SINYUN LAM MD
NPI 1285213025
Family Medicine in Antioch, CA
About Sinyun Lam Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SINYUN LAM MD (NPI 1285213025) is an individual family medicine provider in Antioch, California, licensed in California (A200015) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
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
Sinyun Lam 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.
Medicare Billing Reassignment
Medicare enrollment records show Sinyun Lam 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94509 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.
ANTIOCH, CA 94509
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 Sinyun Lam's NPI number?
The NPI number for Sinyun Lam is 1285213025. It was assigned to this individual provider in the NPPES registry on April 7, 2021.
Where is Sinyun Lam located?
Sinyun Lam practices at 3400 Delta Fair Blvd, Antioch, CA 94509. The listed phone number is (925) 779-5000.
What is Sinyun Lam's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Sinyun Lam enrolled in Medicare?
Yes. Sinyun Lam 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 Sinyun Lam's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sinyun Lam 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 Sinyun Lam'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 Sinyun Lam was last updated on May 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months 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.
# Sinyun Lam, MD · NPI 1285213025
Family Medicine physician in Antioch, California. Individual provider, active in the CMS NPPES registry since April 7, 2021.
## Identity
- **NPI:** 1285213025 (Entity type: Individual)
- **Enumerated:** April 7, 2021
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** A200015 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3400 DELTA FAIR BLVD, Antioch, CA 94509-4004
- **Phone:** (925) 779-5000
## 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 2021
## Record status
- **NPPES last updated:** May 5, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1285213025) · Data from the CMS NPPES public registry.