Andrew O. Tam, MD
Radiation Oncology Physician · Arcadia, CA
Andrew O. Tam, MD is a radiation oncology physician with a practice address in Arcadia, California, and NPI 1548889298, issued on Apr 13, 2020. Check the license (California A186025, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrew O. Tam
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A186025 CA
Self-reported in NPPES; status is on the state search - Practice location
- 301 W Huntington Dr Ste 120, Arcadia, CA 91007
- Phone
- (626) 574-3657
- Enumerated
- Apr 13, 2020
- Record last updated
- Mar 4, 2026
- Fax
- (626) 898-8016
- Medicare enrollment
- Enrolled (PECOS I20250617002641); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Verify Andrew O. Tam in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A186025Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average radiation oncology physician in 2024
35 Medicare Part D claims for 22 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- City OF Hope Medical FoundationArcadia, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrew O. Tam among 735 radiation oncology physician records in California
Andrew O. Tam, 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 2020, is newer than 95% of them.
- NPI issued2020 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2020 · median 2005 among the 545 with a school on file
- Record last updated2026 · 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 Arcadia → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- James Chuang, MDArcadia, CA 910071720195977
- Hye Ri Han, MDArcadia, CA 910071013539063
- Arya Amini, M.D.Duarte, CA 910101487910774
- Jose Bazan, MDDuarte, CA 910101851535504
- Yi-Jen Chen, MDDuarte, CA 910101972698868
- Savita Dandapani, M.D. , PH.D.Duarte, CA 910101619141751
- Hyun Kim, MDDuarte, CA 910101467718379
- Eric Radany, MDDuarte, CA 910101346346897
Common questions
What is Andrew O. Tam, MD's NPI number?
Andrew O. Tam, MD's National Provider Identifier (NPI) is 1548889298, issued on Apr 13, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Andrew O. Tam, MD located?
The NPPES record lists a practice address at 301 W Huntington Dr Ste 120, Arcadia, CA, 91007. Phone: (626) 574-3657. Providers update this record themselves, so call before visiting.
How can I verify Andrew O. Tam, MD's license?
NPPES lists California license number A186025, 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 Andrew O. Tam, MD prescribe under Medicare Part D?
In 2024, Andrew O. Tam, MD had 35 Medicare Part D claims for 22 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.