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Gastroenterologists who accept Medicare in Grand Junction, CO
CMS lists 7 clinicians in this specialty with a practice address in Grand Junction. Accept Medicare assignment (the Medicare-approved amount as full payment): 7. Offer telehealth: 1.
Typical amounts Medicare approves in ZIP 81505 (2024 Medicare rates, the latest CMS has published): a new-patient visit $133, of which you pay about $33; a follow-up visit $102, of which you pay about $26 — 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.
Ellen A. Dy, MD
✓ Accepts Medicare assignmentMIPS score (2024): 98.1/100Graduated 1988 · Indiana University School of MedicineFemaleDrug and device company payments (2025): $1,195Michael G. Harris, DO
✓ Accepts Medicare assignmentMIPS score (2024): 98.1/100Graduated 2017 · Kansas City University of Physicians and SurgeonsMaleDrug and device company payments (2025): $159Brent J. Prosser, MD
✓ Accepts Medicare assignmentMIPS score (2024): 98.1/100Graduated 2001 · University of Colorado School of Medicine, DenverMaleDrug and device company payments (2025): $486Philip H. Sarges, MD
✓ Accepts Medicare assignmentMIPS score (2024): 98.1/100Graduated 2009 · Tufts University School of MedicineMaleDrug and device company payments (2025): $1,741William Shields, DO
✓ Accepts Medicare assignmentMIPS score (2024): 98.1/100Graduated 2001 · Kansas City University of Physicians and SurgeonsMaleDrug and device company payments (2025): $184George Winters III, MD
✓ Accepts Medicare assignmentMIPS score (2024): 98.1/100Graduated 1993MaleDrug and device company payments (2025): $1,514Masi Khaja, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 1999MaleDrug and device company payments (2025): $2,835
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 Grand Junction
- Primary care doctors144
- Nurse practitioners162
- Cardiologists24
- Dermatologists20
- Orthopedic surgeons18
- Neurologists11
- Ophthalmologists12
- Optometrists21
- Podiatrists6
- Urologists10
- Pulmonologists7
- Nephrologists5
- ENT doctors8
- Oncologists15
- Psychiatrists12
- Psychologists13
- Therapists and counselors102
- Physical therapists32
- Occupational therapists4
- Audiologists16
- Chiropractors22
- Gynecologists20
- General surgeons20
- Vascular surgeons10
- Physiatrists8
- Dietitians5
- Neurosurgeons5
- Infectious disease doctors4
Other care in Grand Junction
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).