DR. YONG-YONG TAM M.D.
NPI 1831150853
Emergency Medicine in Alameda, CA
About Dr. Yong-yong Tam M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. YONG-YONG TAM M.D. (NPI 1831150853) is an individual emergency medicine provider in Alameda, California, licensed in California (G34363) and active in the NPI registry since March 2006. She is enrolled in Medicare PECOS and is a graduate of Harvard Medical School (1976).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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
Dr. Yong-yong Tam 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.
Medicare Billing Reassignments
2Medicare enrollment records show Yong-yong Tam reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Alameda, CA 94501
- Reassigned Medicare billing, California enrollment
- 2,323 clinicians in this Medicare group
Alameda, CA 94501
- Reassigned Medicare billing, California enrollment
- 900 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94501 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
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 Yong-yong Tam's NPI number?
The NPI number for Yong-yong Tam is 1831150853. It was assigned to this individual provider in the NPPES registry on March 29, 2006.
Where is Yong-yong Tam located?
Yong-yong Tam practices at 2070 Clinton Ave Alameda Hospital, Alameda, CA 94501. The listed phone number is (510) 482-0558.
What is Yong-yong Tam's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Yong-yong Tam enrolled in Medicare?
Yes. Yong-yong Tam 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 organizations bill Medicare for Yong-yong Tam's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Yong-yong Tam reassigns Medicare benefits to 2 organizations: Cep America - California (Alameda, CA) and Alameda Health System (Alameda, CA). Each 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 Yong-yong Tam's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Yong-yong Tam accept?
Health plans from Taro Health list Yong-yong Tam as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Yong-yong Tam was last updated on January 12, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Dr. Yong-Yong Tam, M.D. · NPI 1831150853
Emergency Medicine physician in Alameda, California. Individual provider, active in the CMS NPPES registry since March 29, 2006.
## Identity
- **NPI:** 1831150853 (Entity type: Individual)
- **Enumerated:** March 29, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** G34363 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2070 CLINTON AVE, ALAMEDA HOSPITAL, Alameda, CA 94501-4399
- **Phone:** (510) 482-0558
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1821017971, Alameda, CA); Alameda Health System (NPI 1124446158, Alameda, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1976
## Record status
- **NPPES last updated:** January 12, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1831150853) · Data from the CMS NPPES public registry.