Dr. Tom S. Chang, MD

Dr. Chang practices at Osato Surgical Center in Torrance, California.

Dr. Chang's NPI, 1609848969, was assigned on February 2, 2006. Dr. Chang graduated from University of Toronto Faculty of Medicine in 1988. Dr. Chang holds California license A69909.

Dr. Chang's primary practice is Osato Surgical Center, at 3440 Lomita Blvd, Torrance, CA 90505 in Los Angeles County. The practice phone is (310) 534-8200.

Dr. Chang's primary practice is Osato Surgical Center in Torrance, California. Dr. Chang is also affiliated with Huntington Hospital. Dmand AI also links Dr. Chang to 7 more medical groups and 6 group practices and clinics, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 7 sites in all. Vendor and product names are available with a free account.

Retina specialist is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207WX0107X. Dr. Chang is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Chang's licenses on file in 2 states: California and Georgia.

Dmand AI lists age-related macular degeneration, cataract, conjunctivitis, dry eye, eyelid inflammation, glaucoma, hereditary corneal conditions and hypertensive retinopathy among the conditions Dr. Chang treats.

CMS data shows 15,047 Medicare services from Dr. Chang across 22 procedure codes in 2024, for 701 Medicare patients. Medicare paid $1,935,951 for them. Every service was in an office.

CMS counts 701 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 277 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 47% are also on Medicaid. Their average risk score is 1.84, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 72, with 56% women.

In 2024, Dr. Chang wrote 1,080 Medicare Part D claims for 385 patients. 58% of them were for generic drugs. CMS names the drug for 982 of them, across 10 drugs with 11 or more claims each, at $45,841 in total drug cost. In 2023, CMS named 757 claims across 11 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 75 out of 100 for Dr. Chang for performance year 2024, reported individually. Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Cataract surgery: 1 to 10 procedures (CMS shows small counts as a range)

Dmand AI links 29 papers to Dr. Chang, published from 2010 to 2024. 2024 was the busiest year, with 2. The most frequent topics are Fluorescein Angiography, Visual Acuity and Fundus Oculi. Dr. Chang has published most often in Arch Ophthalmol. Dr. Chang's most frequent co-authors are Michael A. Samuel, MD, Carol L. Karp, MD and Sinan Albear, MD.

CMS Open Payments shows 30 general payments to Dr. Chang from 15 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 90% of the total. Janssen Research & Development, LLC paid the most, $23,492. It also lists 3 research payments totaling $214 in 2016.

Dmand AI lists 2 awards for Dr. Chang, most recently CMS Stage 1 EHR in 2013.

Dr. Chang graduated from University of Toronto Faculty of Medicine in 1988. Dr. Chang is a member of AAO.

Dr. Chang is in network with 20 carriers, including Aetna, Blue Cross Blue Shield of Michigan and HCSC. HMO plans come from the most carriers, 13. Check the plan with the practice before a visit.