Doctors That Accept Medicare in Martinez, CA

215 Medicare-enrolled clinicians · CMS data, refreshed 2026-06-26

These are 215 clinicians enrolled in Medicare and practicing in Martinez, grouped by specialty below. Being enrolled means they can bill Original Medicare for your care. Most also accept assignment — they take Medicare's approved amount as full payment, so you only owe your deductible and 20% coinsurance. Call first to confirm they're accepting new Medicare patients.

Providers in Martinez by Specialty

Family Medicine(20)

Andrea Sandler, MD
331 C St, Martinez94553
May accept assignment
Andrea Sandler, MD
331 C St, Martinez94553
May accept assignment
Emma Richardson, MD
331 C St, Martinez94553
May accept assignment
Emma Richardson, MD
331 C St, Martinez94553
May accept assignment
Eve Cominos, MD
331 C St, Martinez94553
May accept assignment
Eve Cominos, MD
331 C St, Martinez94553
May accept assignment
Hannah Gerdes, MD
331 C St, Martinez94553
May accept assignment
Marjorie Suarez, MD
331 C St, Martinez94553
May accept assignment
Marjorie Suarez, MD
331 C St, Martinez94553
May accept assignment
Scott Karpowicz, MD
331 C St, Martinez94553
May accept assignment
Scott Karpowicz, MD
331 C St, Martinez94553
May accept assignment
Arthur Wang, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment
Babak Rashidi, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available
Glenn Vives, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available
Huy Dao, MD
Permanente Medical Group Inc
200 Muir Rd, 2nd, Martinez94553
📞 (925) 372-1438Accepts assignmentTelehealth available
Jenna Chung, DO
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available
Justin Martin, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available
Malini Shah, MD
Permanente Medical Group Inc
200 Muir Rd, 2nd, Martinez94553
📞 (925) 372-1438Accepts assignmentTelehealth available
Marina Bissada, DO
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment
Sandra Seier, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available

Internal Medicine(8)

Denis Mahar, MD
331 C St, Martinez94553
May accept assignment
Denis Mahar, MD
331 C St, Martinez94553
May accept assignment
Rahaf Baker, MD
331 C St, Martinez94553
May accept assignment
Aysha Kunju, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment
Binh Nguyen, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available
Sheila Rezaei, DO
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available
Sherry Wu, MD
Permanente Medical Group Inc
200 Muir Rd, 2nd, Martinez94553
📞 (925) 372-1438Accepts assignment
Simily Padinjath, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment

Optometry(1)

Saira Khan, OD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment

Ophthalmology(2)

Thomas McDonald, MD
1815 Arnold Dr, Martinez94553
📞 (925) 817-0496Accepts assignment
Thomas McDonald, MD
1815 Arnold Dr, Martinez94553
Accepts assignment

Podiatry(6)

Caroline Ko, DPM
Sun Healthcare And Surgery Group Inc
1815 Arnold Dr, Martinez94553
📞 (925) 979-8313Accepts assignment
Erica Benson, DPM
Sun Healthcare And Surgery Group Inc
1815 Arnold Dr, Martinez94553
📞 (925) 979-8313Accepts assignment
James Diep, DPM
Sun Healthcare And Surgery Group Inc
1815 Arnold Dr, Martinez94553
📞 (925) 979-8313Accepts assignment
Lydia Yun, DPM
Sun Healthcare And Surgery Group Inc
1815 Arnold Dr, Martinez94553
📞 (925) 979-8313Accepts assignment
Shane Hall, DPM
Sun Healthcare And Surgery Group Inc
1815 Arnold Dr, Martinez94553
📞 (925) 979-8313Accepts assignment
Xingbo Sun, DPM
Sun Healthcare And Surgery Group Inc
1815 Arnold Dr, Martinez94553
📞 (925) 979-8313Accepts assignment

Orthopedic Surgery(2)

Jaison James, MD
1815 Arnold Dr, Martinez94553
📞 (510) 962-8969Accepts assignment
Jaison James, MD
63 Fox Ct, Martinez94553
Accepts assignment

Dermatology(1)

James Click, MD
Permanente Medical Group Inc
200 Muir Rd, 2nd, Martinez94553
📞 (925) 372-1438Accepts assignment

Physical Therapist(2)

Leslie Merken, PT
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment
Susan Le
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment

Audiology(2)

Shareka Pentony, AU
331 C St, Martinez94553
May accept assignment
Shareka Pentony, AU
331 C St, Martinez94553
May accept assignment

Nurse Practitioner(20)

