Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mark T Lin, MD

Individual provider Gastroenterology Physician · NPI 1366594749

Mark T Lin, MD practises Gastroenterology in Tucson, Arizona. Graduated from Rush Medical College of Rush University in 2004, 22 years ago. Practices with Tmc Medical Network, a 277-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Arizona and Missouri.

Years since qualifying
22
Trained at
Rush Medical College of Rush University
Licensed in
AZ, MO
In the registry since
2007
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1396 N Wilmot Rd
Tucson, AZ 85712-5132
Phone: (520) 420-2250
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1521 E Tangerine Rd Ste 123, Oro Valley, AZ 85755-6214 — (520) 901-6336

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 42987 (AZ)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 2008024820 (MO)

Record details

NPI number1366594749
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 17, 2007
Last updated in NPPESAugust 19, 2025
Certification dateAugust 19, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGASTROENTEROLOGY
Medical schoolRUSH MEDICAL COLLEGE OF RUSH UNIVERSITY
Graduated 2004 (22 years in practice)
Group practice Tmc Medical Network — 277 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 89 times · 77th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 77 times · 71st percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients897
Services billed 1,615 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $1,071 44 payments · a meal or drink at a meeting or visit, not a fee
Education $13 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Tmc Medical Network

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 277 clinicians in the practice; 12 are shown here.

Other providers in Tucson