TATIANA TAM DO
NPI 1790304988
Internal Medicine in Vallejo, CA
About Tatiana Tam Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TATIANA TAM DO (NPI 1790304988) is an individual internal medicine provider in Vallejo, California, licensed in California (20A21019) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses 2
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
Tatiana Tam Do 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 Reassignment
Medicare enrollment records show Tatiana Tam reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Vallejo, CA 94589
- Reassigned Medicare billing, California enrollment
- 20,078 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 2
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 94589 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
VALLEJO, CA 94589
VALLEJO, CA 94589
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 Tatiana Tam's NPI number?
The NPI number for Tatiana Tam is 1790304988. It was assigned to this individual provider in the NPPES registry on April 8, 2020.
Where is Tatiana Tam located?
Tatiana Tam practices at 975 Sereno Dr, Vallejo, CA 94589. The listed phone number is (707) 651-1000.
What is Tatiana Tam's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Tatiana Tam enrolled in Medicare?
Yes. Tatiana 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 organization bills Medicare for Tatiana Tam's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Tatiana Tam reassigns Medicare benefits to Permanente Medical Group Inc (Vallejo, 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 Tatiana Tam'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 Tatiana Tam was last updated on August 31, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Tatiana Tam, DO · NPI 1790304988
Internal Medicine physician in Vallejo, California. Individual provider, active in the CMS NPPES registry since April 8, 2020.
## Identity
- **NPI:** 1790304988 (Entity type: Individual)
- **Enumerated:** April 8, 2020
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 20A21019 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 975 SERENO DR, Vallejo, CA 94589-2441
- **Phone:** (707) 651-1000
## 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:** Permanente Medical Group Inc (NPI 1336222397, Vallejo, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** August 31, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1790304988) · Data from the CMS NPPES public registry.