Dr. Mark J. Tamsen, MD
- Medicare services, 2024
- 882
- Medicare patients, 2024
- 316
- Part D claims, 2024
- 2,905
- Industry payments
- $63
- Affiliated sites
- 2
- Practice address
- 3434 Midway Dr, San Diego, CA 92110
- Practice phone
- Call (818) 855-1507
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
San Diego Premier Surgery Center
San Diego, California
Find Dr. Tamsen'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 J. Tamsen is an emergency medicine physician in San Diego, California
Dr. Tamsen practices at San Diego Premier Surgery Center in San Diego, California.
Dr. Tamsen's NPI, 1346241452, was assigned on August 10, 2005. Dr. Tamsen graduated from College of Medicine - Tucson in 1979. Dr. Tamsen holds California license G64400.
- NPI
- 1346241452NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2163595752
- NPI enumeration date
- August 10, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (818) 855-1507
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark J. Tamsen practices at San Diego Premier Surgery Center in San Diego, California
Dr. Tamsen's primary practice is San Diego Premier Surgery Center, at 3434 Midway Dr, San Diego, CA 92110 in San Diego County. The practice phone is (818) 855-1507.
- San Diego Premier Surgery Center3434 Midway Dr, San Diego, CA 92110 · San Diego CountyPhone(818) 855-1507
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark J. Tamsen is affiliated with 3 sites of care and 2 medical groups
Dr. Tamsen's primary practice is San Diego Premier Surgery Center in San Diego, California. The medical group on file is Urgent Care & More. Dmand AI also links Dr. Tamsen to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mark J. Tamsen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tamsen practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| San Diego Premier Surgery Center | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark J. Tamsen is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Tamsen's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Tamsen is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Tamsen's licenses on file in 6 states: California, Arizona, Nevada, Florida, Texas and South Carolina.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Arizona license
- Nevada license
- Florida license
- Texas license
- South Carolina license
Emergency medicine physicians near Dr. Tamsen
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. Mark J. Tamsen billed Medicare for 882 services in 2024
CMS data shows 882 Medicare services from Dr. Tamsen across 9 procedure codes in 2024, for 316 Medicare patients. Medicare paid $74,337 for them. Every service was in an office.
Dr. Tamsen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6952024: 7031%
- Tests and treatments
- 2023: 492024: 6022%
- Lab and pathology
- 2023: 562024: 595%
- Drugs given in the office
- 2023: 362024: 4731%
- Imaging
- 2023: 02024: 13
- Other services
- 2023: 172024: 0100%
Dr. Tamsen compared with the California median for emergency medicine physicians, 2024
- Dr. Tamsen
- California median
- Medicare services
- 882vs 2653.3 times
- Medicare patients
- 316vs 24330% above
- Part D claims
- 2,570vs 6241.5 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Tamsen'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. Tamsen 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 J. Tamsen treated 316 Medicare patients in 2024, average age 74
CMS counts 316 Medicare patients who saw Dr. Tamsen in 2024. The largest group is 65 to 74, with 148 patients. 61% of them have high blood pressure, and 59% have high cholesterol. 24% are also on Medicaid. Their average risk score is 1.06, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tamsen's median patient age at 50, with 55% women.
Dr. Tamsen's Medicare patients by age, 2024
Dr. Tamsen's Medicare patients by sex, 2024
- Women18358%
- Men13342%
Chronic conditions among Dr. Tamsen's Medicare patients, 2024
- High blood pressure61%
- High cholesterol59%
- Arthritis45%
- Mood disorders24%
- Anxiety23%
- COPD22%
- Diabetes22%
- Depression21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Tamsen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 50
Patient panel by sex, all payers
- Women55%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark J. Tamsen wrote 2,905 Medicare Part D claims in 2024
In 2024, Dr. Tamsen wrote 2,905 Medicare Part D claims for 467 patients. 94% of them were for generic drugs. CMS names the drug for 2,570 of them, across 59 drugs with 11 or more claims each, at $39,057 in total drug cost. In 2023, CMS named 2,303 claims across 53 drugs.
