Dr. Diana Tsai, MD
- Medicare services, 2024
- 464
- Medicare patients, 2024
- 207
- Part D claims, 2024
- 118
- Hospital affiliations
- 3
- Industry payments
- $158
- Practice address
- 815 Pollard Rd, Los Gatos, CA 95032
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Cancer Center Los Gatos - HOPD
Acute Care Hospital outpatient department · Los Gatos, California
Find Dr. 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.
Dr. Diana Tsai is a hospitalist in Los Gatos, California
Dr. Tsai practices at Cancer Center Los Gatos - HOPD in Los Gatos, California.
Dr. Tsai's NPI, 1669534467, was assigned on December 15, 2006. Dr. Tsai graduated from Saint Louis University School Of Medicine in 1999. Dr. Tsai holds California license A72927.
- NPI
- 1669534467NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8224929864
- NPI enumeration date
- December 15, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Diana Tsai practices at Cancer Center Los Gatos - HOPD in Los Gatos, California
Dr. Tsai's primary practice is Cancer Center Los Gatos - HOPD, at 815 Pollard Rd, Los Gatos, CA 95032.
- Cancer Center Los Gatos - HOPD815 Pollard Rd, Los Gatos, CA 95032
Source: Dmand AI Affiliation Data
Dr. Diana Tsai is affiliated with 5 sites of care and 1 medical group
Dr. Tsai's primary practice is Cancer Center Los Gatos - HOPD in Los Gatos, California. Dr. Tsai is also affiliated with El Camino Health - Mountain View Hospital. The medical group on file is Palo Alto Foundation Medical Group. Dmand AI also links Dr. Tsai to 2 more hospitals and 1 group practice or clinic, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Diana Tsai's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tsai practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Cancer Center Los Gatos - HOPD | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Diana Tsai is one of 3,186 hospitalists in California
Hospitalist is Dr. Tsai's primary specialty in the NPI Registry, under taxonomy code 208M00000X. Dr. Tsai is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Tsai's licenses on file in 3 states: California, Kentucky and Ohio.
Specialties and state licenses
- Hospitalist, CaliforniaPrimary
- Kentucky license
- Ohio license
Clinical focus
Dmand AI lists cardiac arrhythmia, cellulitis, circulatory problems in extremities, congestive heart failure, electrolyte disorders, gastrointestinal inflammation, headaches and heart attack among the conditions Dr. Tsai treats.
Hospitalists near Dr. 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
Dr. Diana Tsai billed Medicare for 464 services in 2024
CMS data shows 464 Medicare services from Dr. Tsai across 6 procedure codes in 2024, for 207 Medicare patients. Medicare paid $44,944 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Tsai's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4632024: 464No change
Dr. Tsai compared with the California median for hospitalists, 2024
- Dr. Tsai
- California median
- Medicare services
- 464vs 4308% above
- Medicare patients
- 207vs 201Close to median
- Part D claims
- 11vs 6984% below
Medians across 2,991 hospitalists in California with Dmand AI profiles that report each measure.
Dr. Tsai's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Tsai and other hospitalists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Diana Tsai treated 207 Medicare patients in 2024, average age 82
CMS counts 207 Medicare patients who saw Dr. Tsai in 2024. The largest group is 75 to 84, with 89 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 8% are also on Medicaid. Their average risk score is 1.75, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Tsai's median patient age at 76, with 56% women.
Dr. Tsai's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Tsai's Medicare patients by sex, 2024
- Women11455%
- Men9345%
Chronic conditions among Dr. Tsai's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis57%
- Ischemic heart disease48%
- Atrial fibrillation45%
- Chronic kidney disease43%
- Heart failure43%
- Diabetes40%
Share of Medicare patients with each condition. A patient can have several.
Dr. 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
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Diana Tsai wrote 118 Medicare Part D claims in 2024
In 2024, Dr. Tsai wrote 118 Medicare Part D claims for 66 patients. 93% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $86 in total drug cost. In 2022, CMS named 11 claims across 1 drug.
