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

Dr. John Arthur Horning, MD

Individual provider Emergency Medicine Physician · NPI 1033148523

Dr. John Arthur Horning, MD is an Emergency Medicine in San Bruno, California. Graduated from Northwestern University Feinberg Medical School in 1993, 33 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California and Montana.

Years since qualifying
33
Trained at
Northwestern University Feinberg Medical School
Licensed in
CA, MT
In the registry since
2006
Specialties on file
2
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

841 San Bruno Ave W Ste 100
San Bruno, CA 94066-3443
Phone: (415) 300-4436
Fax: (415) 367-1514
Show map & directions

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

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence G85580 (CA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 33421 (MT)

Record details

NPI number1033148523
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 30, 2006
Last updated in NPPESJuly 8, 2022
Certification dateJuly 8, 2022

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1993 (33 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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