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DR. EUNICE YI-WEN TSAI M.D.
NPI 1609070051
Dermatology in Union City, CA

Active since June 12, 2007PECOS EnrolledAccepts Medicare Assignment
3553 WHIPPLE RD, UNION CITY, CA 94587(510) 454-1000(650) 723-7796 Get Directions Write a Review

NPPES record last updated: February 11, 2022. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Eunice Yi-wen Tsai M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. EUNICE YI-WEN TSAI M.D. (NPI 1609070051) is an individual dermatology provider in Union City, California, licensed in California (A76239) and active in the NPI registry since June 2007. She is enrolled in Medicare PECOS and is a graduate of Harvard Medical School (2000).

NPPES Registry Identity

NPI1609070051
Entity TypeIndividualFemale
Primary Taxonomy207N00000X
Provider Legal NameDR. EUNICE YI-WEN TSAICredential: M.D.
Location Address3553 WHIPPLE RDUnion City, CA 94587-1507
Mailing Address3555 Whipple RdUnion City, CA 94587-1507 · (510) 675-3634 · Fax (510) 675-3626
Phone(510) 454-1000
Fax(650) 723-7796
Sole ProprietorYes
Medical School CMSHarvard Medical SchoolGraduated 2000
Enumeration DateJune 12, 2007
Last NPPES UpdateFebruary 11, 2022
✔ NPI 1609070051 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians
Taxonomy Code207N00000X
License✔ Licensed in CA · A76239
Definition
A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.
3553 WHIPPLE RD, Union City, CA 94587
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Eunice Yi-wen Tsai M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2062508625
PECOS Enrollment IDI20071012000558
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94587 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$104.51 typical visit price
range $69.00 – $202.35
Typical copayment $26.12 (range $17.25 – $50.58)
Most-billed visit code 99203
Established Patient
$84.91 typical visit price
range $23.44 – $166.46
Typical copayment $21.22 (range $5.86 – $41.61)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JAYASUDHA S PALAVALLI M.D.
Internal Medicine
3553 WHIPPLE RD
UNION CITY, CA 94587
Alameda County (510) 454-1000
CATHERINE MICHELE KNOX M.D.
Ophthalmology
3553 WHIPPLE RD
UNION CITY, CA 94587
Alameda County (510) 454-1000
PATRICIA PUI YEE LEE M.D.
Obstetrics & Gynecology
3553 WHIPPLE RD
UNION CITY, CA 94587
Alameda County (510) 454-1000
TANIA CHOPRA
Pharmacist
3553 WHIPPLE RD, 3RD FLOOR, MED STATION #4
UNION CITY, CA 94587
Alameda County (510) 675-2215
TRIXY SYU D.O.
Physical Medicine & Rehabilitation (Neuromuscular Medicine)
3553 WHIPPLE RD
UNION CITY, CA 94587
Alameda County (510) 675-4807
ANJANA VINAYAK HARNOOR MD
Internal Medicine (Endocrinology, Diabetes & Metabolism)
3553 WHIPPLE RD
UNION CITY, CA 94587
Alameda County (510) 675-4013
MS. NATALYA NICOLOFF N.P.
Nurse Practitioner (Adult Health)
3553 WHIPPLE RD
UNION CITY, CA 94587
Alameda County (510) 454-1000
NEDDA SHAKIB MISHERGHI O.D.
Optometrist
3553 WHIPPLE RD
UNION CITY, CA 94587
Alameda County (510) 454-1000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Eunice Tsai's NPI number?

The NPI number for Eunice Tsai is 1609070051. It was assigned to this individual provider in the NPPES registry on June 12, 2007.

Where is Eunice Tsai located?

Eunice Tsai practices at 3553 Whipple Rd, Union City, CA 94587. The listed phone number is (510) 454-1000.

What is Eunice Tsai's specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Is Eunice Tsai enrolled in Medicare?

Yes. Eunice Tsai is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Eunice Tsai was last updated on February 11, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.