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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. John Mersch is Excellent. Dr. Mersch has been reviewed by 147 patients who have provided 0 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.2
Promptness 5.0
Courteous Staff 4.3
Accurate Diagnosis 4.9
Bedside Manner 4.9
Spends Time with Me 4.8
Follows Up After Visit 4.8

Specialties & Research

Dr. John Mersch, MD is board certified in Pediatrics.

  • He has special expertise in 2 areas:
  • Asthma
  • Sports Medicine

Education & Awards

Dr. Mersch graduated from University of Southern California , Los Angeles. He has 5 awards.

Patients' Choice 5th Anniversary Award (2013)
Patients' Choice Award (2009 - 2013)
Compassionate Doctor Recognition (2010 - 2013)
Top 10 Doctor - State (2014)
Top 10 Doctor - Metro Area (2014)
Los Angeles Metro Area


Dr. Mersch has 10 hospital affiliations:

  • Saddleback Memorial Medical Center-Laguna Hills 
  • Anaheim Memorial Medical Center 


  • English
  • Spanish

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Additional Information
Dr. John Mersch MD is a male Pediatrician, has 34 years of experience and practices in Pediatrics.
Where does Dr. John Mersch practice?
Dr. John Mersch has 1 office location.
Dr. John Mersch practices Pediatrics near Ladera Ranch, CA.
See Ladera Ranch Pediatricians.