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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. TRACEY LIU MD
NPI 1639639693
Internal Medicine - Pulmonary Disease in Pleasanton, CA

Active since March 24, 2019
5565 W LAS POSITAS BLVD STE 3208, PLEASANTON, CA 94588(650) 725-7061 Get Directions Write a Review

NPPES record last updated: July 11, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Jul 11, 2026, Mar 24, 2019 (2 updates tracked since 2019).

About Dr. Tracey Liu Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. TRACEY LIU MD (NPI 1639639693) is an individual pulmonary disease provider in Pleasanton, California, licensed in California (186943) and active in the NPI registry since March 2019.

NPPES Registry Identity

NPI1639639693
Entity TypeIndividualFemale
Primary Taxonomy207RP1001X
Provider Legal NameDR. TRACEY LIUCredential: MD
Location Address5565 W LAS POSITAS BLVD STE 3208Pleasanton, CA 94588-4001
Mailing Address5565 W Las Positas Blvd Ste 3208Pleasanton, CA 94588-4001 · (650) 725-7061
Phone(650) 725-7061
Sole ProprietorNo
Enumeration DateMarch 24, 2019
Last NPPES UpdateJuly 11, 20262 updates tracked since enumeration
NPPES CertifiedJuly 11, 2026
✔ NPI 1639639693 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Pulmonary DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RP1001X
License✔ Licensed in CA · 186943
Definition
An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.
Also ListedInternal Medicine · Critical Care MedicineTaxonomy 207RC0200X · License 186943 (CA)
Also ListedInternal Medicine · Hospice and Palliative MedicineTaxonomy 207RH0002X · License 186943 (CA)
5565 W LAS POSITAS BLVD STE 3208, Pleasanton, CA 94588
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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 3208, 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.

When was this NPI record last updated?

The NPPES record for Tracey Liu was last updated on July 11, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 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.