Onto Fertility Lab of Illinois, LLC

Primary specialty

Reproductive Endocrinology PhysicianTaxonomy code 207VE0102X

Legal business name

ONTO FERTILITY LAB OF ILLINOIS, LLC

Practice address

371 W Ontario St
Chicago, IL 60654-5716

Phone

(312) 724-8448

Fax

(312) 724-8448

NPI assigned

Jan 23, 2026

Organization subpart

No

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

Authorized official

Name

Jennifer Teschendorf

Title

RCM Consultant

Phone

(612) 458-8050

Specialties & licenses 1

Addresses

Other names 1

• Onto Health Doing business as

Locations

Practitioners 2

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles.

• Victoria Larsen

  • Women's Health Nurse Practitioner
  • Chicago, IL
  • NPI 1841899283
  NPD (past)
• Roohi Najeemuddin, M.D.

  • Reproductive Endocrinology Physician
  • Chicago, IL
  • NPI 1619302411
  NPD (past)

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

{
    "created_epoch": "1769126400000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1769126400000",
    "number": "1073462099",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1130 S CANAL ST",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606075058",
            "telephone_number": "312-724-8448",
            "fax_number": "312-724-8448"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "371 W ONTARIO ST",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606545716",
            "telephone_number": "312-724-8448",
            "fax_number": "312-724-8448"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1528 Aurora Ave",
            "address_purpose": "LOCATION",
            "city": "Naperville",
            "state": "IL",
            "postal_code": "605406210",
            "country_code": "US",
            "telephone_number": "312-724-8448",
            "fax_number": "312-724-8448",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "2567 W Golf Rd",
            "address_purpose": "LOCATION",
            "city": "Hoffman Estates",
            "state": "IL",
            "postal_code": "601691165",
            "country_code": "US",
            "telephone_number": "312-724-8448",
            "fax_number": "312-724-8448",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "520 W Touhy Ave",
            "address_purpose": "LOCATION",
            "city": "Park Ridge",
            "state": "IL",
            "postal_code": "600684276",
            "country_code": "US",
            "telephone_number": "312-724-8448",
            "fax_number": "312-724-8448",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "organization_name": "ONTO FERTILITY LAB OF ILLINOIS, LLC",
        "organizational_subpart": "NO",
        "enumeration_date": "2026-01-23",
        "last_updated": "2026-01-23",
        "certification_date": "2026-01-23",
        "status": "A",
        "authorized_official_last_name": "TESCHENDORF",
        "authorized_official_first_name": "JENNIFER",
        "authorized_official_title_or_position": "RCM CONSULTANT",
        "authorized_official_telephone_number": "612-458-8050"
    },
    "taxonomies": [
        {
            "code": "207VE0102X",
            "taxonomy_group": "193200000X MULTI-SPECIALTY GROUP",
            "desc": "Obstetrics & Gynecology, Reproductive Endocrinology",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Onto Health",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

• Onsite Urology LLC
• Ontario Street Operatory
• Ontario Street Operatory Fac
• Ontario Street Surgical Assistants LLC
• Nicole Chappell Ontiveros, MD
• Nathan D Ontrop, M.D.
• Jason K Onugha, MD, MPH
• Doga Duru Onur
• Onward Nursing Healthcare LLC
• Onward Performance Nutrition LLC

• Reproductive Endocrinology Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Reproductive Endocrinology Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 23, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.