John Joseph Ondrejka, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

35-055148 Issued in OH

Practice address

7956 Tyler Blvd
Mentor, OH 44060-4806

Phone

(440) 716-1283

Fax

(440) 716-1605

NPI assigned

Mar 28, 2006

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Other identifiers 7

Medicare fee-for-service enrollment

Enrolled in OH

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Lake Hospital System Inc

  • Family Medicine Physician
  • Middlefield, OH
  • NPI 1952339996

  Internal Medicine

  Medicare reassignment NPD
• Lake Hospital System Inc

  • Pediatrics Physician
  • Madison, OH
  • NPI 1932143856
  NPD
• Lake Hospital System, Inc

  • Urgent Care Clinic/Center
  • Chardon, OH
  • NPI 1689634966

  Internal Medicine

  NPD
• Lake Hospital System

  • Obstetrics & Gynecology Physician
  • Willoughby, OH
  • NPI 1346202512
  NPD (past)
• Lake Hospital System Inc

  • Physician Assistant
  • Concord TWP, OH
  • NPI 1851698435
  NPD (past)
• Lake Hospital System Inc.

  • Adult Health Nurse Practitioner
  • Concord TWP, OH
  • NPI 1043275837
  NPD (past)
• Lake Hospital System Inc.

  • Urgent Care Clinic/Center
  • Willowick, OH
  • NPI 1912967209

  Internal Medicine

  NPD (past)
• Lake Hospital System, Inc

  • Urgent Care Clinic/Center
  • Madison, OH
  • NPI 1134189376

  Internal Medicine

  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1143504000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1770543159",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "510 5TH AVE",
            "city": "CHARDON",
            "state": "OH",
            "postal_code": "440241076",
            "telephone_number": "440-286-8908",
            "fax_number": "440-279-1527"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "7956 TYLER BLVD",
            "city": "MENTOR",
            "state": "OH",
            "postal_code": "440604806",
            "telephone_number": "440-716-1283",
            "fax_number": "440-716-1605"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ONDREJKA",
        "first_name": "JOHN",
        "middle_name": "JOSEPH",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-28",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "OH",
            "license": "35-055148",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "UNITED HEALTHCARE",
            "identifier": "6600162",
            "state": "OH"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2073581",
            "state": "OH"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "QUALCHOICE",
            "identifier": "80507",
            "state": "OH"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "ANTHEM",
            "identifier": "000000339419",
            "state": "OH"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "DEPT OF LABOR",
            "identifier": "264200000",
            "state": "OH"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICAL MUTUAL OF OHIO",
            "identifier": "341425870042",
            "state": "OH"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "FEDERAL BLACK LUNG",
            "identifier": "264200000",
            "state": "OH"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Ohio Physical Therapy Services of Mentor LLC
• Ohio Renal Care Group, LLC
• Ohios Center for of&I Surgery Inc
• Christine M Oleniacz, MA, LPCC
• Rachael Sue Olinger, AUD
• Denica Oneil
• Michael Oneill, LPN
• Chidubem Onuorah
• Janet H. Opatrny
• Ophthalmic Physicians, Inc

• Internal Medicine Physician in Mentor, OH
• Providers in Mentor, OH by specialty
• Internal Medicine Physician in Ohio

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.