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Urologists who accept Medicare in Fullerton, CA
CMS lists 6 clinicians in this specialty with a practice address in Fullerton. Accept Medicare assignment (the Medicare-approved amount as full payment): 6. Offer telehealth: 3.
Typical amounts Medicare approves in ZIP 92835 (2024 Medicare rates, the latest CMS has published): a new-patient visit $142, of which you pay about $36; a follow-up visit $78, of which you pay about $19 — 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.
Michael S. Gazzaniga, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 1996 · Geisel School of Medicine at DartmouthMaleDrug and device company payments (2025): $193Harjivan S. Kohli, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 2018 · Oakland Univ, William Beaumont School of MedicineMaleDrug and device company payments (2025): $1,689Eric B. Tygenhof, MD
✓ Accepts Medicare assignmentMIPS score (2024): 100/100✓ TelehealthGraduated 2009 · University of Southern California Keck School of MedicineMaleDrug and device company payments (2025): $427Alexa Y. Chai, MD
✓ Accepts Medicare assignmentMIPS score (2024): 87.7/100Graduated 2009 · Mercer University School of MedicineFemaleDrug and device company payments (2025): $1,414Michael Maidaa, MD
✓ Accepts Medicare assignmentMIPS score (2024): 87.7/100Graduated 2019 · University of Iowa, RJ & L Carver College of MedicineMaleDrug and device company payments (2025): $7,850Ali Alavi, MD
✓ Accepts Medicare assignmentGraduated 1996 · University of Virginia School of MedicineMaleDrug and device company payments (2025): $2,522
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 Fullerton
- Primary care doctors271
- Nurse practitioners102
- Cardiologists37
- Dermatologists21
- Orthopedic surgeons12
- Neurologists17
- Gastroenterologists15
- Ophthalmologists25
- Optometrists20
- Podiatrists14
- Pulmonologists15
- Nephrologists6
- Endocrinologists15
- Rheumatologists9
- ENT doctors7
- Oncologists18
- Psychiatrists8
- Psychologists17
- Therapists and counselors15
- Physical therapists30
- Occupational therapists4
- Chiropractors17
- Gynecologists37
- General surgeons9
- Pain management doctors11
- Physiatrists13
- Dietitians10
- Neurosurgeons5
Other care in Fullerton
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).