Mark Chung-Hsun Tsai, M.D.
Internal Medicine Physician · Paramount, CA
Mark Chung-Hsun Tsai, M.D. is an internal medicine physician with a practice address in Paramount, California, and NPI 1225033111, issued on Jun 16, 2005. Check the license (California A81875, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Chung-Hsun Tsai
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A81875 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16415 Colorado Ave, Paramount, CA 90723
- Phone
- (562) 634-6341
- Enumerated
- Jun 16, 2005
- Record last updated
- Apr 3, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (562) 634-8949
- Medicare enrollment
- Enrolled (PECOS I20050714000918); accepts Medicare assignment
- Medical or professional school
- University Of Pittsburgh School Of Medicine, 2001
- Entity
- Type 1 · individual
Also registered at 16415 Colorado Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jayceelyn DelacruzNurse Practitioner1629102173
- Mohammad Ismail, MDNephrology Physician1730105784
- Jose Kua, M.D.Obstetrics & Gynecology Physician1861495855
Verify Mark Chung-Hsun Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A81875Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.0 times the Medicare Part D claims of the average internal medicine physician in 2024
9,516 Medicare Part D claims for 472 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 341 claims were for opioids.
Most prescribed
- Atorvastatin Calcium445 claims
- Metformin Hcl436 claims
- Amlodipine Besylate397 claims
- Losartan Potassium266 claims
- Albuterol Sulfate Hfa248 claims
- Omeprazole239 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: $1,841.93
64 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
7 internal medicine physician records list a practice address in Paramount
They are 7 of the 286 NPPES records with a practice address in Paramount, and 17,696 internal medicine physician records in California.
All 7 in Paramount → All 17,696 in California → Every provider in Paramount →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Mark Chung-Hsun Tsai, M.D.'s NPI number?
Mark Chung-Hsun Tsai, M.D.'s National Provider Identifier (NPI) is 1225033111, issued on Jun 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Chung-Hsun Tsai, M.D. located?
The NPPES record lists a practice address at 16415 Colorado Ave, Paramount, CA, 90723. Phone: (562) 634-6341. Providers update this record themselves, so call before visiting.
How can I verify Mark Chung-Hsun Tsai, M.D.'s license?
NPPES lists California license number A81875, 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 Mark Chung-Hsun Tsai, M.D. prescribe under Medicare Part D?
In 2024, Mark Chung-Hsun Tsai, M.D. had 9,516 Medicare Part D claims for 472 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.