Mark Tamsen, MD
NPI 1346241452 · Emergency Medicine Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Tamsen, MD is a Emergency Medicine Physician provider in San Diego, CA (NPI 1346241452).
Provider details
- NPI number
- 1346241452
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G64400 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
835 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 359 | $126 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 194 | $175 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 105 | $166 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 60 | $15 |
| Manual Urinalysis Test With Examination Using Microscope, Automated81001 | 59 | $3 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 59 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cefuroxime Axetilbrand: Cefuroxime | 193 | 126 |
| Doxycycline Hyclate | 183 | 118 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 123 | 47 |
| Amlodipine Besylate | 114 | 17 |
| Naproxen | 112 | 61 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 102 | 12 |
| Sulfamethoxazole/Trimethoprim |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-10
- Last updated
- 2020-12-16
- Certified
- 2020-12-16
Frequently asked questions
- What is Mark Tamsen's NPI number?
- Mark Tamsen's National Provider Identifier (NPI) is 1346241452, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Tamsen's specialty?
- Mark Tamsen is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Tamsen located?
- Mark Tamsen's practice location on file with NPPES is 3434 Midway Dr Ste 1002, San Diego, CA 92110-4924.
- What is Mark Tamsen's phone number?
- The practice phone number listed in the NPPES registry for Mark Tamsen is (619) 225-6200.
- Does Mark Tamsen accept Medicare?
- Mark Tamsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Tamsen's NPI active?
- Yes — Mark Tamsen's NPI (1346241452) is active in the NPPES registry as of the last update on 2020-12-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.