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

John Mersch III, MD

Individual provider Pediatrics Physician · NPI 1588769558

John Mersch III, MD is a Pediatrics Physician in Ladera Ranch, California. Licensed in California. Registered with an NPI since 2006.

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

777 Corporate Dr Ste 250
Ladera Ranch, CA 92694-2135
Phone: (949) 388-1798
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pediatrics Physician (primary) Taxonomy 208000000X · Licence G40887 (CA)

Record details

NPI number1588769558
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 14, 2006
Last updated in NPPESMarch 13, 2012
Mailing address23321 El Toro Rd, Suites F&G, Lake Forest, CA 92630-4825

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