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Dr. Terrence Charles Tan, DO
NPI1851622435PAC ID1759410020
- Medicare patients, 2024
- 12
- Part D claims, 2024
- 2,082
- Publications
- 1
- Hospital affiliations
- 2
- Industry payments
- $785
- 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. Tan's professional email, personal email and mobile number
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Dr. Terrence Charles Tan is an internist in Riverside, California
Dr. Tan practices at Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
Dr. Tan's NPI, 1851622435, was assigned on January 21, 2010. Dr. Tan graduated from WesternU College of Osteopathic Medicine of the Pacific in 2008. Dr. Tan holds California license 20A11111.
NPI and contact details
- NPI
- 1851622435NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1759410020
- NPI enumeration date
- January 21, 2010
- NPI status
- Active
- Accepts Medicare assignment
- 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. Terrence Charles Tan practices at Riverside Medical Center in Riverside, California
Dr. Tan'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. Terrence Charles Tan is affiliated with 2 sites of care and 1 medical group
Dr. Tan's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente. Dr. Tan is also affiliated with Arrowhead Regional Medical Center. The medical group on file is Southern California Permanente Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Terrence Charles Tan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tan 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
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Dr. Terrence Charles Tan is one of 16,751 internists in California
Internal medicine is Dr. Tan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Tan is board certified in internal medicine by the AOA Board of Internal Medicine. Dr. Tan is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists rheumatoid arthritis among the conditions Dr. Tan treats.
Internists near Dr. Tan
Counts of internists 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. Terrence Charles Tan treated 12 Medicare patients in 2024, average age 64
CMS counts 12 Medicare patients who saw Dr. Tan in 2024. The largest group is 85 and over, with 0 patients. Their average risk score is 0.88, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tan's median patient age at 53, with 81% women.
Medicare patients, 202412
Average age64
Average risk score0.88
Dr. Tan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Tan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 53
Patient panel by sex, all payers
- Women81%
- Men18%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Terrence Charles Tan wrote 2,082 Medicare Part D claims in 2024
In 2024, Dr. Tan wrote 2,082 Medicare Part D claims for 512 patients. 76% of them were for generic drugs. CMS names the drug for 1,993 of them, across 29 drugs with 11 or more claims each, at $1,552,594 in total drug cost. In 2023, CMS named 1,946 claims across 30 drugs.
Part D claims, 20242,082
Drugs named by CMS29
Total drug cost$1.6M
Part D patients512
Dr. Tan's Part D claims by kind of drug, 2024
- Generic1,580 claims76%
- Brand-name502 claims24%
Dr. Tan'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. Tan's Part D claims, 2024
- Opioids2%37 of 2,082 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: 1,9462024: 1,9932%
Drugs named by CMS: 29 in 2024, 30 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
How Dr. Terrence Charles Tan takes part in Medicare
Dr. Tan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Terrence Charles Tan has 1 publication on record
Dmand AI links 1 paper to Dr. Tan in 2011.
Papers1
Recent publications by Dr. Tan
See who Dr. Tan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Tan works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Terrence Charles Tan received $785 in industry payments from 2018 to 2023
CMS Open Payments shows 6 general payments to Dr. Tan from 3 drug and device companies from 2018 to 2023. Travel and lodging make up the largest share, 94% of the total. Globus Medical, Inc. paid the most, $740.
General payments to Dr. Tan by program year, 2018 to 2023
General payments to Dr. Tan by kind, 2018 to 2023
$785in total
- Travel and lodging$74094%
- Food and beverage$456%
Companies that paid Dr. Tan the most, 2018 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Terrence Charles Tan graduated from WesternU College of Osteopathic Medicine of the Pacific
Dr. Tan graduated from WesternU College of Osteopathic Medicine of the Pacific in 2008. Dr. Tan is a member of ACR, ACR and AOA.
- Medical school
- Board certified in internal medicine
- Board certified in rheumatology
- Board certified in 2010 - 2027
Source: Dmand AI Professional Profile Data
Dr. Terrence Charles Tan accepts plans from 2 insurance carriers
Dr. Tan 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. Tan accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Terrence Charles Tan'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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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. Terrence Charles Tan
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. Terrence Charles Tan's NPI number?
Dr. Terrence Charles Tan's NPI number is 1851622435. It was assigned on January 21, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Terrence Charles Tan?
Dr. Terrence Charles Tan is an internist in Riverside, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Terrence Charles Tan practice?
Dr. Tan practices at 10800 Magnolia Avenue, Riverside, CA 92505. Dr. Tan's primary practice is Riverside Medical Center in Riverside, California, part of Kaiser Permanente.
What is Dr. Terrence Charles Tan's office phone number?
The practice phone on file for Dr. Tan is (951) 353-2000.
What is Dr. Terrence Charles Tan's medical license number?
Dr. Tan holds California license 20A11111.
Which hospitals is Dr. Terrence Charles Tan affiliated with?
Dr. Tan practices at Riverside Medical Center in Riverside, California. Dr. Tan is also affiliated with Arrowhead Regional Medical Center.
What medical group is Dr. Terrence Charles Tan part of?
Dr. Tan is linked to Southern California Permanente Medical Group.
Does Dr. Terrence Charles Tan accept Medicare?
Yes. CMS lists Dr. Tan as accepting Medicare assignment.
How many Medicare patients does Dr. Terrence Charles Tan see?
CMS counts 12 Medicare patients who saw Dr. Tan in 2024, with an average age of 64.
Is Dr. Terrence Charles Tan board certified?
Yes. Dr. Tan is board certified in internal medicine by the AOA Board of Internal Medicine.
Show 6 more questionsShow fewer questions
Where did Dr. Terrence Charles Tan go to medical school?
Dr. Tan graduated from WesternU College of Osteopathic Medicine of the Pacific in 2008.
What drugs does Dr. Terrence Charles Tan prescribe most?
In 2024 Medicare Part D data, Dr. Tan's most prescribed drugs by claims were Hydroxychloroquine Sulfate, Prednisone and Methotrexate.
Has Dr. Terrence Charles Tan received payments from drug or device companies?
CMS Open Payments shows $785 in general payments to Dr. Tan from 3 companies from 2018 to 2023. The largest total came from Globus Medical, Inc.
How long has Dr. Terrence Charles Tan been practicing?
Dr. Tan graduated from medical school in 2008, 18 years ago.
Does Dr. Terrence Charles Tan do research?
Dmand AI links 1 publication to Dr. Tan.
What insurance does Dr. Terrence Charles Tan accept?
Dr. Tan 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.
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