Jonathan Tsai

  • San Leandro, CA
  • Hospitalist
NPI1497252522PAC ID4082951447
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
Social profiles

Primary practice

San Leandro Medical Center

Hospital · San Leandro, California

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.

View contacts for free

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 and contact details
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.

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.

EHR by site
SiteEHR vendor and product
San Leandro Medical CenterAvailable with a free account

Source: Dmand AI Technology Install Data

For health IT teams

See the EHR and IT leaders at every hospital where Jonathan Tsai practices

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 YorkPrimaryLicense 311648 · 2021 to 2024 · taxonomy 208M00000X
  • California licenseLicense 180276 · 2022 to 2026

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.

Medicare services, 2023258
Medicare patients24
Paid by Medicare$22,183
Procedure codes4

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.

See all procedures by Jonathan Tsai

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.

Book a meeting

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.

Medicare patients, 202424
Average age69
Average risk score4.07

Jonathan Tsai's Medicare patients by sex, 2024

  • Women1146%
  • Men1354%

Chronic conditions among Jonathan Tsai's Medicare patients, 2024

  1. Chronic kidney disease75%
  2. Diabetes75%
  3. High blood pressure75%
  4. High cholesterol71%
  5. 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.

Part D claims, 2024349
Drugs named by CMS7
Total drug cost$1,088
Part D patients164

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.

See all prescribing by Jonathan Tsai

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)

For MedTech and pharma teams

Find hospitalists like Jonathan Tsai by procedure volume and prescribing

Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.

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.

Papers15
Years published2012 to 2018

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

Recent publications by Jonathan Tsai

See all 15 publications and co-authors

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.

How network discovery works

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.

See all payments to Jonathan Tsai

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.

  1. Medical schoolSt. George's University School of Medicine
  2. Board certified in internal medicineAmerican Board of 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

  1. EPO2
  2. Medicare2
  3. PPO2
  4. HMO1
  5. POS1

Source: Dmand AI Insurance Network Data

Sources for Jonathan Tsai's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare 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 percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand 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.

Selling to hospitalist practices?

See hospitalists in California by site of care and group

Find the practices, groups and hospitals they work with, and the right people to contact at each.

  • 30 days free
  • Self-serve
  • No credit card

Cookie settings

Turn each category on or off. Your choice is kept for 12 months and you can change it here at any time.

Necessary

Always on. Sign-in, security, downloads you asked for, your cookie choice, and the page that led to a signup.

View cookies (6)
  • dm_consentDmand AI. Your cookie choices and whether your browser sent a Global Privacy Control signal. 12 months.
  • dm_ft, dm_ltDmand AI. The first and the latest page you arrived on, with the date, so a signup is credited to the page that worked. 90 days, 30 days.
  • dm_fs, dm_lsDmand AI. The first and the latest source of a visit (a search engine, a campaign or the site that linked here). 90 days, 30 days.
  • dm_dl, dm_dl_okDmand AI. After you give an email address for a download, lets you download files without being asked again. 30 days.
  • Session and CSRF cookiesDmand AI (app.dmand.ai). Sign-in and form protection in the application. Session.
  • __cf_bm, cf_clearanceCloudflare. Tells people from automated traffic and keeps the site available. 30 minutes; cf_clearance while a security check is valid.

Analytics

On unless you turn it off. How pages are used, in aggregate, and recordings of how pages are used.

View cookies (6)
  • Google Tag ManagerGoogle. Loads the analytics and marketing tags that are on. Sets no cookie of its own and does not load when both categories are off. n/a.
  • _ga, _ga_<container-id>Google Analytics 4. Visits and page views in aggregate on dmand.ai. 2 years.
  • _clck, _clskMicrosoft Clarity. Recordings and heatmaps of how pages are used, with form fields masked. 1 year, 1 day.
  • CLID, MUID, ANONCHK, MR, SMMicrosoft (clarity.ms). Set by Microsoft when Clarity loads, to recognize a browser across sites that use Clarity. Up to 1 year.
  • None (cookieless)Ahrefs Analytics. Page views in aggregate. n/a.
  • ph_<project>_posthogPostHog. Product usage, errors and performance in app.dmand.ai, used to fix bugs and improve features. 365 days.

Marketing

On unless you turn it off, and always off when your browser sends a Global Privacy Control signal. A visitor identification service tells our sales team which companies and people visit.

View cookies (6)
  • _reb2buid, _reb2butkRB2B. Recognizes a returning browser for visitor identification. 360 days, 1 year.
  • _reb2bgeoRB2B. The location used to decide whether a visit can be identified. 20 days.
  • _reb2brefRB2B. The page or site that referred the visit. 15 days.
  • _reb2bfxf, _reb2btd, _reb2bliRB2B. Links the visit to an identified business profile. 1 month.
  • _reb2bresolveRB2B. Holds a match while it is being resolved. 2 days.
  • _reb2sessionID, _reb2bloadedRB2B. The current visit, and a guard against loading the script twice. 30 minutes, 1 second.

Functional

On unless you turn it off. Remembers choices such as a collapsed section.

View cookies (none today)