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Gastroenterologists who accept Medicare in Littleton, CO
CMS lists 11 clinicians in this specialty with a practice address in Littleton. Accept Medicare assignment (the Medicare-approved amount as full payment): 11. Offer telehealth: 2.
Typical amounts Medicare approves in ZIP 80122 (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.
Frederick Harris
✓ Accepts Medicare assignmentMIPS score (2024): 100/100Graduated 2007 · University of Tennessee, HSC, College of MedicineMaleDrug and device company payments (2025): $2,248Douglas G. Adler, MD
✓ Accepts Medicare assignmentMIPS score (2024): 86/100✓ TelehealthGraduated 1995MaleDrug and device company payments (2025): $75,711Ariana W. Greenwood, MD
✓ Accepts Medicare assignmentMIPS score (2024): 86/100✓ TelehealthGraduated 2006 · University of Vermont College of MedicineFemaleDrug and device company payments (2025): $1,595Ryan R. McWilliams, MD
✓ Accepts Medicare assignmentMIPS score (2024): 86/100Graduated 2008 · University of Colorado School of Medicine, DenverMaleDrug and device company payments (2025): $633Thomas C. Welton, MD
✓ Accepts Medicare assignmentMIPS score (2024): 86/100Graduated 1988 · Kansas City College of Medicine and SurgeryMaleDrug and device company payments (2025): $192Jennifer W. Brenner, MD
✓ Accepts Medicare assignmentGraduated 2003FemaleDrug and device company payments (2025): $662Carlene L. Chun, MD
✓ Accepts Medicare assignmentGraduated 2012 · Stanford University School of MedicineFemaleDrug and device company payments (2025): $1,352Luke T. Evans, MD
✓ Accepts Medicare assignmentGraduated 1999 · University of Kansas School of Med (kc/wich/sal)MaleDrug and device company payments (2025): $1,396James Y. Rhee, MD
✓ Accepts Medicare assignmentGraduated 1997 · University of Michigan Medical SchoolMaleDrug and device company payments (2025): $1,314Erik W. Springer, MD
✓ Accepts Medicare assignmentGraduated 1998 · Rutgers R W Johnson Medical School (cam/new Bruns/pisc)MaleDrug and device company payments (2025): $2,233Amanda N. Sullivan, DO
✓ Accepts Medicare assignmentGraduated 2017 · University of Pikeville, Kentucky College of Osteopathic MedFemaleDrug and device company payments (2025): $1,315
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 Littleton
- Primary care doctors124
- Nurse practitioners209
- Cardiologists33
- Dermatologists13
- Orthopedic surgeons18
- Neurologists10
- Ophthalmologists12
- Optometrists35
- Podiatrists13
- Urologists16
- ENT doctors6
- Oncologists11
- Psychiatrists37
- Psychologists23
- Therapists and counselors115
- Physical therapists148
- Occupational therapists20
- Speech therapists4
- Audiologists6
- Chiropractors31
- Gynecologists32
- General surgeons15
- Physiatrists7
- Dietitians10
- Neurosurgeons10
Other care in Littleton
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).