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THOMAS LIAN MD APC
NPI 1871712349
Psychiatry & Neurology - Psychiatry in San Diego, CA

Active since April 24, 2007
4077 FIFTH AVE, SAN DIEGO, CA 92103(619) 220-8114(877) 253-9831 Get Directions Write a Review

NPPES record last updated: August 16, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Thomas Lian Md Apc NPPES

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

THOMAS LIAN MD APC (NPI 1871712349) is a healthcare organization registered as a psychiatry in San Diego, California and active in the NPI registry since April 2007. The organization lists Thomas C Lian, Owner, as its authorized official.

NPPES Registry Identity

NPI1871712349
Entity TypeOrganization
Primary Taxonomy2084P0800X
Legal Business NameTHOMAS LIAN MD APC
Location Address4077 FIFTH AVESan Diego, CA 92103-2105
Mailing AddressPo Box 9268Rancho Santa Fe, CA 92067-4268 · (619) 220-8114 · Fax (801) 253-9831
Phone(619) 220-8114
Fax(877) 253-9831
Organization SubpartNo
Authorized OfficialThomas C LianOwner · (619) 220-8114
Enumeration DateApril 24, 2007
Last NPPES UpdateAugust 16, 2020
NPPES CertifiedAugust 16, 2020
✔ NPI 1871712349 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · G60506
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
4077 FIFTH AVE, San Diego, CA 92103
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Thomas Lian Md Apc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Thomas Lian MD Apc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Thomas Lian, M.D.
Psychiatry
NPI 1770594616
4077 FIFTH AVE
San Diego, CA 92103
(619) 220-8114
✔ PECOSSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Thomas Lian MD Apc's NPI number?

The NPI number for Thomas Lian MD Apc is 1871712349. It was assigned to this organization in the NPPES registry on April 24, 2007.

Where is Thomas Lian MD Apc located?

Thomas Lian MD Apc is located at 4077 Fifth Ave, San Diego, CA 92103. The listed phone number is (619) 220-8114.

What is Thomas Lian MD Apc's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Thomas Lian MD Apc enrolled in Medicare?

Yes. Thomas Lian MD Apc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Thomas Lian MD Apc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Psychiatry) reassigns their Medicare billing to Thomas Lian MD Apc. A 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 the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Thomas Lian MD Apc was last updated on August 16, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.