Justin Defendis Mertens

Primary specialty

Certified Registered Nurse AnesthetistTaxonomy code 367500000X

License

95002820 Issued in CA

Practice address

8840 N Fuller Ave
Fresno, CA 93720-1626

Phone

(559) 367-4171

NPI assigned

Jan 17, 2024

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Enrollment records 1

Specialty

Certified Registered Nurse Anesthetist (Crna)

Education

National Medical University, 2025

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Anesthesia Consultants of FresnoGroup PAC ID 8527967082, 64 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Saint Agnes Medical Center Hospital, Fresno, CA, CCN 050093

Medicare enrollment (NPD)

Enrolled

Practice roles

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.

• Anesthesia Consultants of Fresno

  • Anesthesiology Physician
  • Fresno, CA
  • NPI 1124058177
  Medicare reassignment Care Compare group NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Saint Agnes Medical Center

  • General Acute Care Hospital
  • Fresno, CA
  • NPI 1205845567
  Care Compare affiliation

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

{
    "created_epoch": "1705449600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1773705600000",
    "number": "1073374146",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8840 N FULLER AVE",
            "city": "FRESNO",
            "state": "CA",
            "postal_code": "937201626",
            "telephone_number": "559-367-4171"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "8840 N FULLER AVE",
            "city": "FRESNO",
            "state": "CA",
            "postal_code": "937201626",
            "telephone_number": "559-367-4171"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MERTENS",
        "first_name": "JUSTIN",
        "middle_name": "DEFENDIS",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2024-01-17",
        "last_updated": "2026-03-17",
        "certification_date": "2026-03-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "367500000X",
            "taxonomy_group": "",
            "desc": "Nurse Anesthetist, Certified Registered",
            "state": "CA",
            "license": "95002820",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jennifer Lee Merritt, MHRS
• Kara Merritt, NP
• Graeme Finn Merrow, PHARMD
• Rachel Dee Merryman
• Gwen Elizabeth Merryweather
• David Merzel, M.D.
• Nicole Mesa
• Paolo M Mesde
• Sean Meshkin, D.O
• Vartanush Mesropyan

• Certified Registered Nurse Anesthetist in Fresno, CA
• Providers in Fresno, CA by specialty
• Certified Registered Nurse Anesthetist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 17, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.