Dr. Tsai's Part D claims by kind of drug, 2024
- Generic110 claims93%
- Brand-name and other8 claims7%
Dr. 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 Dr. Tsai's Part D claims, 2024
- Opioids10%12 of 118 claims
- Antibiotics28%33 of 118 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, 2022 to 2024
- 2022
- 2024
- Claims for drugs CMS names
- 2022: 112024: 11No change
Drugs named by CMS: 1 in 2024, 1 in 2022.
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 Dr. Diana Tsai takes part in Medicare
Dr. 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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Dr. Diana Tsai received $158 in industry payments from 2017 to 2025
CMS Open Payments shows 6 general payments to Dr. Tsai from 5 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Abiomed paid the most, $94.
General payments to Dr. Tsai by program year, 2017 to 2025
Companies that paid Dr. Tsai the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Diana Tsai graduated from Saint Louis University School Of Medicine
Dr. Tsai graduated from Saint Louis University School Of Medicine in 1999.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Diana Tsai accepts plans from 3 insurance carriers
Dr. Tsai is in network with 3 carriers, including Aetna, Blue Cross Blue Shield of Michigan and CMS Medicare. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- CMS Medicare
Plan types Dr. Tsai accepts, by number of carriers
- HMO2
- Medicare2
- POS2
- PPO2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Diana 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 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) |
| 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 Dr. Diana 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 Dr. Diana Tsai's NPI number?
Dr. Diana Tsai's NPI number is 1669534467. It was assigned on December 15, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Diana Tsai?
Dr. Diana Tsai is a hospitalist in Los Gatos, California. The primary specialty in the NPI Registry is Hospitalist Physician (taxonomy code 208M00000X).
Where does Dr. Diana Tsai practice?
Dr. Tsai practices at 815 Pollard Rd, Los Gatos, CA 95032. Dr. Tsai's primary practice is Cancer Center Los Gatos - HOPD in Los Gatos, California. Dmand AI also links Dr. Tsai to 2 hospitals and 1 group practice or clinic.
What is Dr. Diana Tsai's medical license number?
Dr. Tsai holds California license A72927, one of the licenses on file in 3 states.
Which states has Dr. Diana Tsai been licensed in?
Dmand AI has state licenses on file for Dr. Tsai in California (2000 to 2026), Kentucky (2003 to 2007) and Ohio (2001 to 2005).
Which hospitals is Dr. Diana Tsai affiliated with?
Dr. Tsai is affiliated with El Camino Health - Mountain View Hospital. Dmand AI links Dr. Tsai to 2 more hospitals.
What medical group is Dr. Diana Tsai part of?
Dr. Tsai is linked to Palo Alto Foundation Medical Group.
Does Dr. Diana Tsai accept Medicare?
Yes. CMS data shows Dr. Tsai billed Medicare for 464 services in 2024, and Dr. Tsai accepts Medicare assignment.
How many Medicare patients does Dr. Diana Tsai see?
CMS counts 207 Medicare patients who saw Dr. Tsai in 2024, with an average age of 82.
Is Dr. Diana Tsai board certified?
Yes. Dr. Tsai is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Diana Tsai bill to Medicare?
In 2024, Dr. Tsai's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99233) and hospital inpatient care (99239).
Where did Dr. Diana Tsai go to medical school?
Dr. Tsai graduated from Saint Louis University School Of Medicine in 1999.
What drugs does Dr. Diana Tsai prescribe most?
In 2024 Medicare Part D data, Dr. Tsai's most prescribed drugs by claims were Cephalexin.
Has Dr. Diana Tsai received payments from drug or device companies?
CMS Open Payments shows $158 in general payments to Dr. Tsai from 5 companies from 2017 to 2025. The largest total came from Abiomed.
How long has Dr. Diana Tsai been practicing?
Dr. Tsai graduated from medical school in 1999, 27 years ago.
What insurance does Dr. Diana Tsai accept?
Dr. Tsai is in network with 3 carriers, including Aetna, Blue Cross Blue Shield of Michigan and CMS Medicare. HMO plans come from the most carriers, 2. Check the plan with the practice before a visit.
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