James Mark Lin, M.D.
Gastroenterology Physician · Pleasanton, CA
James Mark Lin, M.D. is a gastroenterology physician with a practice address in Pleasanton, California, and NPI 1396864872, issued on Mar 28, 2007. Check the license (California A102814, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Mark Lin
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- A102814 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5565 W Las Positas Blvd Ste 200, Pleasanton, CA 94588
- Phone
- (650) 736-5555
- Enumerated
- Mar 28, 2007
- Record last updated
- Apr 12, 2024
- Medicare enrollment
- Enrolled (PECOS I20110719000134); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2005
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify James Mark Lin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A102814Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average gastroenterology physician in 2024
1,974 Medicare Part D claims for 670 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims.
Most prescribed
- Pantoprazole Sodium576 claims
- Sod Sulf-Potass Sulf-Mag Sulf238 claims
- Colesevelam Hcl99 claims
- Linzess96 claims
- Sucralfate78 claims
- Omeprazole69 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
James Mark Lin among 2,140 gastroenterology physician records in California
James Mark Lin, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 52% of them.
- NPI issued2007 · 52% of these records are older, 37% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2005 · median 2002 among the 1,538 with a school on file
- Record last updated2024 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Pleasanton → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Eric Rowen, M.D.Pleasanton, CA 945881891883583
- Harpriya Singh, MDPleasanton, CA 945881699919100
- Phillip Wolfe, M.D.Pleasanton, CA 945881710075411
- Thomas Cuff, MDVallejo, CA 945891538247101
- Marcus Juan Esteban, M.D.Vallejo, CA 945891922455864
- Aaron Levy, MDVallejo, CA 945891891873790
- Ralston Martin, MDVallejo, CA 945891942388780
- Pauline Mysliwiec, MDVallejo, CA 945891588716708
Common questions
What is James Mark Lin, M.D.'s NPI number?
James Mark Lin, M.D.'s National Provider Identifier (NPI) is 1396864872, issued on Mar 28, 2007. An NPI identifies a provider in billing; it is not a license.
Where is James Mark Lin, M.D. located?
The NPPES record lists a practice address at 5565 W Las Positas Blvd Ste 200, Pleasanton, CA, 94588. Phone: (650) 736-5555. Providers update this record themselves, so call before visiting.
How can I verify James Mark Lin, M.D.'s license?
NPPES lists California license number A102814, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does James Mark Lin, M.D. prescribe under Medicare Part D?
In 2024, James Mark Lin, M.D. had 1,974 Medicare Part D claims for 670 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.