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Gastroenterologists who accept Medicare in Denison, TX
CMS lists 4 clinicians in this specialty with a practice address in Denison. Accept Medicare assignment (the Medicare-approved amount as full payment): 4. Offer telehealth: 0.
Typical amounts Medicare approves in ZIP 75020 (2024 Medicare rates, the latest CMS has published): a new-patient visit $126, of which you pay about $32; a follow-up visit $97, of which you pay about $24 — 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.
Onpan Cheung, MD
✓ Accepts Medicare assignmentGraduated 2003FemaleDrug and device company payments (2025): $278Nhat Q. Nguyen, MD
✓ Accepts Medicare assignmentGraduated 2007MaleDrug and device company payments (2025): $690Karthik Ragunathan, MD
✓ Accepts Medicare assignmentGraduated 2011MaleDrug and device company payments (2025): $43Tung T. Tran, MD
✓ Accepts Medicare assignmentGraduated 2001 · Baylor College of MedicineMaleDrug and device company payments (2025): $24,157
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.
Other specialists in Denison
- Primary care doctors99
- Nurse practitioners52
- Cardiologists6
- Dermatologists4
- Orthopedic surgeons4
- Neurologists7
- Optometrists4
- Podiatrists5
- Pulmonologists5
- Nephrologists9
- ENT doctors3
- Oncologists7
- Therapists and counselors22
- Physical therapists8
- Chiropractors6
- Gynecologists3
- General surgeons6
- Vascular surgeons3
- Allergists3
- Neurosurgeons3
Other care in Denison
Hospitals · Nursing homes · Dialysis centers · Home health agencies · Hospices
Nearby cities
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).