MATTHEW HYUN JOON LEE D.O.
NPI 1326589581
Internal Medicine - Medical Oncology in San Mateo, CA
About Matthew Hyun Joon Lee D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MATTHEW HYUN JOON LEE D.O. (NPI 1326589581) is an individual medical oncology provider in San Mateo, California, licensed in California (20A17254) and active in the NPI registry since March 2017. He is enrolled in Medicare PECOS and is a graduate of Philadelphia College Of Osteopathic Medicine (2017).
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
Matthew Hyun Joon Lee D.o. 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 Matthew Lee reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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
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 94402 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 17
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN MATEO, CA 94402
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 Matthew Lee's NPI number?
The NPI number for Matthew Lee is 1326589581. It was assigned to this individual provider in the NPPES registry on March 20, 2017.
Where is Matthew Lee located?
Matthew Lee practices at 218 De Anza Blvd, San Mateo, CA 94402. The listed phone number is (650) 341-9131.
What is Matthew Lee's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is Matthew Lee enrolled in Medicare?
Yes. Matthew Lee 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 Matthew Lee's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Matthew Lee reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (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 Matthew Lee'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 Matthew Lee was last updated on July 22, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Matthew Hyun Joon Lee, D.O. · NPI 1326589581
Medical Oncology physician in San Mateo, California. Individual provider, active in the CMS NPPES registry since March 20, 2017.
## Identity
- **NPI:** 1326589581 (Entity type: Individual)
- **Enumerated:** March 20, 2017
- **Primary specialty:** Internal Medicine - Medical Oncology · taxonomy 207RX0202X
- **State license:** 20A17254 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 218 DE ANZA BLVD, San Mateo, CA 94402-3913
- **Phone:** (650) 341-9131
## 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): Regents Of The University Of California (NPI 1376613943, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Philadelphia College Of Osteopathic Medicine, class of 2017
## Record status
- **NPPES last updated:** July 22, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1326589581) · Data from the CMS NPPES public registry.