Dr. Andrew O. Tam, MD
- Part D claims, 2024
- 35
- Industry payments
- $218
- Affiliated sites
- 3
- Medical groups
- 2
- State license
- 1
- Practice address
- 209 Fair Oaks Ave, South Pasadena, CA 91030
- Practice phone
- Call (626) 256-4673
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
City of Hope - South Pasadena
South Pasadena, California
Find Dr. Tam's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Andrew O. Tam is a radiation oncologist in South Pasadena, California
Dr. Tam practices at City of Hope - South Pasadena in South Pasadena, California.
Dr. Tam's NPI, 1548889298, was assigned on April 13, 2020. Dr. Tam graduated from University of California, San Francisco School of Medicine in 2020. Dr. Tam holds California license A186025.
- NPI
- 1548889298NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5698177301
- NPI enumeration date
- April 13, 2020
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (626) 256-4673
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 32
- Medical school graduation
- 2020
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Andrew O. Tam practices at City of Hope - South Pasadena in South Pasadena, California
Dr. Tam's primary practice is City of Hope - South Pasadena, at 209 Fair Oaks Ave, South Pasadena, CA 91030 in Los Angeles County. The practice phone is (626) 256-4673.
- City of Hope - South Pasadena209 Fair Oaks Ave, South Pasadena, CA 91030 · Los Angeles CountyPhone(626) 256-4673
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Andrew O. Tam is affiliated with 4 sites of care and 2 medical groups
Dr. Tam's primary practice is City of Hope - South Pasadena in South Pasadena, California. The medical group on file is City of Hope. Dmand AI also links Dr. Tam to 2 more group practices and clinics, 1 other site and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Andrew O. Tam's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tam practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| City of Hope - South Pasadena | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Andrew O. Tam is one of 685 radiation oncologists in California
Radiation oncology is Dr. Tam's primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dr. Tam is licensed in California.
Specialties and state licenses
- Radiation oncology, CaliforniaPrimary
Radiation oncologists near Dr. Tam
Counts of radiation oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Andrew O. Tam's patients have a median age of 71
Across all payers, Dmand AI patient panel data puts Dr. Tam's median patient age at 71, with 65% women.
Dr. Tam's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women65%
- Men35%
Source: Dmand AI Patient Panel Data
Dr. Andrew O. Tam wrote 35 Medicare Part D claims in 2024
In 2024, Dr. Tam wrote 35 Medicare Part D claims for 22 patients. 86% of them were for generic drugs.
Dr. Tam's Part D claims by kind of drug, 2024
- Generic30 claims86%
- Brand-name and other5 claims14%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Andrew O. Tam offers telehealth to Medicare patients
Dr. Tam accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Tam as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Andrew O. Tam received $218 in industry payments in 2025
CMS Open Payments shows 2 general payments to Dr. Tam from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Becton, Dickinson and Company paid the most, $172.
Companies that paid Dr. Tam the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Andrew O. Tam graduated from University of California, San Francisco School of Medicine
Dr. Tam graduated from University of California, San Francisco School of Medicine in 2020.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Andrew O. Tam's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Andrew O. Tam
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What is Dr. Andrew O. Tam's NPI number?
Dr. Andrew O. Tam's NPI number is 1548889298. It was assigned on April 13, 2020, and it is active in the NPI Registry.
What kind of doctor is Dr. Andrew O. Tam?
Dr. Andrew O. Tam is a radiation oncologist in South Pasadena, California. The primary specialty in the NPI Registry is Radiation Oncology Physician (taxonomy code 2085R0001X).
Where does Dr. Andrew O. Tam practice?
Dr. Tam practices at 209 Fair Oaks Ave, South Pasadena, CA 91030. Dr. Tam's primary practice is City of Hope - South Pasadena in South Pasadena, California. Dmand AI also links Dr. Tam to 2 group practices and clinics, 1 other site and 1 medical group.
What is Dr. Andrew O. Tam's office phone number?
The practice phone on file for Dr. Tam is (626) 256-4673.
What is Dr. Andrew O. Tam's medical license number?
Dr. Tam holds California license A186025.
What medical group is Dr. Andrew O. Tam part of?
Dr. Tam is linked to City of Hope. Dmand AI links Dr. Tam to 1 more medical group.
Does Dr. Andrew O. Tam accept Medicare?
Yes. CMS lists Dr. Tam as accepting Medicare assignment.
Does Dr. Andrew O. Tam offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Tam as offering telehealth services.
Where did Dr. Andrew O. Tam go to medical school?
Dr. Tam graduated from University of California, San Francisco School of Medicine in 2020.
Has Dr. Andrew O. Tam received payments from drug or device companies?
CMS Open Payments shows $218 in general payments to Dr. Tam from 2 companies from 2025 to 2025. The largest total came from Becton, Dickinson and Company.
How long has Dr. Andrew O. Tam been practicing?
Dr. Tam graduated from medical school in 2020, 6 years ago.
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