David Y. Tsai, M.D.
Hospitalist Physician · Mountain View, CA
David Y. Tsai, M.D. is a hospitalist physician with a practice address in Mountain View, California, and NPI 1053683334, issued on Feb 2, 2012. Check the license (California A120477, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Y. Tsai
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- A120477 CA
Self-reported in NPPES; status is on the state search - Practice location
- 701 E EL Camino Real, Mountain View, CA 94040
- Phone
- (650) 934-7000
- Enumerated
- Feb 2, 2012
- Record last updated
- Feb 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20131111001002); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2009
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 701 E EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify David Y. Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A120477Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% fewer Medicare Part D claims than the average hospitalist physician in 2024
396 Medicare Part D claims for 131 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 29 claims were for opioids.
Most prescribed
- Pantoprazole Sodium31 claims
- Ciprofloxacin Hcl18 claims
- Ondansetron Odt16 claims
- Atorvastatin Calcium14 claims
- Furosemide13 claims
- Prednisone13 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: $25.64
1 payment: food and beverage; the largest payer was Acadia Pharmaceuticals Inc. The 7,324 providers of this specialty with any payment received $494.84 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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationMountain View, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David Y. Tsai among 3,099 hospitalist physician records in California
David Y. 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 2012, is newer than 51% of them.
- NPI issued2012 · 51% of these records are older, 44% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated2009 · median 2010 among the 2,505 with a school on file
- Record last updated2021 · 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).
36 hospitalist physician records list a practice address in Mountain View
They are 36 of the 2,467 NPPES records with a practice address in Mountain View, and 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Mountain View → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Benjamin Chang, MDMountain View, CA 940401639185143
- Ryan Collins, M.D.Mountain View, CA 940401760442958
- Mahsa Esfahani, MDMountain View, CA 940401447205547
- Jose Fuentes, MDMountain View, CA 940401306944947
- Gregory KatoMountain View, CA 940401104924760
- Michael LimMountain View, CA 940401205934700
- Shreyas Mallur, M.D.Mountain View, CA 940401063519312
- Yen Nguyen, MDMountain View, CA 940401669567079
Common questions
What is David Y. Tsai, M.D.'s NPI number?
David Y. Tsai, M.D.'s National Provider Identifier (NPI) is 1053683334, issued on Feb 2, 2012. An NPI identifies a provider in billing; it is not a license.
Where is David Y. Tsai, M.D. located?
The NPPES record lists a practice address at 701 E EL Camino Real, Mountain View, CA, 94040. Phone: (650) 934-7000. Providers update this record themselves, so call before visiting.
How can I verify David Y. Tsai, M.D.'s license?
NPPES lists California license number A120477, 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 David Y. Tsai, M.D. prescribe under Medicare Part D?
In 2024, David Y. Tsai, M.D. had 396 Medicare Part D claims for 131 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.