Home › Doctors › California › Oceanside › Gastroenterologists
Gastroenterologists who accept Medicare in Oceanside, CA
CMS lists 10 clinicians in this specialty with a practice address in Oceanside. Accept Medicare assignment (the Medicare-approved amount as full payment): 10. Offer telehealth: 10.
Typical amounts Medicare approves in ZIP 92056 (2024 Medicare rates, the latest CMS has published): a new-patient visit $140, of which you pay about $35; a follow-up visit $108, of which you pay about $27 — 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.
Is this your organization or practice? Feature it at the top of this page — $49 for 30 days →
Order: clinicians who accept assignment first, then by MIPS score (highest first), then by last name.
Mazer Ally, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2006 · George Washington University School of MedicineMaleDrug and device company payments (2025): $66,212Hellen Chiao, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2012 · Medical College of WisconsinFemaleDrug and device company payments (2025): $2,306Christopher E. Devereaux, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 1991 · University of Chicago, Pritzker School of MedicineMaleDrug and device company payments (2025): $2,587Douglas R. Hunt, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2006 · University of Massachusetts Medical SchoolMaleDrug and device company payments (2025): $850Gordon D. Liss, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2004 · Georgetown University School of MedicineMaleDrug and device company payments (2025): $655Megan E. Novo, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2015 · George Washington University School of MedicineFemaleDrug and device company payments (2025): $2,047Javaid A. Shad, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 1993 · University of Texas Medical Branch at GalvestonMaleDrug and device company payments (2025): $1,397Michael Shim
✓ Accepts Medicare assignment✓ TelehealthGraduated 2001MaleDrug and device company payments (2025): $2,555Franklin C. Tsai, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2004 · Un of California, Irvine, College of MedicineMaleDrug and device company payments (2025): $1,503Matthew E. Viernes, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 1995 · University of Wisconsin School of MedicineMaleDrug and device company payments (2025): $2,393
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 Oceanside
- Primary care doctors101
- Nurse practitioners63
- Cardiologists20
- Dermatologists19
- Orthopedic surgeons12
- Neurologists10
- Ophthalmologists18
- Optometrists11
- Podiatrists9
- Urologists9
- Nephrologists6
- Rheumatologists3
- ENT doctors6
- Oncologists5
- Psychiatrists13
- Psychologists24
- Therapists and counselors32
- Physical therapists78
- Occupational therapists14
- Audiologists8
- Chiropractors10
- Gynecologists14
- General surgeons8
- Vascular surgeons3
- Pain management doctors5
- Physiatrists4
Other care in Oceanside
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).