Dr. Dennis T. Hsieh, MD

  • San Jose, CA
  • Emergency medicine physician
NPI1649520701PAC ID0042525214
Medicare services, 2024
103
Medicare patients, 2024
93
Part D claims, 2024
54
Publications
5
Hospital affiliations
6
Practice address
751 South Bascom Avenue, San Jose, CA 95128
Practice phone
Call (408) 885-5000
Professional email
Get professional email
Personal email
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Mobile number
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Social profiles

Primary practice

Santa Clara Valley Medical Center

Hospital · San Jose, California

See all 17 affiliations

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Dr. Dennis T. Hsieh is an emergency medicine physician in San Jose, California

Dr. Hsieh practices at Santa Clara Valley Medical Center in San Jose, California, part of County of Santa Clara, CA.

Dr. Hsieh's NPI, 1649520701, was assigned on September 17, 2012. Dr. Hsieh graduated from UCSF School of Medicine in 2012. Dr. Hsieh holds California license A129373.

NPI and contact details
Medicare PAC ID
0042525214
NPI enumeration date
September 17, 2012
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(408) 885-5000
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Male
Estimated age
40
Medical school graduation
2012

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Dennis T. Hsieh practices at Santa Clara Valley Medical Center in San Jose, California

Dr. Hsieh's primary practice is Santa Clara Valley Medical Center, at 751 South Bascom Avenue, San Jose, CA 95128 in Santa Clara County. The practice phone is (408) 885-5000.

Source: Dmand AI Affiliation Data

Dr. Dennis T. Hsieh is affiliated with 7 sites of care and 10 medical groups

Dr. Hsieh's primary practice is Santa Clara Valley Medical Center in San Jose, California, part of County of Santa Clara, CA. Dr. Hsieh is also affiliated with Harbor-UCLA Medical Center. The medical group on file is Vituity. Dmand AI also links Dr. Hsieh to 4 more hospitals, 9 medical groups and 1 community health center, each named with a free account.

See all 17 affiliations for Dr. Hsieh

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Dennis T. Hsieh's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hsieh practices, 7 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Santa Clara Valley Medical CenterAvailable with a free account
+6 more sites and 9 medical groupsAvailable with a free account

Source: Dmand AI Technology Install Data

For health IT teams

See the EHR and IT leaders at every hospital where Dr. Hsieh practices

Dmand AI maps EHR vendors, IT decision makers and buying committees across County of Santa Clara, CA and 6.2K+ hospitals, with verified contacts in the same login.

Dr. Dennis T. Hsieh is one of 7,423 emergency medicine physicians in California

Emergency medicine is Dr. Hsieh's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Hsieh is board certified in emergency medicine by the American Board of Emergency Medicine. Dr. Hsieh is licensed in California.

Specialties and state licenses

  • Emergency medicine, CaliforniaPrimaryLicense A129373 · 2014 to 2027 · taxonomy 207P00000X

Emergency medicine physicians near Dr. Hsieh

Counts of emergency medicine physicians 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. Dennis T. Hsieh billed Medicare for 103 services in 2024

CMS data shows 103 Medicare services from Dr. Hsieh across 4 procedure codes in 2024, for 93 Medicare patients. Medicare paid $12,859 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024103
Medicare patients93
Paid by Medicare$12,859
Procedure codes4

Dr. Hsieh's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 1322024: 9131%
Tests and treatments
2023: 142024: 1214%

Dr. Hsieh compared with the California median for emergency medicine physicians, 2024

  • Dr. Hsieh
  • California median
Medicare services
103vs 26561% below
Medicare patients
93vs 24362% below
Part D claims
11vs 6282% below

Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.

Dr. Hsieh'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.

See all procedures by Dr. Hsieh

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Dennis T. Hsieh treated 93 Medicare patients in 2024, average age 78

CMS counts 93 Medicare patients who saw Dr. Hsieh in 2024. The largest group is 75 to 84, with 39 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 81% are also on Medicaid. Their average risk score is 2.58, 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. Hsieh's median patient age at 54, with 50% women.

Medicare patients, 202493
Average age78
Average risk score2.58
Also on Medicaid81%

Dr. Hsieh's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Dr. Hsieh's Medicare patients by sex, 2024

  • Women4447%
  • Men4953%

Chronic conditions among Dr. Hsieh's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Diabetes51%
  4. Chronic kidney disease44%
  5. Heart failure40%
  6. Arthritis35%
  7. Ischemic heart disease31%
  8. Alzheimer's and dementia27%

Share of Medicare patients with each condition. A patient can have several.

Dr. Hsieh's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 54

Patient panel by sex, all payers

  • Women50%
  • Men49%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Dennis T. Hsieh wrote 54 Medicare Part D claims in 2024

In 2024, Dr. Hsieh wrote 54 Medicare Part D claims for 38 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 $85 in total drug cost. In 2023, CMS named 23 claims across 2 drugs.

Part D claims, 202454
Drugs named by CMS1
Total drug cost$85
Part D patients38

Dr. Hsieh's Part D claims by kind of drug, 2024

  • Generic50 claims93%
  • Brand-name and other4 claims7%

Dr. Hsieh'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. Hsieh's Part D claims, 2024

  • Antibiotics33%18 of 54 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, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 232024: 1152%

Drugs named by CMS: 1 in 2024, 2 in 2023.

