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Internal Medicine

Gary T. Lai, MD

Sees patients in Chino, CA · Ontario, CA · California

Summary

Gary T. Lai, MD (Internal Medicine) is enrolled with Medicare at 2 practice locations in Chino, CA and Ontario, CA. NPI 1245332220. Source: CMS National Downloadable File, updated 2026-10-02.

Call(909) 548‑3888 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Gary T. Lai, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

2Practice locations
Internal MedicinePrimary specialty
May acceptAccepts Medicare assignment
YesOffers telehealth
30Years since medical school (graduated 1996)
Warren Alpert Medical School Of Brown UniversityMedical school
MaleGender (as listed)

Quick answers

Where does Gary T. Lai see patients?
Medicare's clinician data lists 2 practice locations, including Chino, CA and Ontario, CA. Call before your visit to confirm the address.
What is Gary T. Lai's specialty?
Medicare lists Internal Medicine as the primary specialty, and also General Practice.
Does Gary T. Lai accept Medicare assignment?
Medicare's clinician data says Gary T. Lai may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
Does Gary T. Lai offer telehealth?
Medicare's clinician data says Gary T. Lai offers telehealth services. Ask the office which visits can be done by video or phone.
What is the phone number for Gary T. Lai?
(909) 548-3888, as listed in official Medicare / NPI Registry data.
What is Gary T. Lai's NPI number?
1245332220. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where Gary T. Lai is enrolled with Medicare (CMS data updated 2026-10-02).

Specialties

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Chino

Clinicians with the same Medicare primary specialty in Chino, CA — not a recommendation.

All internal medicine doctors in Chino →

Clinician information

CredentialMD
Medical schoolWarren Alpert Medical School Of Brown University
Graduation year1996
Gender (as listed)Male
Medicare assignmentMay accept for some services
TelehealthOffers telehealth services
NPI (National Provider Identifier)1245332220
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians