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Gastroenterologists who accept Medicare in Knoxville, TN
CMS lists 39 clinicians in this specialty with a practice address in Knoxville. Accept Medicare assignment (the Medicare-approved amount as full payment): 39. Offer telehealth: 0.
Typical amounts Medicare approves in ZIP 37909 (2024 Medicare rates, the latest CMS has published): a new-patient visit $122, of which you pay about $30; a follow-up visit $94, of which you pay about $23 — the 20% coinsurance after the yearly Part B deductible. Clinicians who don't accept assignment can charge up to 15% more; with a Medicare Advantage plan, your plan's copay applies instead.
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Order: clinicians who accept assignment first, then by MIPS score (highest first), then by last name.
Shaker Barham, MD
✓ Accepts Medicare assignmentMIPS score (2024): 96.5/100Graduated 2013MaleOther offices in Knoxville: 2Drug and device company payments (2025): $3,743Mahmoud Bayoumi, MD
✓ Accepts Medicare assignmentMIPS score (2024): 96.5/100Graduated 2014MaleDrug and device company payments (2025): $2,435Sangeeta Gulati, MD
✓ Accepts Medicare assignmentMIPS score (2024): 96.5/100Graduated 1994 · East Tennessee State University Quillen College of MedicineFemaleDrug and device company payments (2025): $1,527Carlos A. Rollhauser, MD
✓ Accepts Medicare assignmentMIPS score (2024): 96.5/100Graduated 1988MaleDrug and device company payments (2025): $33,357Omar M. Tageldin
✓ Accepts Medicare assignmentMIPS score (2024): 96.5/100Graduated 2015MaleOther offices in Knoxville: 2Drug and device company payments (2025): $1,286Thomas L. Young, MD
✓ Accepts Medicare assignmentMIPS score (2024): 96.5/100Graduated 1979 · University of Tennessee, HSC, College of MedicineMaleDrug and device company payments (2025): $1,027Johnny Altawil, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2006MaleDrug and device company payments (2025): $440Steven J. Bindrim, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 1988 · New York Medical CollegeMaleDrug and device company payments (2025): $428Zachary A. Dickson, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2017 · University of Tennessee, HSC, College of MedicineMaleOther offices in Knoxville: 1Drug and device company payments (2025): $594William F. Ergen, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2012 · University of Tennessee, HSC, College of MedicineMaleOther offices in Knoxville: 1Drug and device company payments (2025): $735Jeffrey S. Gilbert, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2002 · University of Tennessee, HSC, College of MedicineMaleOther offices in Knoxville: 1Drug and device company payments (2025): $2,772John M. Haydek, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 1988 · Loyola University of Chicago, Stritch School of MedicineMaleOther offices in Knoxville: 1Drug and device company payments (2025): $239Jason L. Huffman, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2005 · Texas Tech University Health Science Center School of MedicineMaleOther offices in Knoxville: 1Drug and device company payments (2025): $587Hannah Jones, DO
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2014 · Lincoln Memorial University Medical DepartmentFemaleDrug and device company payments (2025): $217Tejal N. Mistry, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2015FemaleDrug and device company payments (2025): $1,081John M. Moore, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 2008 · East Tennessee State University Quillen College of MedicineMaleOther offices in Knoxville: 1Drug and device company payments (2025): $1,044Raj I. Narayani, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 1995 · Vanderbilt University School of MedicineMaleDrug and device company payments (2025): $50,764Maria B. Newman, MD
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 1994 · University of Puerto Rico School of MedicineFemaleOther offices in Knoxville: 1Drug and device company payments (2025): $1,506Ramanujan Samavedy
✓ Accepts Medicare assignmentMIPS score (2024): 90.7/100Graduated 1991MaleDrug and device company payments (2025): $1,072Mark D. Anderson, MD
✓ Accepts Medicare assignmentMIPS score (2024): 88.1/100Graduated 1984 · Vanderbilt University School of MedicineMaleDrug and device company payments (2025): $117Michael R. Ellis, MD
