Dr. Gwendolen Y. Chang, MD

Dr. Chang practices at Novelty Surgical Center in San Leandro, California.

Dr. Chang's NPI, 1386807402, was assigned on July 9, 2008. Dr. Chang graduated from Stanford University School Of Medicine in 2007. Dr. Chang holds California license A106132.

Dr. Chang's primary practice is Novelty Surgical Center, at 13851 E 14th St, San Leandro, CA 94578 in Alameda County. The practice phone is (661) 288-5700.

Dr. Chang's primary practice is Novelty Surgical Center in San Leandro, California. Dr. Chang is also affiliated with Alta Bates Summit Medical Center. The medical group on file is Alameda Health System. Dmand AI also links Dr. Chang to 3 more hospitals, 5 dialysis centers, 2 group practices and clinics 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, 11 sites in all. Vendor and product names are available with a free account.

Internal medicine is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chang is board certified in hospice and palliative medicine by the American Board of Internal Medicine. Dr. Chang is licensed in California.

Dmand AI lists acute kidney failure, chronic anemia, chronic kidney disease, fluid and electrolyte imbalances, hypercalcemia, kidney cysts and kidney disease among the conditions Dr. Chang treats.

CMS data shows 2,392 Medicare services from Dr. Chang across 16 procedure codes in 2024, for 488 Medicare patients. Medicare paid $269,069 for them.

CMS counts 488 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 188 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 73% are also on Medicaid. Their average risk score is 4.52, 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 71, with 45% women.

In 2024, Dr. Chang wrote 2,140 Medicare Part D claims for 243 patients. 74% of them were for generic drugs. CMS names the drug for 1,917 of them, across 45 drugs with 11 or more claims each, at $695,943 in total drug cost. In 2023, CMS named 1,439 claims across 38 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 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. CMS lists Dr. Chang as offering telehealth.

Dmand AI links 3 papers to Dr. Chang, published from 2007 to 2011. Dr. Chang's most frequent co-authors are Joseph Ching-Ming Wu, MD, Tzung Z. Hsiai, MD and Peter P. Lee, MD.

CMS Open Payments shows 239 general payments to Dr. Chang from 27 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 97% of the total. Fresenius USA Marketing, Inc. paid the most, $999.

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

Dr. Chang graduated from Stanford University School Of Medicine in 2007.

Dr. Chang is in network with 16 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 10. Check the plan with the practice before a visit.