Dr. Iain Jacob Macewan, MD

Dr. Macewan practices at Proton Doctors Professional Corporation in San Diego, California.

Dr. Macewan's NPI, 1326300401, was assigned on June 13, 2012. Dr. Macewan graduated from UC San Diego School of Medicine in 2012. Dr. Macewan holds California license A129079.

Dr. Macewan's primary practice is Proton Doctors Professional Corporation, at 9710 Summers Ridge Rd, San Diego, CA 92121 in San Diego County. The practice phone is (858) 549-7400.

Dr. Macewan's primary practice is Proton Doctors Professional Corporation in San Diego, California. The medical group on file is UC San Diego Health. Dmand AI also links Dr. Macewan to 3 more group practices and clinics and 2 medical groups, each named with a free account.

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

Radiation oncology is Dr. Macewan's primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Macewan is board certified in radiation oncology by the American Board of Radiology. Dr. Macewan is licensed in California.

Dmand AI lists anal cancer radiation, bone cancer radiation, brain cancer radiation, brain tumor radiation, breast cancer radiation, cancer radiation-upper GI, colorectal cancer radiation and head & neck cancer radiation among the conditions Dr. Macewan treats.

CMS data shows 4,833 Medicare services from Dr. Macewan across 19 procedure codes in 2024, for 342 Medicare patients. Medicare paid $2,037,526 for them. Every service was in an office.

CMS counts 342 Medicare patients who saw Dr. Macewan in 2024. The largest group is 65 to 74, with 184 patients. 75% of them have cancer, and 66% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.78, 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. Macewan's median patient age at 67, with 35% women.

In 2024, Dr. Macewan wrote 72 Medicare Part D claims for 34 patients. 94% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $64 in total drug cost. In 2023, CMS named 20 claims across 1 drug.

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 91 out of 100 for Dr. Macewan for performance year 2024, reported as part of a group. Dr. Macewan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Macewan as offering telehealth.

Dmand AI links 19 papers to Dr. Macewan, published from 2013 to 2025. 2021 was the busiest year, with 4. The most frequent topics are Protons, Proton Therapy and Radiotherapy Dosage. Dr. Macewan has published most often in Int J Radiat Oncol Biol Phys. Dr. Macewan's most frequent co-authors are Ralph Philip Ermoian, MD, Daniel J. Indelicato, MD and Nadia Nicole Issa Laack, MD.

CMS Open Payments shows 12 general payments to Dr. Macewan from 10 drug and device companies from 2017 to 2024. Food and beverage make up the largest share, 100% of the total. Novartis Pharmaceuticals Corporation paid the most, $123.

Dr. Macewan graduated from UC San Diego School of Medicine in 2012. Dr. Macewan is a member of ASTRO.

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