Tom S. Chang, MD
Retina Specialist (Ophthalmology) Physician · Pasadena, CA
Tom S. Chang, MD is a retina specialist (ophthalmology) physician with a practice address in Pasadena, California, and NPI 1609848969, issued on Feb 2, 2006. Check the license (California A69909, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tom S. Chang
- Credential
- MD
- Primary taxonomy
- Retina Specialist (Ophthalmology) Physician 207WX0107X
- License number
- A69909 CA
Self-reported in NPPES; status is on the state search - Practice location
- 100 E California Blvd, Pasadena, CA 91105
- Phone
- (626) 568-8838
- Enumerated
- Feb 2, 2006
- Record last updated
- Aug 7, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (626) 583-8838
- Medicaid IDs
- 1609848969 CA
00A699090 CA - Medicare enrollment
- Enrolled (PECOS I20060201000549); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest retina specialist (ophthalmology) physician records → All 205 in California → Look up another NPI →
Also registered at 100 E California Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nizar Abdelfattah, MDOphthalmology Physician1801359393
- Ling Bei, MDOphthalmology Physician1164740460
- Jessica Boeckmann, M.D.Ophthalmology Physician1629210679
- Alexander ChenOphthalmology Physician1528594546
- Jeffrey Jeong, O.D.Optometrist1184216848
- Renia Malek, ODOptometrist1639688179
Verify Tom S. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A69909Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% more Medicare Part D claims than the average retina specialist (ophthalmology) physician in 2024
1,080 Medicare Part D claims for 385 beneficiaries, against an average of 620 among the 1,449 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Latanoprost463 claims
- Dorzolamide-Timolol145 claims
- Prednisolone Acetate90 claims
- Timolol Maleate66 claims
- Brimonidine Tartrate52 claims
- Ofloxacin51 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $258.39
2 payments; by number, the most common kind was food and beverage; the largest payer was Bausch & Lomb Americas Inc. The 1,253 providers of this specialty with any payment received $7,667.49 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Retina Institute OF California Medical Group, A California Medical ParPasadena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tom S. Chang among 205 retina specialist (ophthalmology) physician records in California
Tom S. Chang, MD is one of 205 retina specialist (ophthalmology) physician records with a practice address in California. 98% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 65% newer
- In a Medicare fileYes · 98% of these records are
- In the CMS Doctors and Clinicians fileYes · 92% of these records are
- Graduated1988 · median 2007 among the 189 with a school on file
- Record last updated2020 · 37% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207WX0107X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Retina Specialist (Ophthalmology) Physician providers in California
There are 205 retina specialist (ophthalmology) physician records in California.
All 205 in California → Every provider in Pasadena → Retina Specialist (Ophthalmology) Physician nationwide →
The 8 retina specialist (ophthalmology) physician records with the nearest ZIP codes
- Anthony Culotta, MDPasadena, CA 911051497790018
- Jeffrey Stevens, M.D.Pasadena, CA 911051114254711
- Michael Ward, DOPasadena, CA 911051174020689
- Payam Amini, M.DPasadena, CA 911071205036456
- Giulia CorradettiPasadena, CA 911031871474825
- Gautam Vangipuram, M.DPasadena, CA 911071780052233
- Marko Popovic, MDArcadia, CA 910071720841182
- Kevin Suk, M.D.Arcadia, CA 910071326257569
Common questions
What is Tom S. Chang, MD's NPI number?
Tom S. Chang, MD's National Provider Identifier (NPI) is 1609848969, issued on Feb 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Tom S. Chang, MD located?
The NPPES record lists a practice address at 100 E California Blvd, Pasadena, CA, 91105. Phone: (626) 568-8838. Providers update this record themselves, so call before visiting.
How can I verify Tom S. Chang, MD's license?
NPPES lists California license number A69909, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Tom S. Chang, MD prescribe under Medicare Part D?
In 2024, Tom S. Chang, MD had 1,080 Medicare Part D claims for 385 beneficiaries; the average among retina specialist (ophthalmology) physician prescribers was 620. Part D covers Medicare prescriptions only.
What is Tom S. Chang, MD's MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.