WEN-YEE TSAI MD
NPI 1952425803
Internal Medicine - Endocrinology, Diabetes & Metabolism in Oakland, CA

Q: What is Wen-yee Tsai's NPI number?

The NPI number for Wen-yee Tsai is 1952425803. It was assigned to this individual provider in the NPPES registry on March 18, 2007.

Q: What is Wen-yee Tsai's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Q: When was this NPI record last updated?

The NPPES record for Wen-yee Tsai was last updated on December 21, 2021. 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.

Active since March 18, 2007PECOS EnrolledAccepts Medicare Assignment

350 30TH ST, SUITE 320, OAKLAND, CA 94609(510) 465-7600(510) 465-7765 Get Directions Write a Review

NPPES record last updated: December 21, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Wen-yee Tsai Md NPPES

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

WEN-YEE TSAI MD (NPI 1952425803) is an individual endocrinology, diabetes & metabolism provider in Oakland, California, licensed in California (A112303) and active in the NPI registry since March 2007. She is enrolled in Medicare PECOS and is a graduate of State University Of New York At Stony Brook, School Of Medicine (2003).

NPPES Registry Identity

NPI1952425803

Entity TypeIndividualFemale

Primary Taxonomy207RE0101X

Provider Legal NameWEN-YEE TSAICredential: MD

Location Address350 30TH ST, SUITE 320Oakland, CA 94609-3424

Mailing Address350 30th St, Suite 320Oakland, CA 94609-3424 · (510) 465-7600 · Fax (510) 465-7765

Phone(510) 465-7600

Fax(510) 465-7765

Sole ProprietorNo

Medical School CMSState University Of New York At Stony Brook, School Of MedicineGraduated 2003

Enumeration DateMarch 18, 2007

Last NPPES UpdateDecember 21, 2021

✔ NPI 1952425803 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians

Taxonomy Code207RE0101X

License✔ Licensed in CA · A112303

Definition

An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.

Also ListedInternal MedicineTaxonomy 207R00000X · License MD00048809 (WA)

350 30TH ST, Oakland, CA 94609

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Wen-yee Tsai Md 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 ID6507942539

PECOS Enrollment IDI20101103001217

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.

Medicare Billing Reassignment

Medicare enrollment records show Wen-yee Tsai reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Permanente Medical Group Inc

9.7 mi

Internal Medicine

901 NEVIN
Richmond, CA 94801

Reassigned Medicare billing, California enrollment
20,078 clinicians in this Medicare group

NPI 1235226531 (510) 307-1555

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94609 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

$153.83 typical visit price

range $69.00 – $202.35

Typical copayment $38.45 (range $17.25 – $50.58)

Most-billed visit code 99204

Established Patient

$119.48 typical visit price

range $23.44 – $166.46

Typical copayment $29.87 (range $5.86 – $41.61)

Most-billed visit code 99214

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.

DR. HUBERT K WONG M.D.

Ophthalmology

350 30TH ST, SUITE 444
OAKLAND, CA 94609

Alameda County (510) 832-8080

NICOLE MARIE KAIPUST M.D.

Hospitalist

350 30TH ST, SUITE 320
OAKLAND, CA 94609

Alameda County (510) 465-6700

RANDALL HEALTHCARE INC

Internal Medicine

350 30TH ST, #100
OAKLAND, CA 94609

Alameda County (510) 342-2239

PHILLIP LEON ROSS MD

Urology

350 30TH ST, STE 100
OAKLAND, CA 94609

Alameda County (510) 204-8290

ZULFIKARAL HABIB LALANI

Radiologic Technologist (Sonography)

350 30TH ST, SUITE 320
OAKLAND, CA 94609

Alameda County (510) 465-6700

LORI M BELTRAN D.O.

Family Medicine

350 30TH ST, SUITE 407
OAKLAND, CA 94609

Alameda County (510) 419-0230

MS. ANN MARIE DALEIDEN NP

Nurse Practitioner (Gerontology)

350 30TH ST, SUITE 407
OAKLAND, CA 94609

Alameda County (510) 419-0230

ANNA FRICK MD

Obstetrics & Gynecology (Urogynecology and Reconstructive Pelvic Surgery)

350 30TH ST, SUITE 100
OAKLAND, CA 94609

Alameda County (510) 204-1844

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 Wen-yee Tsai's NPI number?

The NPI number for Wen-yee Tsai is 1952425803. It was assigned to this individual provider in the NPPES registry on March 18, 2007.

Where is Wen-yee Tsai located?

Wen-yee Tsai practices at 350 30th St Suite 320, Oakland, CA 94609. The listed phone number is (510) 465-7600.

What is Wen-yee Tsai's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Is Wen-yee Tsai enrolled in Medicare?

Yes. Wen-yee 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.

Which organization bills Medicare for Wen-yee Tsai's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Wen-yee Tsai reassigns Medicare benefits to Permanente Medical Group Inc (Richmond, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Wen-yee Tsai's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Wen-yee Tsai was last updated on December 21, 2021. 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.