Arnold Tsai, M.D.
Hospitalist Physician · Los Angeles, CA
Arnold Tsai, M.D. is a hospitalist physician with a practice address in Los Angeles, California, and NPI 1043522154, issued on Jul 6, 2010. Check the license (California A116863, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Arnold Tsai
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A116863 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 San Pablo St, Los Angeles, CA 90033
- Phone
- (323) 442-5100
- Enumerated
- Jul 6, 2010
- Record last updated
- Nov 27, 2023
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 1500 San Pablo St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Hadi Abou El Hassan, MDNeurology Physician1053995720
- Taaha Adamji, MDStudent in an Organized Health Care Education/Training Program1770414377
- Nikhil AggarwalStudent in an Organized Health Care Education/Training Program1144029596
Verify Arnold Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A116863Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average hospitalist physician in 2024
417 Medicare Part D claims for 64 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Metformin Hcl31 claims
- Lisinopril29 claims
- Atorvastatin Calcium25 claims
- Jardiance22 claims
- Lacosamide21 claims
- Amlodipine Besylate19 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.
Arnold Tsai among 3,099 hospitalist physician records in California
Arnold Tsai, M.D. is one of 3,099 hospitalist physician records with a practice address in California. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 44% of them.
- NPI issued2010 · 44% of these records are older, 53% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileNo · 81% of these records are
- Record last updated2023 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Los Angeles → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Ravneet Bajwa, M.D.Los Angeles, CA 900331194099754
- Douglass Hutcheon, MDLos Angeles, CA 900331427347640
- Matthew Johnson, M.D.Los Angeles, CA 900331043598741
- Ronald Kall, MDLos Angeles, CA 900331548531965
- Mahmood Khaledy, M.D.Los Angeles, CA 900331740418441
- Shazia Khan, M.D.Los Angeles, CA 900331336389139
- Edward Lee, MD, MPHLos Angeles, CA 900331528350261
- Anna Martinez, M.D.Los Angeles, CA 900331811287030
Common questions
What is Arnold Tsai, M.D.'s NPI number?
Arnold Tsai, M.D.'s National Provider Identifier (NPI) is 1043522154, issued on Jul 6, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Arnold Tsai, M.D. located?
The NPPES record lists a practice address at 1500 San Pablo St, Los Angeles, CA, 90033. Phone: (323) 442-5100. Providers update this record themselves, so call before visiting.
How can I verify Arnold Tsai, M.D.'s license?
NPPES lists California license number A116863, 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 Arnold Tsai, M.D. prescribe under Medicare Part D?
In 2024, Arnold Tsai, M.D. had 417 Medicare Part D claims for 64 beneficiaries; the average among hospitalist physician prescribers was 521. 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.