Barbara Griesau, NP
331 C St, Martinez94553
May accept assignment
Barbara Griesau, NP
331 C St, Martinez94553
May accept assignment
Heather Cedermaz, NP
331 C St, Martinez94553
May accept assignment
Heather Cedermaz, NP
331 C St, Martinez94553
May accept assignment
James Botts, NP
150 Muir Rd, Martinez94553
May accept assignment
Kimberly Humphrey, NP
331 C St, Martinez94553
May accept assignment
Kimberly Humphrey, NP
331 C St, Martinez94553
May accept assignment
Lesley Splivalo, NP
331 C St, Martinez94553
May accept assignment
Lesley Splivalo, NP
331 C St, Martinez94553
May accept assignment
Lora Campos, NP
331 C St, Martinez94553
May accept assignment
Lora Campos, NP
331 C St, Martinez94553
May accept assignment
Natalie Lanzarin, NP
331 C St, Martinez94553
May accept assignment
Natalie Lanzarin, NP
331 C St, Martinez94553
May accept assignment
Remington Stanley Chua, NP
1815 Arnold Dr, Martinez94553
May accept assignment
Sandra Murguia-Gregory, NP
331 C St, Martinez94553
May accept assignment
Sandra Murguia-Gregory, NP
331 C St, Martinez94553
May accept assignment
Zohra Tokhi, NP
331 C St, Martinez94553
May accept assignment
Zohra Tokhi, NP
331 C St, Martinez94553
May accept assignment
Maribel Reyes, NP
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment
Petrice Kam, NP
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment

Marriage & Family Therapist(12)

Christina Tiedeman
Po Box, Suite 8, Martinez94553
May accept assignment
Christina Tiedeman
Po Box, Suite 8, Martinez94553
May accept assignment
Connie Hart
524 Allen St, Martinez94553
May accept assignment
Connie Hart
524 Allen St, Martinez94553
May accept assignment
Diane Alcala
331 C St, Martinez94553
May accept assignment
Diane Alcala
331 C St, Martinez94553
May accept assignment
Elizabeth Miranda
215 Pebblecreek Ct, Martinez94553
May accept assignment
Lorenzo Sierra
1340 Arnold Dr, Suite 225, Martinez94553
May accept assignment
Michael Macioci
331 C St, Martinez94553
May accept assignment
Michael Macioci
331 C St, Martinez94553
May accept assignment
Rylle Jones
1340 Arnold Dr, Suite 200, Martinez94553
📞 (925) 768-9105Accepts assignmentTelehealth available
Anjahni Davi
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignment

Physician Assistant(11)

Gabriela Castro, PA
1001 Shell Ave, Martinez94553
May accept assignment
Tana Summers, PA
407 Appalachian Way, Martinez94553
Accepts assignment
Tana Summers, PA
407 Appalachian Way, Martinez94553
Accepts assignment
Birti Singh, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignmentTelehealth available
Elizabeth Morgan, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignmentTelehealth available
Jaime Linsenbigler, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignmentTelehealth available
Madison Stargell, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignmentTelehealth available
Margaret Schmidt, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignment
Maryam Eminic, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignment
Samantha Kan, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignment
Shea Gillan, PA
Carbon Health Medical Group Of California PC
1125 Arnold Dr, Martinez94553
📞 (925) 293-9163Accepts assignmentTelehealth available

Psychiatry(11)

Brian Holoyda, MD
331 C St, Martinez94553
May accept assignment
Brian Holoyda, MD
331 C St, Martinez94553
May accept assignment
Caitlin Smith, MD
331 C St, Martinez94553
May accept assignment
Christopher Demetriades, MD
331 C St, Martinez94553
May accept assignment
Philip Bowers, MD
331 C St, Martinez94553
May accept assignment
Sarah Kaufman, MD
331 C St, Martinez94553
Accepts assignment
Tarun Bhandari, MD
331 C St, Martinez94553
Accepts assignment
Tarun Bhandari, MD
331 C St, Martinez94553
Accepts assignment
Zachary Bosshardt, MD
331 C St, Martinez94553
May accept assignment
Zohaib Abbasi, MD
331 C St, Martinez94553
Accepts assignment
Zohaib Abbasi, MD
331 C St, Martinez94553
Accepts assignment

Physical Medicine & Rehabilitation(2)

Anatoliy Fortenko, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available
Eric Alexander, MD
Permanente Medical Group Inc
200 Muir Rd, Martinez94553
📞 (925) 372-1000Accepts assignmentTelehealth available

Showing the largest specialties in this city (100 of 150 listed providers). Call ahead — not every Medicare-enrolled clinician here fits on one page.

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Frequently Asked Questions

Are these doctors in Martinez accepting new Medicare patients?

We can't say for sure — CMS's enrollment data confirms a provider is enrolled in Medicare, not whether their practice is currently open to new patients. Call first to confirm they're accepting new Medicare patients before you book.

What does "accepts Medicare assignment" mean?

It means the provider takes Medicare's approved amount as full payment for a covered service, so you only owe your normal deductible and 20% coinsurance — no extra charges. A provider marked "may accept assignment" can go either way, so ask when you call.

Will these doctors work with my Medicare Advantage plan?

Not necessarily. This directory is built from Medicare enrollment data, which applies to Original Medicare. If you have a Medicare Advantage plan, your plan's own network determines who's covered — check your plan's directory first, then confirm with the office directly.

Does Original Medicare cover dental care from these providers?

Original Medicare does not cover routine dental care like cleanings, fillings, or dentures. Some Medicare Advantage plans include dental benefits. See our guide on what Medicare does and doesn't cover for dental.

Provider data from the CMS Doctors and Clinicians National Downloadable File, refreshed 2026-06-26. Directory information only, not medical or insurance advice. View all Medicare doctors in California →