Clin Pract Cases Emerg Med
Dr. Mark Thanassi, MD
NPI1104903038
- Medicare services, 2024
- 14
- Medicare patients, 2024
- 25
- Part D claims, 2024
- 212
- Publications
- 3
- Hospital affiliations
- 1
- Practice address
- 700 Lawrence Expressway, Santa Clara, CA 95051
- Practice phone
- Call (408) 236-6400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Thanassi'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. Mark Thanassi is an emergency medicine physician in Santa Clara, California
Dr. Thanassi practices at Santa Clara Medical Center in Santa Clara, California, part of Kaiser Permanente.
Dr. Thanassi's NPI, 1104903038, was assigned on October 31, 2006. Dr. Thanassi graduated from The Robert Larner, M.D. College of Medicine in 1993. Dr. Thanassi holds California license G86578.
NPI and contact details
- NPI
- 1104903038NPI Registry (opens in a new tab)
- NPI enumeration date
- October 31, 2006
- NPI status
- Active
- Practice phone
- (408) 236-6400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Mark Thanassi practices at Santa Clara Medical Center in Santa Clara, California
Dr. Thanassi's primary practice is Santa Clara Medical Center, at 700 Lawrence Expressway, Santa Clara, CA 95051 in Santa Clara County. The practice phone is (408) 236-6400.
- Santa Clara Medical Center700 Lawrence Expressway, Santa Clara, CA 95051 · Santa Clara CountyPhone(408) 236-6400
Source: Dmand AI Affiliation Data
Dr. Mark Thanassi is affiliated with 2 sites of care and 1 medical group
Dr. Thanassi's primary practice is Santa Clara Medical Center in Santa Clara, California, part of Kaiser Permanente. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Thanassi to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Thanassi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Thanassi practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Santa Clara Medical Center | Available with a free account |
| +1 more affiliated site | Available 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. Thanassi 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.
Dr. Mark Thanassi is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Thanassi's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Thanassi is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Thanassi's licenses on file in 2 states: California and Connecticut.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Connecticut license
Emergency medicine physicians near Dr. Thanassi
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
7,423emergency medicine physicians in California72emergency medicine physicians in Santa Clara57emergency medicine physicians at Santa Clara Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark Thanassi billed Medicare for 14 services in 2024
CMS data shows 14 Medicare services from Dr. Thanassi across 1 procedure code in 2024, for 25 Medicare patients. Medicare paid $1,317 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202414
Medicare patients25
Paid by Medicare$1,317
Procedure codes1
Dr. Thanassi's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 132024: 148%
Dr. Thanassi compared with the California median for emergency medicine physicians, 2024
- Dr. Thanassi
- California median
- Medicare services
- 14vs 26595% below
- Medicare patients
- 25vs 24390% below
- Part D claims
- 85vs 6237% above
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Thanassi'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.
Need commercial claims for Dr. Thanassi?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Thanassi and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Thanassi treated 25 Medicare patients in 2024, average age 62
CMS counts 25 Medicare patients who saw Dr. Thanassi in 2024. The largest group is under 65, with 11 patients. 60% of them have high blood pressure, and 60% have high cholesterol. Their average risk score is 1.54, 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. Thanassi's median patient age at 44, with 56% women.
Medicare patients, 202425
Average age62
Average risk score1.54
Dr. Thanassi's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Thanassi's Medicare patients by sex, 2024
- Women1456%
- Men1144%
Chronic conditions among Dr. Thanassi's Medicare patients, 2024
- High blood pressure60%
- High cholesterol60%
- Arthritis56%
Share of Medicare patients with each condition. A patient can have several.
Dr. Thanassi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 44
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Thanassi wrote 212 Medicare Part D claims in 2024
In 2024, Dr. Thanassi wrote 212 Medicare Part D claims for 131 patients. 80% of them were for generic drugs. CMS names the drug for 85 of them, across 5 drugs with 11 or more claims each, at $1,875 in total drug cost. In 2023, CMS named 53 claims across 4 drugs.
Part D claims, 2024212
Drugs named by CMS5
Total drug cost$1,875
Part D patients131
Dr. Thanassi's Part D claims by kind of drug, 2024
- Generic169 claims80%
- Brand-name and other43 claims20%
Dr. Thanassi'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. Thanassi's Part D claims, 2024
- Antibiotics20%42 of 212 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: 532024: 8560%
Drugs named by CMS: 5 in 2024, 4 in 2023.
