Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Joseph Ondrejka, MD

Internal Medicine Physician in Mentor, OH · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1770543159

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Registry record

Entity type Individual (Type 1)

Name Dr. John Joseph Ondrejka

Credential MD

Sex Male

Practice address 7956 Tyler Blvd, Mentor, OH, 44060

Phone (440) 716-1283

Fax (440) 716-1605

Enumeration date Mar 28, 2006

Last updated in NPPES Feb 22, 2016

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 35-055148 (OH) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
6600162	Other	OH	UNITED HEALTHCARE
2073581	Medicaid	OH	-
80507	Other	OH	QUALCHOICE
000000339419	Other	OH	ANTHEM
264200000	Other	OH	DEPT OF LABOR
341425870042	Other	OH	MEDICAL MUTUAL OF OHIO
264200000	Other	OH	FEDERAL BLACK LUNG

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Where does John Ondrejka practice?

The practice location on file with NPPES is in Mentor, OH. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for John Ondrejka?

The National Provider Identifier (NPI) for John Ondrejka is 1770543159, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Lake Hospital System, Inc Urgent Care Clinic/Center · Mentor, OH NPI 1205896404 David Bowe Pediatrics Physician · Mentor, OH NPI 1164482675 Meredith Gajda Nurse Practitioner · Mentor, OH NPI 1326289794 Lake Hospital System, Inc. Sports Medicine (Family Medicine) Physician · Mentor, OH NPI 1669783593 Center for Molecular Cancer Diagnostics, Inc Clinical Medical Laboratory · Mentor, OH NPI 1316378789 Adam Ridenour Nurse Practitioner · Mentor, OH NPI 1649793241

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-02-22.