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Psychiatrists who accept Medicare in Diamond Bar, CA
CMS lists 11 clinicians in this specialty with a practice address in Diamond Bar. Accept Medicare assignment (the Medicare-approved amount as full payment): 10. Offer telehealth: 5.
Typical amounts Medicare approves in ZIP 91765 (2024 Medicare rates, the latest CMS has published): a new-patient visit $188, of which you pay about $47; 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.
Jim S. Chomchai, MD
✓ Accepts Medicare assignmentGraduated 1997 · Wayne State University School of MedicineMaleCharles N. Ezeaka, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2020MaleDrug and device company payments (2025): $1,702Rajan L. Iyer, MD
✓ Accepts Medicare assignmentGraduated 2018MaleKaren S. Kiefer, DO
✓ Accepts Medicare assignmentGraduated 1976 · Midwestern University, Chicago College of Osteopathic MedFemaleMargaret T. Lin, MD
✓ Accepts Medicare assignmentGraduated 1998 · Tufts University School of MedicineFemalePragati H. Mamtora, MD
✓ Accepts Medicare assignmentGraduated 2025FemaleJarvis B. Ngati, MD
✓ Accepts Medicare assignmentGraduated 2006 · University of California, Irvine, California College of MedicineMaleKevin M. Wethey, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2017MaleDrug and device company payments (2025): $801Bryan Yang, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2011 · Creighton University School of MedicineMaleDrug and device company payments (2025): $574Katie Q. Yang, MD
✓ Accepts Medicare assignment✓ TelehealthGraduated 2009FemaleGhada O. Al-Asadi, MD
May accept assignment✓ TelehealthGraduated 1975FemaleDrug and device company payments (2025): $1,506
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 Diamond Bar
- Primary care doctors81
- Nurse practitioners21
- Cardiologists12
- Dermatologists6
- Orthopedic surgeons7
- Gastroenterologists4
- Optometrists12
- Podiatrists3
- Pulmonologists6
- Endocrinologists4
- Rheumatologists4
- Oncologists7
- Psychologists7
- Therapists and counselors4
- Physical therapists16
- Chiropractors5
Other care in Diamond Bar
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).