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

Individual provider Emergency Medicine Physician · NPI 1275639379

Dr. John Francis Zambetti, MD practises Emergency Medicine in Lancaster, California. Graduated from New York Medical College in 1975, 51 years ago. Practices with Lakeside Medical Organization a Medical Group Inc, a 65-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
51
Trained at
New York Medical College
Licensed in
CA
In the registry since
2006
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

43839 15th St W
Lancaster, CA 93534-4756 Not confirmed with CMS for 15 years — call before visiting
Phone: (661) 945-5984
Fax: (661) 723-6446
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence G33362 (CA)

Record details

NPI number1275639379
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 15, 2006
Last updated in NPPESApril 15, 2011

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 1975 (51 years in practice)
Group practice Lakeside Medical Organization A Medical Group Inc — 65 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients127
Services billed 445 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Lakeside Medical Organization a Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 65 clinicians in the practice; 12 are shown here.

Other providers in Lancaster