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
For MedTech and pharma teams
Find emergency medicine physicians like Dr. Thanassi 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.
Dr. Mark Thanassi has 3 publications on record
Dmand AI links 3 papers to Dr. Thanassi, published from 2012 to 2019.
Papers3
Years published2012 to 2019
Recent publications by Dr. Thanassi
CaliciviridaeCaliciviridae InfectionsDiarrhea
See who Dr. Thanassi researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Thanassi works with, so you can find a warm path to the right emergency medicine physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark Thanassi received $29 in industry payments in 2019
CMS Open Payments shows 1 general payment to Dr. Thanassi from 1 drug or device company in 2019. Food and beverage make up the largest share, 100% of the total. Bausch Health Americas, Inc. paid the most, $29.
Companies that paid Dr. Thanassi the most, 2019 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Thanassi graduated from The Robert Larner, M.D. College of Medicine
Dr. Thanassi graduated from The Robert Larner, M.D. College of Medicine in 1993.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Mark Thanassi accepts plans from 1 insurance carrier
Dr. Thanassi is in network with 1 carrier, including Kaiser Permanente. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
Plan types Dr. Thanassi accepts, by number of carriers
- EPO1
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Mark Thanassi'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) |
| 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 Dr. Mark Thanassi
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. Mark Thanassi's NPI number?
Dr. Mark Thanassi's NPI number is 1104903038. It was assigned on October 31, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Thanassi?
Dr. Mark Thanassi is an emergency medicine physician in Santa Clara, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Mark Thanassi practice?
Dr. Thanassi practices at 700 Lawrence Expressway, Santa Clara, CA 95051. Dr. Thanassi's primary practice is Santa Clara Medical Center in Santa Clara, California, part of Kaiser Permanente. Dmand AI also links Dr. Thanassi to 1 group practice or clinic.
What is Dr. Mark Thanassi's office phone number?
The practice phone on file for Dr. Thanassi is (408) 236-6400.
What is Dr. Mark Thanassi's medical license number?
Dr. Thanassi holds California license G86578, one of the licenses on file in 2 states.
Which states has Dr. Mark Thanassi been licensed in?
Dmand AI has state licenses on file for Dr. Thanassi in California (2002 to 2026) and Connecticut (1997 to 2002).
Which hospitals is Dr. Mark Thanassi affiliated with?
Dr. Thanassi practices at Santa Clara Medical Center in Santa Clara, California.
What medical group is Dr. Mark Thanassi part of?
Dr. Thanassi is linked to The Permanente Medical Group, Inc.
Does Dr. Mark Thanassi accept Medicare?
Yes. CMS data shows Dr. Thanassi billed Medicare for 14 services in 2024.
How many Medicare patients does Dr. Mark Thanassi see?
CMS counts 25 Medicare patients who saw Dr. Thanassi in 2024, with an average age of 62.
Show 8 more questionsShow fewer questions
Is Dr. Mark Thanassi board certified?
Yes. Dr. Thanassi is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Mark Thanassi bill to Medicare?
In 2024, Dr. Thanassi's most billed Medicare services were emergency department visit (99284).
Where did Dr. Mark Thanassi go to medical school?
Dr. Thanassi graduated from The Robert Larner, M.D. College of Medicine in 1993.
What drugs does Dr. Mark Thanassi prescribe most?
In 2024 Medicare Part D data, Dr. Thanassi's most prescribed drugs by claims were Prednisone, Alvesco and Naproxen.
Has Dr. Mark Thanassi received payments from drug or device companies?
CMS Open Payments shows $29 in general payments to Dr. Thanassi from 1 company from 2019 to 2019. The largest total came from Bausch Health Americas, Inc.
How long has Dr. Mark Thanassi been practicing?
Dr. Thanassi graduated from medical school in 1993, 33 years ago.
Does Dr. Mark Thanassi do research?
Dmand AI links 3 publications to Dr. Thanassi, published from 2012 to 2019.
What insurance does Dr. Mark Thanassi accept?
Dr. Thanassi is in network with 1 carrier, including Kaiser Permanente. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
Selling to emergency medicine practices?
See emergency medicine physicians 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