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Gastroenterologists who accept Medicare in Riverside, CA
CMS lists 19 clinicians in this specialty with a practice address in Riverside. Accept Medicare assignment (the Medicare-approved amount as full payment): 19. Offer telehealth: 2.
Typical amounts Medicare approves in ZIP 92505 (2024 Medicare rates, the latest CMS has published): a new-patient visit $136, of which you pay about $34; a follow-up visit $105, 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.
Yehia Naga, MD
✓ Accepts Medicare assignmentMIPS score (2024): 93.3/100Graduated 2004MaleRodrigo Duarte Chavez, MD
✓ Accepts Medicare assignmentMIPS score (2024): 0/100Graduated 2009MaleDrug and device company payments (2025): $1,011Ghanim Almohammad Aljomah, MD
✓ Accepts Medicare assignmentGraduated 2006MaleCharles T. Chaya, MD
✓ Accepts Medicare assignmentGraduated 1998 · Loma Linda University School of MedicineMaleDrug and device company payments (2025): $23Eric H. Choi, MD
✓ Accepts Medicare assignmentGraduated 2004 · Temple University School of MedicineMaleDrug and device company payments (2025): $248Benjamin Chung, MD
✓ Accepts Medicare assignmentGraduated 1985 · Hahnemann University College of MedicineMaleDrug and device company payments (2025): $82Tarek I. Hassanein, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 1976MaleDrug and device company payments (2025): $48,957James S. Ma, MD
✓ Accepts Medicare assignmentGraduated 1990 · Virginia Commonwealth University, School of MedicineMaleDrug and device company payments (2025): $53Nghia H. Nguyen, MD
✓ Accepts Medicare assignmentGraduated 2015 · University of California, San Diego School of MedicineMaleDrug and device company payments (2025): $58Zin Nwe, MD
✓ Accepts Medicare assignmentGraduated 2005FemaleDrug and device company payments (2025): $155Jean Bernadette U. Ong Kian Koc, MD
✓ Accepts Medicare assignmentGraduated 2006FemaleRonald Ortizo, MD
✓ Accepts Medicare assignmentGraduated 2015 · George Washington University School of MedicineMaleOther offices in Riverside: 1Drug and device company payments (2025): $57Sharmila R. Patel, MD
✓ Accepts Medicare assignmentGraduated 1989FemaleOther offices in Riverside: 1Drug and device company payments (2025): $27Thu N. Pham, MD
✓ Accepts Medicare assignmentGraduated 2012 · University of Wisconsin School of MedicineMaleOther offices in Riverside: 1Drug and device company payments (2025): $274John W. Pyne, MD
✓ Accepts Medicare assignmentGraduated 1990 · Medical College of PennsylvaniaMalePejman Solaimani, MD
✓ Accepts Medicare assignmentGraduated 2012MaleDrug and device company payments (2025): $694Eric Szu, MD
✓ Accepts Medicare assignmentGraduated 2014MaleDrug and device company payments (2025): $406Ravi Thiruvengadam, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 1979MaleEdward Yang, MD
✓ Accepts Medicare assignmentGraduated 2015 · Eastern Virginia Medical SchoolMaleDrug and device company payments (2025): $2,293
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 Riverside
- Primary care doctors609
- Geriatricians4
- Nurse practitioners258
- Cardiologists37
- Dermatologists24
- Orthopedic surgeons58
- Neurologists43
- Ophthalmologists48
- Optometrists59
- Podiatrists41
- Urologists22
- Pulmonologists15
- Nephrologists25
- Endocrinologists9
- Rheumatologists15
- ENT doctors36
- Oncologists24
- Psychiatrists74
- Psychologists29
- Therapists and counselors182
- Physical therapists105
- Occupational therapists19
- Speech therapists22
- Audiologists5
- Chiropractors12
- Gynecologists74
- General surgeons47
- Vascular surgeons8
- Pain management doctors11
- Physiatrists24
- Allergists7
- Dietitians3
- Neurosurgeons7
- Infectious disease doctors7
Other care in Riverside
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).