does Dr. Jay W. Marks accept?
Dr. Marks is in network with 1 carrier, including Humana. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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