See all prescribing by Dr. Hsieh

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. Dennis T. Hsieh takes part in Medicare

Dr. Hsieh 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. Dennis T. Hsieh has 5 publications on record

Dmand AI links 5 papers to Dr. Hsieh, published from 2016 to 2023. The most frequent topics are Emergency Service, Hospital and Software. Dr. Hsieh's most frequent co-authors are Erik Sorem Anderson, MD, Brock Chimileski and Wendy Coates, MD.

Papers5
Years published2016 to 2023

Dr. Hsieh's papers by year, 2016 to 2023

Topics Dr. Hsieh writes about most

  • Emergency Service, Hospital
  • Software

Dr. Hsieh's most frequent co-authors

Recent publications by Dr. Hsieh

See all 5 publications and co-authors

See who Dr. Hsieh researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hsieh works with, so you can find a warm path to the right emergency medicine physicians.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Dennis T. Hsieh received $63 in industry payments from 2019 to 2024

CMS Open Payments shows 2 general payments to Dr. Hsieh from 2 drug and device companies from 2019 to 2024. Food and beverage make up the largest share, 60% of the total. Genentech, Inc. paid the most, $38.

General payments to Dr. Hsieh by program year, 2019 to 2024

General payments to Dr. Hsieh by kind, 2019 to 2024

$63in total
  • Food and beverage$3860%
  • Speaker and faculty fees$2540%

Companies that paid Dr. Hsieh the most, 2019 to 2024

Share is of all general payments to this clinician.

See all payments to Dr. Hsieh

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Dennis T. Hsieh graduated from UCSF School of Medicine

Dr. Hsieh graduated from UCSF School of Medicine in 2012.

  1. Medical schoolUCSF School of Medicine
  2. Board certified in emergency medicineAmerican Board of Emergency Medicine

Source: Dmand AI Professional Profile Data

Dr. Dennis T. Hsieh accepts plans from 1 insurance carrier

Dr. Hsieh is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.

  • CMS Medicare

Source: Dmand AI Insurance Network Data

Sources for Dr. Dennis T. Hsieh'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 Dr. Dennis T. Hsieh

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. Dennis T. Hsieh's NPI number?

Dr. Dennis T. Hsieh's NPI number is 1649520701. It was assigned on September 17, 2012, and it is active in the NPI Registry.

What kind of doctor is Dr. Dennis T. Hsieh?

Dr. Dennis T. Hsieh is an emergency medicine physician in San Jose, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).

Where does Dr. Dennis T. Hsieh practice?

Dr. Hsieh practices at 751 South Bascom Avenue, San Jose, CA 95128. Dr. Hsieh's primary practice is Santa Clara Valley Medical Center in San Jose, California, part of County of Santa Clara, CA. Dmand AI also links Dr. Hsieh to 4 hospitals, 9 medical groups and 1 community health center.

What is Dr. Dennis T. Hsieh's office phone number?

The practice phone on file for Dr. Hsieh is (408) 885-5000.

What is Dr. Dennis T. Hsieh's medical license number?

Dr. Hsieh holds California license A129373.

Which hospitals is Dr. Dennis T. Hsieh affiliated with?

Dr. Hsieh practices at Santa Clara Valley Medical Center in San Jose, California. Dr. Hsieh is also affiliated with Harbor-UCLA Medical Center. Dmand AI links Dr. Hsieh to 4 more hospitals.

What medical group is Dr. Dennis T. Hsieh part of?

Dr. Hsieh is linked to Vituity. Dmand AI links Dr. Hsieh to 9 more medical groups.

Does Dr. Dennis T. Hsieh accept Medicare?

Yes. CMS data shows Dr. Hsieh billed Medicare for 103 services in 2024, and Dr. Hsieh accepts Medicare assignment.

How many Medicare patients does Dr. Dennis T. Hsieh see?

CMS counts 93 Medicare patients who saw Dr. Hsieh in 2024, with an average age of 78.

Is Dr. Dennis T. Hsieh board certified?

Yes. Dr. Hsieh is board certified in emergency medicine by the American Board of Emergency Medicine.

Show 8 more questionsShow fewer questions

What services does Dr. Dennis T. Hsieh bill to Medicare?

In 2024, Dr. Hsieh's most billed Medicare services were emergency department visit (99285), emergency department visit (99284) and heart test or procedure (93010).

Where did Dr. Dennis T. Hsieh go to medical school?

Dr. Hsieh graduated from UCSF School of Medicine in 2012.

What drugs does Dr. Dennis T. Hsieh prescribe most?

In 2024 Medicare Part D data, Dr. Hsieh's most prescribed drugs by claims were Cephalexin.

Has Dr. Dennis T. Hsieh received payments from drug or device companies?

CMS Open Payments shows $63 in general payments to Dr. Hsieh from 2 companies from 2019 to 2024. The largest total came from Genentech, Inc.

How long has Dr. Dennis T. Hsieh been practicing?

Dr. Hsieh graduated from medical school in 2012, 14 years ago.

Does Dr. Dennis T. Hsieh do research?

Dmand AI links 5 publications to Dr. Hsieh, published from 2016 to 2023.

Who does Dr. Dennis T. Hsieh publish with?

Dr. Hsieh's most frequent co-authors are Erik Sorem Anderson, MD (1 shared paper), Brock Chimileski (1 shared paper) and Wendy Coates, MD (1 shared paper).

What insurance does Dr. Dennis T. Hsieh accept?

Dr. Hsieh is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.

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