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John Mersch, M.D.
NPI 1588769558 · Pediatrics Physician · Ladera Ranch, CA
John Mersch, M.D. is a Pediatrics Physician provider in Ladera Ranch, CA (NPI 1588769558).
Provider details
- NPI number
- 1588769558
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G40887 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
777 Corporate Dr
Suite 250
Ladera Ranch, CA 92694-2135
Phone: (949) 388-1798
Street-level locationGet directions
Mailing address
23321 El Toro Rd
Lake Forest, CA 92630-4825
Registry dates
- Enumerated
- 2006-09-14
- Last updated
- 2012-03-13
Frequently asked questions
- What is John Mersch's NPI number?
- John Mersch's National Provider Identifier (NPI) is 1588769558, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mersch's specialty?
- John Mersch is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is John Mersch located?
- John Mersch's practice location on file with NPPES is 777 Corporate Dr, Ladera Ranch, CA 92694-2135.
- What is John Mersch's phone number?
- The practice phone number listed in the NPPES registry for John Mersch is (949) 388-1798.
- Is John Mersch's NPI active?
- Yes — John Mersch's NPI (1588769558) is active in the NPPES registry as of the last update on 2012-03-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.