Nature
Jonathan Tsai
- Medicare services, 2023
- 258
- Medicare patients, 2024
- 24
- Part D claims, 2024
- 349
- Publications
- 15
- Hospital affiliations
- 1
- Practice address
- 2500 Merced Street, San Leandro, CA 94577
- Practice phone
- Call (510) 454-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Jonathan Tsai'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.
Jonathan Tsai is a hospitalist in San Leandro, California
Jonathan Tsai practices at San Leandro Medical Center in San Leandro, California, part of Kaiser Permanente.
Jonathan Tsai's NPI, 1497252522, was assigned on April 6, 2018. Jonathan Tsai graduated from St. George's University School of Medicine in 2018. Jonathan Tsai's New York license number on file is 311648.
- NPI
- 1497252522NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082951447
- NPI enumeration date
- April 6, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (510) 454-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Jonathan Tsai practices at San Leandro Medical Center in San Leandro, California
Jonathan Tsai's primary practice is San Leandro Medical Center, at 2500 Merced Street, San Leandro, CA 94577 in Alameda County. The practice phone is (510) 454-1000.
- San Leandro Medical Center2500 Merced Street, San Leandro, CA 94577 · Alameda CountyPhone(510) 454-1000
Source: Dmand AI Affiliation Data
Jonathan Tsai is affiliated with 1 site of care and 1 medical group
Jonathan Tsai's primary practice is San Leandro Medical Center in San Leandro, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Jonathan Tsai's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Jonathan Tsai practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| San Leandro Medical Center | 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.
Jonathan Tsai is one of 3,186 hospitalists in California
Hospitalist is Jonathan Tsai's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Jonathan Tsai is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Jonathan Tsai's licenses on file in 2 states: New York and California.
Specialties and state licenses
- Hospitalist, New YorkPrimary
- California license
Clinical focus
Dmand AI lists acute diabetes, cellulitis, circulatory problems in extremities, electrolyte disorders, gastrointestinal bleeding, gastrointestinal inflammation, lung disease: COPD, asthma or bronchitis and non-surgical back problems among the conditions Jonathan Tsai treats.
Hospitalists near Jonathan Tsai
Counts of hospitalists 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
Jonathan Tsai billed Medicare for 258 services in 2023
CMS data shows 258 Medicare services from Jonathan Tsai across 4 procedure codes in 2023, for 24 Medicare patients. Medicare paid $22,183 for them. Every service was in a facility, such as a hospital, rather than an office.
Jonathan Tsai's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 7272023: 25865%
Jonathan Tsai compared with the California median for hospitalists, 2023
- Jonathan Tsai
- California median
- Medicare services
- 258vs 43040% below
- Medicare patients
- 24vs 20188% below
- Part D claims
- 114vs 6965% above
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Jonathan Tsai's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Jonathan Tsai?
Medicare shows one payer. Book a meeting to get commercial claims data for Jonathan Tsai and other hospitalists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Jonathan Tsai treated 24 Medicare patients in 2024, average age 69
CMS counts 24 Medicare patients who saw Jonathan Tsai in 2024. 75% of them have chronic kidney disease, and 75% have diabetes. Their average risk score is 4.07, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Jonathan Tsai's median patient age at 76, with 50% women.
Jonathan Tsai's Medicare patients by sex, 2024
- Women1146%
- Men1354%
Chronic conditions among Jonathan Tsai's Medicare patients, 2024
- Chronic kidney disease75%
- Diabetes75%
- High blood pressure75%
- High cholesterol71%
- Heart failure46%
Share of Medicare patients with each condition. A patient can have several.
Jonathan Tsai's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women50%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Jonathan Tsai wrote 349 Medicare Part D claims in 2024
In 2024, Jonathan Tsai wrote 349 Medicare Part D claims for 164 patients. 87% of them were for generic drugs. CMS names the drug for 114 of them, across 7 drugs with 11 or more claims each, at $1,088 in total drug cost. In 2021, CMS named 15 claims across 1 drug.
Jonathan Tsai's Part D claims by kind of drug, 2024
- Generic302 claims87%
- Brand-name and other47 claims13%
Jonathan Tsai'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 Jonathan Tsai's Part D claims, 2024
- Opioids9%30 of 349 claims
- Antibiotics23%82 of 349 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, 2021 to 2024
- 2021
- 2024
- Claims for drugs CMS names
- 2021: 152024: 114660%
Drugs named by CMS: 7 in 2024, 1 in 2021.
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 Jonathan Tsai takes part in Medicare
Jonathan Tsai 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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Jonathan Tsai has 15 publications on record
Dmand AI links 15 papers to Jonathan Tsai, published from 2012 to 2018. 2017 was the busiest year, with 6. The most frequent topics are Flow Cytometry, Cell Lineage and Cell Line, Tumor. Jonathan Tsai has published most often in Proc Natl Acad Sci U S A. Jonathan Tsai's most frequent co-authors are Michael Thornton Longaker, MBA, MD, Michael Sung-Min Hu, MD and Nan Ring, MD.
