MARKUS T. LEONG MD
NPI 1427136050
Emergency Medicine in South San Francisco, CA
About Markus T. Leong Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARKUS T. LEONG MD (NPI 1427136050) is an individual emergency medicine provider in South San Francisco, California, licensed in California (A81198) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of George Washington University School Of Medicine (2000).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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
Markus T. Leong 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 Reassignments
3Medicare enrollment records show Markus Leong reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Daly City, CA 94015
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1548216260 (California)
- 2,323 clinicians in this Medicare group
San Francisco, CA 94116
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
San Francisco, CA 94109
- Reassigned Medicare billing, California enrollment
- 155 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 94080 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.
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
SOUTH SAN FRANCISCO, CA 94080
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 Markus Leong's NPI number?
The NPI number for Markus Leong is 1427136050. It was assigned to this individual provider in the NPPES registry on November 1, 2006.
Where is Markus Leong located?
Markus Leong practices at 1200 El Camino Real, South San Francisco, CA 94080. The listed phone number is (650) 742-2000.
What is Markus Leong's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Markus Leong enrolled in Medicare?
Yes. Markus Leong 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 Markus Leong's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Markus Leong reassigns Medicare benefits to 3 organizations: Cep America - California (Daly City, CA), Permanente Medical Group Inc (San Francisco, CA) and San Francisco Emergency Medical Associates (San Francisco, 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 Markus Leong'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 Markus Leong was last updated on February 14, 2022. 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.
# Markus T. Leong, MD · NPI 1427136050
Emergency Medicine physician in South San Francisco, California. Individual provider, active in the CMS NPPES registry since November 1, 2006.
## Identity
- **NPI:** 1427136050 (Entity type: Individual)
- **Enumerated:** November 1, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A81198 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1200 EL CAMINO REAL, South San Francisco, CA 94080-3208
- **Phone:** (650) 742-2000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1922053438, Daly City, CA); Permanente Medical Group Inc (NPI 1841373800, San Francisco, CA); San Francisco Emergency Medical Associates (NPI 1134110661, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** George Washington University School Of Medicine, class of 2000
## Record status
- **NPPES last updated:** February 14, 2022
- **Other identifiers:** Medicaid 00A811980 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1427136050) · Data from the CMS NPPES public registry.