TRACEY LIU MD
NPI 1639639693
Internal Medicine - Pulmonary Disease in Pleasanton, CA
About Tracey Liu Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
TRACEY LIU MD (NPI 1639639693) is an individual pulmonary disease provider in Pleasanton, California, licensed in California (A186943) and active in the NPI registry since March 2019. She is enrolled in Medicare PECOS, maintains a secondary practice location in Stanford, and is a graduate of Icahn School Of Medicine At Mount Sinai (2019).
NPPES Registry Identity
Specialties & Licenses 4
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)
Tracey Liu Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Tracey Liu reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Pleasanton, CA 94588
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Newark, CA 94560
- Reassigned Medicare billing, California enrollment
- 435 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 94588 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 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PLEASANTON, CA 94588
PLEASANTON, CA 94588
PLEASANTON, CA 94588
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 Tracey Liu's NPI number?
The NPI number for Tracey Liu is 1639639693. It was assigned to this individual provider in the NPPES registry on March 24, 2019.
Where is Tracey Liu located?
Tracey Liu practices at 5565 W Las Positas Blvd Ste 320B, Pleasanton, CA 94588. The listed phone number is (650) 725-7061.
What is Tracey Liu's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.
Is Tracey Liu enrolled in Medicare?
Yes. Tracey Liu is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Tracey Liu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Tracey Liu reassigns Medicare benefits to 2 organizations: Stanford Health Care (Pleasanton, CA) and University Healthcare Alliance (Newark, 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 Tracey Liu'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 Tracey Liu was last updated on October 2, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 25 days 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.
# Tracey Liu, MD · NPI 1639639693
Pulmonary Disease physician in Pleasanton, California. Individual provider, active in the CMS NPPES registry since March 24, 2019.
## Identity
- **NPI:** 1639639693 (Entity type: Individual)
- **Enumerated:** March 24, 2019
- **Primary specialty:** Internal Medicine - Pulmonary Disease · taxonomy 207RP1001X
- **State license:** A186943 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 5565 W LAS POSITAS BLVD STE 320B, Pleasanton, CA 94588-4001
- **Phone:** (650) 725-7061
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1124561758, Pleasanton, CA); University Healthcare Alliance (NPI 1760531198, Newark, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Icahn School Of Medicine At Mount Sinai, class of 2019
## Record status
- **NPPES last updated:** October 2, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1639639693) · Data from the CMS NPPES public registry.