Jonathan Tsai's papers by year, 2012 to 2018
Topics Jonathan Tsai writes about most
- Flow Cytometry
- Cell Lineage
- Cell Line, Tumor
- Cell Separation
- Immunotherapy
- Liver
- Liver Regeneration
- Mice, Inbred BALB C
Jonathan Tsai's most frequent co-authors
- Michael Thornton Longaker, MBA, MD3 shared papers
- Michael Sung-Min Hu, MD2 shared papers
- Nan Ring, MD2 shared papers
Recent publications by Jonathan Tsai
BMC Cell Biol
See who Jonathan Tsai researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Jonathan Tsai works with, so you can find a warm path to the right hospitalists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Jonathan Tsai received $162 in industry payments from 2022 to 2023
CMS Open Payments shows 5 general payments to Jonathan Tsai from 5 drug and device companies from 2022 to 2023. Food and beverage make up the largest share, 100% of the total. TissueTech, Inc. paid the most, $71.
General payments to Jonathan Tsai by program year, 2022 to 2023
Companies that paid Jonathan Tsai the most, 2022 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Jonathan Tsai graduated from St. George's University School of Medicine
Jonathan Tsai graduated from St. George's University School of Medicine in 2018.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Jonathan Tsai accepts plans from 4 insurance carriers
Jonathan Tsai is in network with 4 carriers, including Kaiser Permanente, Cigna and MVP Health Care. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Kaiser Permanente
- Cigna
- MVP Health Care
- CMS Medicare
Plan types Jonathan Tsai accepts, by number of carriers
- EPO2
- Medicare2
- PPO2
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Jonathan Tsai'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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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 Jonathan Tsai
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Jonathan Tsai's NPI number?
Jonathan Tsai's NPI number is 1497252522. It was assigned on April 6, 2018, and it is active in the NPI Registry.
What does Jonathan Tsai specialize in?
Jonathan Tsai is a hospitalist in San Leandro, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Jonathan Tsai practice?
Jonathan Tsai practices at 2500 Merced Street, San Leandro, CA 94577. Jonathan Tsai's primary practice is San Leandro Medical Center in San Leandro, California, part of Kaiser Permanente.
What is Jonathan Tsai's office phone number?
The practice phone on file for Jonathan Tsai is (510) 454-1000.
What is Jonathan Tsai's medical license number?
Jonathan Tsai's New York license number on file is 311648, one of the licenses on file in 2 states.
Which states has Jonathan Tsai been licensed in?
Dmand AI has state licenses on file for Jonathan Tsai in New York (2021 to 2024) and California (2022 to 2026).
Which hospitals is Jonathan Tsai affiliated with?
Jonathan Tsai practices at San Leandro Medical Center in San Leandro, California.
What medical group is Jonathan Tsai part of?
Jonathan Tsai is linked to The Permanente Medical Group, Inc.
Does Jonathan Tsai accept Medicare?
Yes. CMS data shows Jonathan Tsai billed Medicare for 258 services in 2023, and Jonathan Tsai accepts Medicare assignment.
How many Medicare patients does Jonathan Tsai see?
CMS counts 24 Medicare patients who saw Jonathan Tsai in 2024, with an average age of 69.
Show 9 more questionsShow fewer questions
Is Jonathan Tsai board certified?
Yes. Jonathan Tsai is board certified in internal medicine by the American Board of Internal Medicine.
What services does Jonathan Tsai bill to Medicare?
In 2023, Jonathan Tsai's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99238).
Where did Jonathan Tsai go to medical school?
Jonathan Tsai graduated from St. George's University School of Medicine in 2018.
What drugs does Jonathan Tsai prescribe most?
In 2024 Medicare Part D data, Jonathan Tsai's most prescribed drugs by claims were Doxycycline Monohydrate, Prednisone and Furosemide.
Has Jonathan Tsai received payments from drug or device companies?
CMS Open Payments shows $162 in general payments to Jonathan Tsai from 5 companies from 2022 to 2023. The largest total came from TissueTech, Inc.
How long has Jonathan Tsai been practicing?
Jonathan Tsai graduated from medical school in 2018, 8 years ago.
Does Jonathan Tsai do research?
Dmand AI links 15 publications to Jonathan Tsai, published from 2012 to 2018.
Who does Jonathan Tsai publish with?
Jonathan Tsai's most frequent co-authors are Michael Thornton Longaker, MBA, MD (3 shared papers), Michael Sung-Min Hu, MD (2 shared papers) and Nan Ring, MD (2 shared papers).
What insurance does Jonathan Tsai accept?
Jonathan Tsai is in network with 4 carriers, including Kaiser Permanente, Cigna and MVP Health Care. EPO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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