Siavosh Vakilian, MD
Radiation Oncology Physician · San Diego, CA
Siavosh Vakilian, MD is a radiation oncology physician with a practice address in San Diego, California, and NPI 1427456151, issued on Dec 11, 2014. Check the license (California A133482, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Siavosh Vakilian
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A133482 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3366 5TH Ave, San Diego, CA 92103
- Phone
- (619) 230-0400
- Enumerated
- Dec 11, 2014
- Record last updated
- Jun 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (858) 429-7936
- Medicare enrollment
- Enrolled (PECOS I20141218001208); accepts Medicare assignment
- 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 3366 5TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Donald Fuller, M.D.Radiation Oncology Physician1285632711
- Tahir Ijaz, M.D.Radiation Oncology Physician1225036742
- Reza Shirazi, M.D.Radiation Oncology Physician1336175272
Verify Siavosh Vakilian in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A133482Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6.4 times the Medicare Part D claims of the average radiation oncology physician in 2024
864 Medicare Part D claims for 179 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 35 claims were for opioids.
Most prescribed
- Tamsulosin Hcl394 claims
- Methylprednisolone74 claims
- Oxybutynin Chloride35 claims
- Gemtesa33 claims
- Ciprofloxacin Hcl29 claims
- Ondansetron Hcl29 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.
Industry payments in 2024: $245.12
6 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, 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
- Genesis Healthcare Partners PCSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Siavosh Vakilian among 735 radiation oncology physician records in California
Siavosh Vakilian, MD 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 2014, is newer than 79% of them.
- NPI issued2014 · 79% of these records are older, 18% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2008 · median 2005 among the 545 with a school on file
- Record last updated2021 · 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
- Donald Fuller, M.D.San Diego, CA 921031285632711
- Adam Horn, M.D.San Diego, CA 921031982979019
- Tahir Ijaz, M.D.San Diego, CA 921031225036742
- Anuradha Koka, M.D.San Diego, CA 921031538153549
- Jyoti Mayadev, M.DSan Diego, CA 921031902906902
- Arno Mundt, M.D.San Diego, CA 921031790708808
- Chika Nwachukwu, MDSan Diego, CA 921031194138263
- Parag Sanghvi, M.D., M..S.P.H.San Diego, CA 921031801005152
Common questions
What is Siavosh Vakilian, MD's NPI number?
Siavosh Vakilian, MD's National Provider Identifier (NPI) is 1427456151, issued on Dec 11, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Siavosh Vakilian, MD located?
The NPPES record lists a practice address at 3366 5TH Ave, San Diego, CA, 92103. Phone: (619) 230-0400. Providers update this record themselves, so call before visiting.
How can I verify Siavosh Vakilian, MD's license?
NPPES lists California license number A133482, 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 Siavosh Vakilian, MD prescribe under Medicare Part D?
In 2024, Siavosh Vakilian, MD had 864 Medicare Part D claims for 179 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
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.