TUAN T. LAM M.D.
NPI 1124290713
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Fountain Valley, CA
About Tuan T. Lam M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TUAN T. LAM M.D. (NPI 1124290713) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Fountain Valley, California, licensed in California (A69720) and active in the NPI registry since March 2008. He is enrolled in Medicare PECOS, is affiliated with Mymichigan Medical Center Midland, and maintains a secondary practice location in Midland.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Tuan T. Lam 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
6Medicare enrollment records show Tuan Lam reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fountain Valley, CA 92708
- Reassigned Medicare billing, California enrollment
- 948 clinicians in this Medicare group
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 12 clinicians in this Medicare group
Midland, MI 48670
- Reassigned Medicare billing, Michigan enrollment
- 536 clinicians in this Medicare group
Chesaning, MI 48616
- Reassigned Medicare billing, Michigan enrollment
- 125 clinicians in this Medicare group
Richmond, VA 23227
- Reassigned Medicare billing, Virginia enrollment
- 386 clinicians in this Medicare group
Richmond, VA 23227
- Reassigned Medicare billing, Virginia enrollment
- 581 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 7
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mymichigan Medical Center Midland
Acute Care Hospitals · Midland, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92708 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.
Reported Quality Measures
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FOUNTAIN VALLEY, CA 92708
FOUNTAIN VALLEY, CA 92708
FOUNTAIN VALLEY, CA 92708
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 Tuan Lam's NPI number?
The NPI number for Tuan Lam is 1124290713. It was assigned to this individual provider in the NPPES registry on March 24, 2008.
Where is Tuan Lam located?
Tuan Lam practices at 18035 Brookhurst St Ste 1300, Fountain Valley, CA 92708. The listed phone number is (657) 241-9440.
What is Tuan Lam's specialty?
The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.
Is Tuan Lam enrolled in Medicare?
Yes. Tuan 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 organizations bill Medicare for Tuan Lam's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Tuan Lam reassigns Medicare benefits to 6 organizations: Memorialcare Medical Foundation (Fountain Valley, CA), Orange County Thoracic And Cardiovascular Surgeons A Med Corp (Orange, CA), Mymichigan Medical Center Midland (Midland, MI), Mymichigan Medical Center Saginaw (Chesaning, MI), Bon Secours Medical Group Hampton Roads Specialty Care LLC (Richmond, VA) and 1 more organization, listed in the Medicare section above. 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 Tuan Lam's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Tuan Lam accept?
Health plans from Avera Health Plans, Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, Oscar Insurance Company and Priority Health and 1 other insurer list Tuan Lam 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.
Is Tuan Lam affiliated with any hospitals?
According to CMS data, Tuan Lam is affiliated with Mymichigan Medical Center Midland.
When was this NPI record last updated?
The NPPES record for Tuan Lam was last updated on May 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Tuan T. Lam, M.D. · NPI 1124290713
Thoracic Surgery (Cardiothoracic Vascular Surgery) physician in Fountain Valley, California. Individual provider, active in the CMS NPPES registry since March 24, 2008.
## Identity
- **NPI:** 1124290713 (Entity type: Individual)
- **Enumerated:** March 24, 2008
- **Primary specialty:** Thoracic Surgery (Cardiothoracic Vascular Surgery) · taxonomy 208G00000X
- **State license:** A69720 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 18035 BROOKHURST ST STE 1300, Fountain Valley, CA 92708-6738
- **Phone:** (657) 241-9440
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Memorialcare Medical Foundation (NPI 1205167350, Fountain Valley, CA); Orange County Thoracic And Cardiovascular Surgeons A Med Corp (NPI 1154336949, Orange, CA); Mymichigan Medical Center Midland (NPI 1205889490, Midland, MI); Mymichigan Medical Center Saginaw (NPI 1427112101, Chesaning, MI); Bon Secours Medical Group Hampton Roads Specialty Care LLC (NPI 1629637475, Richmond, VA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Johns Hopkins University School Of Medicine, class of 1997
## Record status
- **NPPES last updated:** May 8, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1124290713) · Data from the CMS NPPES public registry.