Iain Jacob Macewan, M.D.
Radiation Oncology Physician · San Diego, CA
Iain Jacob Macewan, M.D. is a radiation oncology physician with a practice address in San Diego, California, and NPI 1326300401, issued on Jun 13, 2012. Check the license (California A129079, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Iain Jacob Macewan
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A129079 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9730 Summers Ridge RD, San Diego, CA 92121
- Phone
- (858) 822-4048
- Enumerated
- Jun 13, 2012
- Record last updated
- Jul 25, 2022
- Medicare enrollment
- Enrolled (PECOS I20170630002056); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2012
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 9730 Summers Ridge RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Andrew Chang, M.D.Radiation Oncology Physician1255513859
- Jehee Choi, MDRadiation Oncology Physician1619260056
- Brian Chou, MDRadiation Oncology Physician1770070609
- Atmaram Pai Panandiker, MDRadiation Oncology Physician1871552950
- Carl Rossi, M.D.Radiation Oncology Physician1518983055
Verify Iain Jacob Macewan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A129079Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average radiation oncology physician in 2024
72 Medicare Part D claims for 34 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $44.39
2 payments; by number, the most common kind was food and beverage; the largest payer was Progenics Pharmaceuticals, Inc. The 3,275 providers of this specialty with any payment received $1,897.85 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Proton Doctors Professional CorporationSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Iain Jacob Macewan among 735 radiation oncology physician records in California
Iain Jacob Macewan, M.D. is one of 735 radiation oncology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 71% of them.
- NPI issued2012 · 71% of these records are older, 24% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2012 · median 2005 among the 545 with a school on file
- Record last updated2022 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California.
All 735 in California → Every provider in San Diego → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Andrew Chang, M.D.San Diego, CA 921211255513859
- Jehee Choi, MDSan Diego, CA 921211619260056
- Brian Chou, MDSan Diego, CA 921211770070609
- Atmaram Pai Panandiker, MDSan Diego, CA 921211871552950
- Bradley Prestidge, MDSan Diego, CA 921211134126220
- Carl Rossi, M.D.San Diego, CA 921211518983055
- Kenneth Shimizu, M.D.San Diego, CA 921211326032129
- Prabhakar Tripuraneni, M.D.San Diego, CA 921211558312868
Common questions
What is Iain Jacob Macewan, M.D.'s NPI number?
Iain Jacob Macewan, M.D.'s National Provider Identifier (NPI) is 1326300401, issued on Jun 13, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Iain Jacob Macewan, M.D. located?
The NPPES record lists a practice address at 9730 Summers Ridge RD, San Diego, CA, 92121. Phone: (858) 822-4048. Providers update this record themselves, so call before visiting.
How can I verify Iain Jacob Macewan, M.D.'s license?
NPPES lists California license number A129079, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Iain Jacob Macewan, M.D. prescribe under Medicare Part D?
In 2024, Iain Jacob Macewan, M.D. had 72 Medicare Part D claims for 34 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
What is Iain Jacob Macewan, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.