Dr. Joann Cong Yin Chang, MD

Dr. Chang practices at D'Ambrosio Eye Care, Inc. in Lancaster, Massachusetts.

Dr. Chang's NPI, 1730359100, was assigned on March 2, 2008. Dr. Chang graduated from University Of Cincinnati College Of Medicine in 2004. Dr. Chang's Massachusetts license number on file is 243192.

Dr. Chang's primary practice is D'Ambrosio Eye Care, Inc., at 479 Old Union Turnpike, Lancaster, MA 01523 in Worcester County. The practice phone is (978) 537-3900.

Dr. Chang's primary practice is D'Ambrosio Eye Care, Inc. in Lancaster, Massachusetts. Dr. Chang is also affiliated with UMass Memorial Medical Center - University Campus. Dmand AI also links Dr. Chang to 1 more hospital, 1 group practice or clinic and 1 medical group, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 3 sites in all. Vendor and product names are available with a free account.

Ophthalmology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Chang is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Chang's licenses on file in 6 states: Massachusetts, California, Connecticut, New York, Utah and Illinois.

Dmand AI lists age-related macular degeneration, cataract, cataract surgery with lens implant, cold sores or genital herpes, conjunctivitis, dry eye, eye infection or inflammation and eyelid inflammation among the conditions Dr. Chang treats.

CMS data shows 3,098 Medicare services from Dr. Chang across 21 procedure codes in 2024, for 742 Medicare patients. Medicare paid $319,223 for them.

CMS counts 742 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 338 patients. 73% of them have high cholesterol, and 70% have high blood pressure. 24% are also on Medicaid. Their average risk score is 1.19, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 67, with 59% women.

In 2024, Dr. Chang wrote 2,271 Medicare Part D claims for 731 patients. 35% of them were for generic drugs. CMS names the drug for 2,123 of them, across 22 drugs with 11 or more claims each, at $953,114 in total drug cost. In 2023, CMS named 1,692 claims across 21 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Chang for performance year 2024, reported through an alternative payment model (APM). Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 407 procedures of cataract surgery by Dr. Chang, more than 93% of the clinicians it reports for that procedure.

Dmand AI links 8 papers to Dr. Chang, published from 2013 to 2014. The most frequent topics are Keratomileusis, Laser In Situ, Myopia and Surgical Flaps. Dr. Chang has published most often in J Cataract Refract Surg. Dr. Chang's most frequent co-authors are Joann Chang, MD, Ladan Espandar, MD and Vahid Feiz, MD.

CMS Open Payments shows 198 general payments to Dr. Chang from 26 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 77% of the total. Allergan Inc. paid the most, $48,300.

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

Dr. Chang graduated from University Of Cincinnati College Of Medicine in 2004. Dr. Chang is a member of AAO.

Dr. Chang is in network with 17 carriers, including Aetna, Elevance and Excellus BlueCross BlueShield. Medicare plans come from the most carriers, 11. Check the plan with the practice before a visit.