Dr. Ronald N. Gaster, MD

Dr. Gaster practices at UCI Health - Orange in Orange, California, part of UC Irvine.

Dr. Gaster's NPI, 1306940325, was assigned on September 11, 2006. Dr. Gaster graduated from David Geffen School of Medicine at UCLA in 1973. Dr. Gaster holds California license A026039.

Dr. Gaster's primary practice is UCI Health - Orange, at 101 City Drive South, Orange, CA 92868 in Orange County. The practice phone is (714) 456-7890.

Dr. Gaster's primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. Dmand AI also links Dr. Gaster to 4 medical groups and 1 group practice or clinic, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gaster practices, 2 sites in all. Vendor and product names are available with a free account.

Ophthalmology is Dr. Gaster's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Gaster is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Gaster's licenses on file in 2 states: California and Illinois.

Dmand AI lists cataract, cataract surgery with lens implant, conjunctivitis, dry eye, eye infection or inflammation, eyelid inflammation, glaucoma and hereditary corneal conditions among the conditions Dr. Gaster treats.

CMS data shows 1,066 Medicare services from Dr. Gaster across 7 procedure codes in 2024, for 250 Medicare patients. Medicare paid $57,605 for them. Every service was in an office.

CMS counts 250 Medicare patients who saw Dr. Gaster in 2024. The largest group is 65 to 74, with 113 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 36% are also on Medicaid. Their average risk score is 1.23, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Gaster's median patient age at 61, with 54% women.

In 2024, Dr. Gaster wrote 395 Medicare Part D claims for 93 patients. 35% of them were for generic drugs. CMS names the drug for 309 of them, across 10 drugs with 11 or more claims each, at $101,151 in total drug cost. In 2023, CMS named 308 claims across 6 drugs.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Gaster for performance year 2024, reported as part of a group. Dr. Gaster accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Dmand AI links 37 papers to Dr. Gaster, published from 2009 to 2023. 2012 was the busiest year, with 2. The most frequent topics are Visual Acuity, Cornea and Postoperative Complications. Dr. Gaster has published most often in Cornea. Dr. Gaster's most frequent co-authors are Marjan Farid, MD, Amy Pingchun Lin, MD and Winston Douglas Chamberlain, MD, PhD.

Dmand AI links Dr. Gaster to 1 clinical trial. Conditions studied include Dilatation, Pathologic and Keratoconus.

CMS Open Payments shows 114 general payments to Dr. Gaster from 32 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 45% of the total. Lumenis, Inc paid the most, $5,748.

Dmand AI lists 7 awards for Dr. Gaster.

Dr. Gaster graduated from David Geffen School of Medicine at UCLA in 1973. Dr. Gaster is a member of AAO, ACS and ASCRS.

Dr. Gaster is in network with 8 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.