MS. ESTHER JEAN HYUNG LEE M.D.
NPI 1912224635
Pediatrics in Fremont, CA
About Ms. Esther Jean Hyung Lee M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. ESTHER JEAN HYUNG LEE M.D. (NPI 1912224635) is an individual pediatrics provider in Fremont, California, licensed in California (A120551) and active in the NPI registry since April 2010. She is enrolled in Medicare PECOS and maintains a secondary practice location in San Francisco.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ms. Esther Jean Hyung Lee M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Esther Lee reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Palo Alto, CA 94301
- Reassigned Medicare billing, California enrollment
- 4,479 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 723 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 94538 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
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Esther Lee's NPI number?
The NPI number for Esther Lee is 1912224635. It was assigned to this individual provider in the NPPES registry on April 21, 2010.
Where is Esther Lee located?
Esther Lee practices at 3120 Kearney St., Fremont, CA 94538. The listed phone number is (510) 490-1222.
What is Esther Lee's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Esther Lee enrolled in Medicare?
Yes. Esther Lee is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Esther Lee's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Esther Lee reassigns Medicare benefits to 4 organizations: Sutter Bay Medical Foundation (Palo Alto, CA), University Anesthesia Medical Group (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 Esther 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 Esther Lee was last updated on January 29, 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.
# Ms. Esther Jean Hyung Lee, M.D. · NPI 1912224635
Pediatrics physician in Fremont, California. Individual provider, active in the CMS NPPES registry since April 21, 2010.
## Identity
- **NPI:** 1912224635 (Entity type: Individual)
- **Enumerated:** April 21, 2010
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** A120551 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3120 KEARNEY ST., Fremont, CA 94538
- **Phone:** (510) 490-1222
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Sutter Bay Medical Foundation (NPI 1013950807, Palo Alto, CA); University Anesthesia Medical Group (NPI 1528137296, 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
## Record status
- **NPPES last updated:** January 29, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1912224635) · Data from the CMS NPPES public registry.