Costa Mesa, CA

Your doctor. Your neighborhood.

Amity Health Costa Mesa is a direct primary care practice serving Costa Mesa, Newport Beach, Huntington Beach, Santa Ana, Irvine, and surrounding Orange County communities.

1640 Newport Blvd, Suite 440, Costa Mesa CA 92627
(949) 791-8888
Fax: (949) 298-9094
Mon–Fri · 9am–4pm · By appointment
hello@amityhealthdpc.com
Become a MemberGet Directions →
Exam room at Amity Health Costa Mesa
Board-Certified Family Medicine
Same-Day Appointments Available
Accepting New Members
Serving Orange County Since 2022

The doctors behind your care.

Our Costa Mesa location is home to our full care team — physicians and our functional nutritionist.

Dr. Trevor J. Tsay MD — Amity Health Costa Mesa
MD · Board-Certified Family Medicine

Dr. Trevor J. Tsay

Orange County born and raised, Dr. Tsay founded Amity Health to restore what he values most — a real doctor–patient relationship built on time, trust, and continuity of care.

Preventive careMen's healthMetabolic healthFamily medicine
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Dr. Cindy T. Yang MD — Amity Health Costa Mesa
MD · Board-Certified Family Medicine

Dr. Cindy T. Yang

A UC Irvine Family Medicine residency graduate and Chief Resident, Dr. Yang takes a whole-person approach to care with deep focus on root-cause thinking and integrative medicine.

Women's healthPreventive medicineIntegrative & functional medicineChronic disease management
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Cristina Terwilliger RN — Amity Health Costa Mesa
RN · Functional Nutritionist

Cristina Terwilliger

Cristina came to functional nutrition through personal experience. At Amity Health she uses advanced testing — including GI-MAP gut microbiome analysis — to uncover root causes and build sustainable health plans.

Gut healthHormone balanceThyroid supportInflammation reductionImmune optimization
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A clinic that feels different.

We designed our Costa Mesa office to feel more like a sanctuary than a waiting room. Floor-to-ceiling windows, warm wood tones, and a space that actually makes you feel comfortable.

Everything available at Costa Mesa.

MembersIncluded with all membership plans

Primary & Urgent Care

Same-day appointments, preventive care, chronic disease management, and urgent care-level access for members.

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Direct Doctor Access

Text or call your doctor directly. No phone trees, no gatekeepers. Real answers when you need them.

Wholesale Labs & Medications

Labs at wholesale pricing. Medications at cost. Members save significantly compared to traditional pricing.

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Hormone & Longevity

HRT, testosterone management, and hormone optimization — all managed within your membership.

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Weight Management

Physician-supervised weight management tailored to your body, your goals, and your lifestyle.

Nutrition & Wellness

Work with Cristina Terwilliger RN, our functional nutritionist, for personalized nutrition and wellness plans.

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No Membership Required

These services are available to everyone — no membership needed.

EKG

$100

Fast, accurate EKG with same-day results reviewed by a board-certified physician.

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Surgical Clearance

From $175

Pre-op history & physical with basic labs included. Fast turnaround for surgical teams.

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Lab Work

$75

Standalone lab draw at wholesale pricing. No referral needed.

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What Costa Mesa members are saying.

★★★★★
I texted Dr. Tsay at 8pm about a rash and had a real answer in 20 minutes. I've never experienced anything like that from a doctor.
Sarah M.Costa Mesa Member
★★★★★
My whole family switched to Amity Health. The kids actually look forward to their appointments — the doctor sits down and really listens.
James & Linda K.Costa Mesa Family
★★★★★
The savings on labs alone cover the membership fee. And the care is unlike anything I've experienced before.
Robert T.Costa Mesa Member
★★★★★
5.0 stars on Google
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Conveniently located for all of OC.

Our Costa Mesa clinic on Newport Blvd is easily accessible from across Orange County. We proudly serve patients from Costa Mesa, Newport Beach, Huntington Beach, Fountain Valley, Santa Ana, Irvine, and surrounding communities.

Free parking availableADA accessibleSuite 440, 4th floor

Start with a doctor who knows your name.

Costa Mesa is currently accepting new members. Same-day appointments available.

Become a MemberHave questions? Contact us

Amity Health Costa Mesa

1640 Newport Blvd, Suite 440
Costa Mesa, CA 92627

(949) 791-8888
Fax: (949) 298-9094
hello@amityhealthdpc.com
Mon–Fri · 9am–4pm

By appointment — same-day appointments available