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Dermatologists who accept Medicare in Fullerton, CA
CMS lists 21 clinicians in this specialty with a practice address in Fullerton. Accept Medicare assignment (the Medicare-approved amount as full payment): 21. Offer telehealth: 2.
Typical amounts Medicare approves in ZIP 92835 (2024 Medicare rates, the latest CMS has published): a new-patient visit $96, of which you pay about $24; 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.
David Sire, MD
✓ Accepts Medicare assignmentMIPS score (2024): 96.3/100Graduated 1967MaleOther offices in Fullerton: 1Drug and device company payments (2025): $1,006Marguerite J. Critelli, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.3/100Graduated 1991 · University of Colorado School of Medicine, DenverFemaleDrug and device company payments (2025): $14Jennifer Ledon, MD
✓ Accepts Medicare assignmentMIPS score (2024): 85.2/100Graduated 2014 · University of Miami, LM Miller School of MedicineFemaleDrug and device company payments (2025): $1,184Patrick R. Dahl, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100Graduated 1991 · Stanford University School of MedicineMaleKristina A. Holmkvist, MD
✓ Accepts Medicare assignmentMIPS score (2024): 75/100Graduated 1993 · University of California, San Diego School of MedicineFemaleWilliam P. Baugh, MD
✓ Accepts Medicare assignmentMIPS score (2024): 73.9/100Graduated 1992 · Loma Linda University School of MedicineMaleDrug and device company payments (2025): $586Bruce S. Park, MD
✓ Accepts Medicare assignmentMIPS score (2024): 71.7/100Graduated 1996 · Drexel University College of MedicineMaleDrug and device company payments (2025): $202Daniel S. Chang, MD
✓ Accepts Medicare assignmentGraduated 2011 · Johns Hopkins University School of MedicineMaleOther offices in Fullerton: 1Drug and device company payments (2025): $1,205Linda Golkar, MD
✓ Accepts Medicare assignmentGraduated 1993 · University of Southern California Keck School of MedicineFemaleDrug and device company payments (2025): $537Nilanthi D. Gunawardane, MD
✓ Accepts Medicare assignmentGraduated 2009 · Harvard Medical SchoolFemaleDrug and device company payments (2025): $1,587Khaled M. Hassan, MD
✓ Accepts Medicare assignmentGraduated 2008 · Duke University School of MedicineMaleOther offices in Fullerton: 1Drug and device company payments (2025): $870G. Alden Holmes, MD
✓ Accepts Medicare assignmentGraduated 2018MaleDrug and device company payments (2025): $743Austin Longberg, DO
✓ Accepts Medicare assignmentGraduated 2016 · Michigan State University College of Osteopathic MedicineMaleOther offices in Fullerton: 1Drug and device company payments (2025): $2,688Amy N. Nguyen, MD
✓ Accepts Medicare assignmentGraduated 2001 · Tufts University School of MedicineFemaleDrug and device company payments (2025): $2,201Catherine Nguyen, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2016FemaleDrug and device company payments (2025): $1,518Tuyet A. Nguyen, MD
✓ Accepts Medicare assignmentGraduated 2016 · Albert Einstein College of Medicine of Yeshiva UniversityFemaleOther offices in Fullerton: 1Drug and device company payments (2025): $1,693Tanya S. Nino, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2008 · Loma Linda University School of MedicineFemaleOther offices in Fullerton: 1Drug and device company payments (2025): $1,967Rupa S. Reddy, DO
✓ Accepts Medicare assignmentGraduated 2005FemaleDrug and device company payments (2025): $1,060Karen R. Simpson, MD
✓ Accepts Medicare assignmentGraduated 1991FemaleOther offices in Fullerton: 1Drug and device company payments (2025): $583Stacy E. Whitelock, MD
✓ Accepts Medicare assignmentGraduated 2002 · University of California, Geffen School of MedicineFemaleOther offices in Fullerton: 1Drug and device company payments (2025): $1,008Joyce T. Yuan, MD
✓ Accepts Medicare assignmentGraduated 2013 · University of California, Geffen School of MedicineFemaleDrug and device company payments (2025): $4,891
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
- Orthopedic surgeons12
- Neurologists17
- Gastroenterologists15
- Ophthalmologists25
- Optometrists20
- Podiatrists14
- Urologists6
- 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).