✓ Accepts Medicare assignmentMIPS score (2024): 88.1/100Graduated 1999 · Boston University School of MedicineMaleDrug and device company payments (2025): $920Siva Maran, MD
✓ Accepts Medicare assignmentMIPS score (2024): 88.1/100Graduated 1971MaleDrug and device company payments (2025): $368Harold S. Silver, MD
✓ Accepts Medicare assignmentMIPS score (2024): 88.1/100Graduated 1975MaleOther offices in Knoxville: 2Drug and device company payments (2025): $802Meade C. Edmunds, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.2/100Graduated 1988MaleDrug and device company payments (2025): $2,974Yeshaswini Panathur Sreenivasa Reddy, MD
✓ Accepts Medicare assignmentMIPS score (2024): 84.1/100Graduated 2015FemaleDrug and device company payments (2025): $693Gary A. Spiegelman, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100Graduated 1992 · Miami Medical CollegeMaleJuan Benitez, MD
✓ Accepts Medicare assignmentMIPS score (2024): 37.8/100Graduated 1983MaleRobert A. Pollack, MD
✓ Accepts Medicare assignmentMIPS score (2024): 24.9/100Graduated 1988 · University of South Florida College of MedicineMaleDrug and device company payments (2025): $482Jeffrey I. Brown, MD
✓ Accepts Medicare assignmentGraduated 1981 · University of Toledo College of MedicineMaleDrug and device company payments (2025): $447Dushyant S. Dahiya
✓ Accepts Medicare assignmentGraduated 2019MaleDrug and device company payments (2025): $408Ravi K. Ghanta, MD
✓ Accepts Medicare assignmentGraduated 1998MaleOther offices in Knoxville: 1Drug and device company payments (2025): $19Muhammed Iqbal, MD
✓ Accepts Medicare assignmentGraduated 1995 · East Tennessee State University Quillen College of MedicineMaleDrug and device company payments (2025): $180Kevin P. Meyers, MD
✓ Accepts Medicare assignmentGraduated 2007 · University of Texas Medical School at San AntonioMaleDrug and device company payments (2025): $665George B. Obeng, MD
✓ Accepts Medicare assignmentGraduated 2019MaleOther offices in Knoxville: 2Drug and device company payments (2025): $948Samuel C. Purkey, DO
✓ Accepts Medicare assignmentGraduated 2019MaleDrug and device company payments (2025): $2,014Dhruvil K. Radadiya, MD
✓ Accepts Medicare assignmentGraduated 2018MaleOther offices in Knoxville: 5Drug and device company payments (2025): $418Anabel Rodriguez Loya, DO
✓ Accepts Medicare assignmentGraduated 2018 · West Virginia School of Osteopathic MedicineFemaleDrug and device company payments (2025): $1,908Steedman A. Sarbah, MD
✓ Accepts Medicare assignmentGraduated 2000MaleLindsey C. Shipley, MD
✓ Accepts Medicare assignmentGraduated 2018 · East Tennessee State University Quillen College of MedicineFemaleOther offices in Knoxville: 1Drug and device company payments (2025): $405
Before you book
This list comes from Medicare's enrollment records, not from reviews. Call the office to confirm the clinician is taking new Medicare patients. With Original Medicare, a clinician who accepts assignment can only charge you the Medicare deductible and coinsurance; one who doesn't may charge up to 15% more than the Medicare-approved amount. If you have a Medicare Advantage plan, check that the clinician is in the plan's network.
The MIPS final score (0–100) comes from Medicare's Merit-based Incentive Payment System for 2024. It combines quality measures, cost, improvement activities and use of certified health records, and it sets a payment adjustment. Clinicians who report as a group share the group's score. It is not a patient rating, and many clinicians have no published score.
Payments from drug and medical device companies come from CMS Open Payments (2025 general payments: meals, travel, consulting and speaking fees, gifts and similar), summed for each clinician. Receiving payments is legal and common and does not mean a clinician did anything wrong.
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Enrollment, addresses and scores are as reported to CMS and can change. This is not a list of in-network providers for any Medicare Advantage plan, and it is not medical advice. Source: CMS Provider Data Catalog — Doctors and Clinicians National Downloadable File, Clinician MIPS Performance 2024 and Facility Affiliation Data (released Oct 2, 2026).