Karl Marzec, M.D.
Emergency Medicine Physician · San Diego, CA
Karl Marzec, M.D. is an emergency medicine physician with a practice address in San Diego, California, and NPI 1447520473, issued on Jan 6, 2012. Check the license (California A119448, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karl Marzec
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A119448 CA
Self-reported in NPPES; status is on the state search - Practice location
- 7901 Frost St, San Diego, CA 92123
- Phone
- (858) 939-3400
- Enumerated
- Jan 6, 2012
- Record last updated
- Mar 6, 2023
- Medicare enrollment
- Enrolled (PECOS I20140625002708); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 2010
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 7901 Frost St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aileen Afshar, MDInternal Medicine Physician1134689946
- Saad Alkhider, MDInternal Medicine Physician1447712062
- Mustafa Alwash, M.DHospitalist Physician1679936439
- Alexandra Anjier, MDEmergency Medicine Physician1467087510
- Anna Astashchanka, MDPulmonary Disease Physician1821594359
- Amir Bahreman, M.D.Internal Medicine Physician1124249388
Verify Karl Marzec in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A119448Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average emergency medicine physician in 2024
202 Medicare Part D claims for 155 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 36 claims were for opioids.
Most prescribed
- Cephalexin36 claims
- Tramadol Hcl29 claims
- Famotidine13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Scripps HealthSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karl Marzec among 7,751 emergency medicine physician records in California
Karl Marzec, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 63% of them.
- NPI issued2012 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2010 · median 2011 among the 4,560 with a school on file
- Record last updated2023 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Diego → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Joseph Bellezzo, M.D.San Diego, CA 921231760450340
- William Carter, M.D.San Diego, CA 921231457329062
- Delbert Clark, D.O.San Diego, CA 921231194799593
- Heather Conrad, M.D.San Diego, CA 921231205813409
- Andrew Desjardins, M.D.San Diego, CA 921231396713103
- William Fornaciari, M.D.San Diego, CA 921231083682546
- Lolie Fromm, M.D.San Diego, CA 921231457329096
- Arthur Gruen, M.D.San Diego, CA 921231376511303
Common questions
What is Karl Marzec, M.D.'s NPI number?
Karl Marzec, M.D.'s National Provider Identifier (NPI) is 1447520473, issued on Jan 6, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Karl Marzec, M.D. located?
The NPPES record lists a practice address at 7901 Frost St, San Diego, CA, 92123. Phone: (858) 939-3400. Providers update this record themselves, so call before visiting.
How can I verify Karl Marzec, M.D.'s license?
NPPES lists California license number A119448, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Karl Marzec, M.D. prescribe under Medicare Part D?
In 2024, Karl Marzec, M.D. had 202 Medicare Part D claims for 155 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.