Dr. Michael S. Tam, MD
- Part D claims, 2024
- 85
- Publications
- 6
- Hospital affiliations
- 1
- Industry payments
- $9,067
- Medical group
- 1
- Practice address
- 10800 Magnolia Avenue, Riverside, CA 92505
- Practice phone
- Call (951) 353-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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. Michael S. Tam is a general surgeon in Riverside, California
Dr. Tam practices at Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
Dr. Tam's NPI, 1720306772, was assigned on May 13, 2010. Dr. Tam graduated from Keck School of Medicine of USC in 2008. Dr. Tam holds California license A109153.
- NPI
- 1720306772NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8426278896
- NPI enumeration date
- May 13, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (951) 353-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael S. Tam practices at Riverside Medical Center in Riverside, California
Dr. Tam's primary practice is Riverside Medical Center, at 10800 Magnolia Avenue, Riverside, CA 92505 in Riverside County. The practice phone is (951) 353-2000.
- Riverside Medical Center10800 Magnolia Avenue, Riverside, CA 92505 · Riverside CountyPhone(951) 353-2000
Source: Dmand AI Affiliation Data
Dr. Michael S. Tam is affiliated with 2 sites of care and 1 medical group
Dr. Tam's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Tam to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Michael S. Tam's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tam practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Riverside Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Kaiser Permanente and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Michael S. Tam is one of 2,926 general surgeons in California
Surgery is Dr. Tam's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Tam is board certified in colon & rectal surgery by the American Board of Colon and Rectal Surgery. Dmand AI has Dr. Tam's licenses on file in 2 states: California and Michigan.
Specialties and state licenses
- Surgery, CaliforniaPrimary
- Michigan license
General surgeons near Dr. Tam
Counts of general surgeons 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. Michael S. Tam's patients have a median age of 58
Across all payers, Dmand AI patient panel data puts Dr. Tam's median patient age at 58, with 53% 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 58
Patient panel by sex, all payers
- Women53%
- Men46%
Source: Dmand AI Patient Panel Data
Dr. Michael S. Tam wrote 85 Medicare Part D claims in 2024
In 2024, Dr. Tam wrote 85 Medicare Part D claims for 33 patients. 98% of them were for generic drugs. CMS names the drug for 24 of them, across 2 drugs with 11 or more claims each, at $144 in total drug cost. In 2023, CMS named 49 claims across 3 drugs.
Dr. Tam's Part D claims by kind of drug, 2024
- Generic83 claims98%
- Brand-name and other2 claims2%
Dr. Tam's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Tam's Part D claims, 2024
- Opioids19%16 of 85 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 492024: 2451%
Drugs named by CMS: 2 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Michael S. 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)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Michael S. Tam has 6 publications on record
Dmand AI links 6 papers to Dr. Tam, published from 2010 to 2025. Dr. Tam's most frequent co-authors are Maher A. Abbas, MD, Vikram Attaluri, MD and Robert K. Cleary, MD.
Dr. Tam's papers by year, 2010 to 2025
Dr. Tam's most frequent co-authors
- Maher A. Abbas, MD2 shared papers
- Vikram Attaluri, MD2 shared papers
- Robert K. Cleary, MD1 shared paper
Recent publications by Dr. Tam
See who Dr. Tam researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Tam works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Michael S. Tam received $9,067 in industry payments from 2016 to 2025
CMS Open Payments shows 41 general payments to Dr. Tam from 7 drug and device companies from 2016 to 2025. Education make up the largest share, 55% of the total. Intuitive Surgical, Inc. paid the most, $8,123.
General payments to Dr. Tam by program year, 2016 to 2025
General payments to Dr. Tam by kind, 2016 to 2025
- Education$5,00055%
- Travel and lodging$2,53528%
- Food and beverage$1,51617%
- Gifts$160%
Companies that paid Dr. Tam the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Michael S. Tam graduated from Keck School of Medicine of USC
Dr. Tam graduated from Keck School of Medicine of USC in 2008.
- Medical school
- Board certified in colon & rectal surgery
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Michael S. Tam accepts plans from 2 insurance carriers
Dr. Tam is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Tam accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Michael S. 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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Michael S. Tam
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Michael S. Tam's NPI number?
Dr. Michael S. Tam's NPI number is 1720306772. It was assigned on May 13, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael S. Tam?
Dr. Michael S. Tam is a general surgeon in Riverside, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Michael S. Tam practice?
Dr. Tam practices at 10800 Magnolia Avenue, Riverside, CA 92505. Dr. Tam's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. Dmand AI also links Dr. Tam to 1 group practice or clinic.
What is Dr. Michael S. Tam's office phone number?
The practice phone on file for Dr. Tam is (951) 353-2000.
What is Dr. Michael S. Tam's medical license number?
Dr. Tam holds California license A109153, one of the licenses on file in 2 states.
Which states has Dr. Michael S. Tam been licensed in?
Dmand AI has state licenses on file for Dr. Tam in California (2009 to 2026) and Michigan (2013 to 2017).
Which hospitals is Dr. Michael S. Tam affiliated with?
Dr. Tam practices at Riverside Medical Center in Riverside, California.
What medical group is Dr. Michael S. Tam part of?
Dr. Tam is linked to Southern California Permanente Medical Group.
Does Dr. Michael S. Tam accept Medicare?
Yes. CMS lists Dr. Tam as accepting Medicare assignment.
Does Dr. Michael S. Tam offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Tam as offering telehealth services.
Show 8 more questionsShow fewer questions
Is Dr. Michael S. Tam board certified?
Yes. Dr. Tam is board certified in colon & rectal surgery by the American Board of Colon and Rectal Surgery.
Where did Dr. Michael S. Tam go to medical school?
Dr. Tam graduated from Keck School of Medicine of USC in 2008.
What drugs does Dr. Michael S. Tam prescribe most?
In 2024 Medicare Part D data, Dr. Tam's most prescribed drugs by claims were Meloxicam and Tramadol HCl.
Has Dr. Michael S. Tam received payments from drug or device companies?
CMS Open Payments shows $9,067 in general payments to Dr. Tam from 7 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Michael S. Tam been practicing?
Dr. Tam graduated from medical school in 2008, 18 years ago.
Does Dr. Michael S. Tam do research?
Dmand AI links 6 publications to Dr. Tam, published from 2010 to 2025.
Who does Dr. Michael S. Tam publish with?
Dr. Tam's most frequent co-authors are Maher A. Abbas, MD (2 shared papers), Vikram Attaluri, MD (2 shared papers) and Robert K. Cleary, MD (1 shared paper).
What insurance does Dr. Michael S. Tam accept?
Dr. Tam is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
Selling to surgery practices?
See general surgeons in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card