Dr. Tamsen's Part D claims by kind of drug, 2024
- Generic2,734 claims94%
- Brand-name and other171 claims6%
Dr. Tamsen'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. Tamsen's Part D claims, 2024
- Opioids6%183 of 2,905 claims
- Antibiotics27%775 of 2,905 claims
- Antipsychotics, patients 65 and over0%12 of 2,905 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: 2,3032024: 2,57012%
Drugs named by CMS: 59 in 2024, 53 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
Dr. Mark J. Tamsen scored 0 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 0 out of 100 for Dr. Tamsen for performance year 2024, reported individually. Dr. Tamsen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Tamsen's MIPS scores, performance year 2024
- 0of 100Final score
- 0of 100Quality
- 0of 100Improvement Activities
- 0of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Mark J. Tamsen received $63 in industry payments from 2020 to 2023
CMS Open Payments shows 3 general payments to Dr. Tamsen from 3 drug and device companies from 2020 to 2023. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $26.
General payments to Dr. Tamsen by program year, 2020 to 2023
Companies that paid Dr. Tamsen the most, 2020 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark J. Tamsen has 1 award and honors on record
Dmand AI lists 1 award for Dr. Tamsen.
Awards and honors for Dr. Tamsen
- Undated
- Checkbook Top Doc
Source: Dmand AI Professional Profile Data
Dr. Mark J. Tamsen graduated from College of Medicine - Tucson
Dr. Tamsen graduated from College of Medicine - Tucson in 1979.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Dr. Mark J. Tamsen accepts plans from 1 insurance carrier
Dr. Tamsen 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. Mark J. Tamsen'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Awards and committee roles | Dmand AI Professional Profile Data |
| 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 J. Tamsen
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 J. Tamsen's NPI number?
Dr. Mark J. Tamsen's NPI number is 1346241452. It was assigned on August 10, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark J. Tamsen?
Dr. Mark J. Tamsen is an emergency medicine physician in San Diego, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Mark J. Tamsen practice?
Dr. Tamsen practices at 3434 Midway Dr, San Diego, CA 92110. Dr. Tamsen's primary practice is San Diego Premier Surgery Center in San Diego, California. Dmand AI also links Dr. Tamsen to 2 group practices and clinics and 1 medical group.
What is Dr. Mark J. Tamsen's office phone number?
The practice phone on file for Dr. Tamsen is (818) 855-1507.
What is Dr. Mark J. Tamsen's medical license number?
Dr. Tamsen holds California license G64400, one of the licenses on file in 6 states.
Which states has Dr. Mark J. Tamsen been licensed in?
Dmand AI has state licenses on file for Dr. Tamsen in California (1988 to 2026), Arizona (1980 to 2027), Nevada (1988 to 2011), Florida (1988 to 2004), Texas (1989 to 2000) and South Carolina (1992 to 1993).
What medical group is Dr. Mark J. Tamsen part of?
Dr. Tamsen is linked to Urgent Care & More. Dmand AI links Dr. Tamsen to 1 more medical group.
Does Dr. Mark J. Tamsen accept Medicare?
Yes. CMS data shows Dr. Tamsen billed Medicare for 882 services in 2024, and Dr. Tamsen accepts Medicare assignment.
What is Dr. Mark J. Tamsen's MIPS score?
Dr. Tamsen's MIPS final score for performance year 2024 is 0 out of 100, reported individually.
How many Medicare patients does Dr. Mark J. Tamsen see?
CMS counts 316 Medicare patients who saw Dr. Tamsen in 2024, with an average age of 74.
Show 7 more questionsShow fewer questions
Is Dr. Mark J. Tamsen board certified?
Yes. Dr. Tamsen is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Mark J. Tamsen bill to Medicare?
In 2024, Dr. Tamsen's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99215) and office visit, new patient (99204).
Where did Dr. Mark J. Tamsen go to medical school?
Dr. Tamsen graduated from College of Medicine - Tucson in 1979.
What drugs does Dr. Mark J. Tamsen prescribe most?
In 2024 Medicare Part D data, Dr. Tamsen's most prescribed drugs by claims were Cefuroxime, Doxycycline Hyclate and Albuterol Sulfate Hfa.
Has Dr. Mark J. Tamsen received payments from drug or device companies?
CMS Open Payments shows $63 in general payments to Dr. Tamsen from 3 companies from 2020 to 2023. The largest total came from Abbvie Inc.
How long has Dr. Mark J. Tamsen been practicing?
Dr. Tamsen graduated from medical school in 1979, 47 years ago.
What insurance does Dr. Mark J. Tamsen accept?
Dr. Tamsen 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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