Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Tom S. Chang M.D., Inc.

Ophthalmology Physician in Pasadena, CA · enumerated 2006 · authorized official Adam Martidis, Managing Partner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1568491827

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Tom S. Chang M.D., Inc.

Practice address 800 Fairmount Ave, Suite 312, Pasadena, CA, 91105

Phone (626) 568-8838

Fax (626) 583-8838

Enumeration date Jun 30, 2006

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Adam Martidis

Title Managing Partner

Phone (626) 568-8838

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-08-22. Verify at npiregistry.cms.hhs.gov.

Where is Tom S. Chang M.D., Inc. located?

The practice location on file with NPPES is in Pasadena, CA.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.