Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark Allen Rosen, MD

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1427108851

Dr. Mark Allen Rosen, MD is an Internal Medicine in Orange, California. Graduated from Loyola University of Chicago, Stritch School of Medicine in 1979, 47 years ago. Practices with Uc Regents, a 306-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
47
Trained at
Loyola University of Chicago, Stritch School of Medicine
Licensed in
CA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

101 The City Dr S Bldg 53 Rm 119 RT 81
Orange, CA 92868-3201
Phone: (714) 456-5150
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Critical Care Medicine (Internal Medicine) Physician (primary) Taxonomy 207RC0200X · Licence G43522 (CA)

Record details

NPI number1427108851
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 10, 2007
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesPULMONARY DISEASE
Medical schoolLOYOLA UNIVERSITY OF CHICAGO, STRITCH SCHOOL OF MEDICINE
Graduated 1979 (47 years in practice)
Group practice Uc Regents — 306 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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