Mariel Fahnline McGuiness, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

35.150329 Issued in OH

Practice address

3691 Ridge Mill Dr
Hilliard, OH 43026-7752

Phone

(614) 293-5123

Fax

(614) 293-4890

NPI assigned

Mar 26, 2020

Last updated

Feb 26, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 1

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

Specialty

Internal MedicineAlso: Pediatric Medicine

Education

Ohio State University College of Medicine, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Osu General Internal Medicine LLCGroup PAC ID 7517103955, 270 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Ohio State University State Health System Hospital, Columbus, OH, CCN 360085
• James Cancer Hospital & Solove Research Institute Hospital, Columbus, OH, CCN 360242
• Nationwide Children's Hospital Hospital, Columbus, OH, CCN 363305

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Osu General Internal Medicine LLC

  • Internal Medicine Physician
  • Columbus, OH
  • NPI 1689919599
  Medicare reassignment Care Compare group NPD
• Nationwide Children's Hospital

  • Multi-Specialty Clinic/Center
  • Columbus, OH
  • NPI 1851179873

  Pediatrics

  Medicare reassignment NPD
• Pediatric Academic Association, Inc.

  • Pediatrics Physician
  • Columbus, OH
  • NPI 1063419943
  Medicare reassignment NPD
• Nationwide Children's Hospital

  dba Nationwide Children's Hospital Pharmacy

  • Durable Medical Equipment & Medical Supplies
  • Columbus, OH
  • NPI 1447061262
  NPD
• Nationwide Children's Hospital

  • Dental Clinic/Center
  • Columbus, OH
  • NPI 1407013964
  NPD (past)

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

• Arthur G James Cancer Hospital and Research Institute

  • Special Hospital
  • Columbus, OH
  • NPI 1124127683
  Care Compare affiliation
• Nationwide Children's Hospital

  • General Acute Care Hospital
  • Columbus, OH
  • NPI 1134152986
  Care Compare affiliation
• Ohio State University Hospitals

  dba Ohio State University Dodd Rehabilitation Hospital

  • Rehabilitation Hospital Unit
  • Columbus, OH
  • NPI 1184723637
  Care Compare affiliation
• Ohio State University Hospitals

  • General Acute Care Hospital
  • Columbus, OH
  • NPI 1447359997
  Care Compare affiliation
• Ohio State University Hospitals

  dba Ohio State University Harding Hospital

  • Psychiatric Hospital Unit
  • Columbus, OH
  • NPI 1790876183
  Care Compare affiliation

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

{
    "created_epoch": "1585180800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1772064000000",
    "number": "1356978399",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "700 ACKERMAN RD STE 2120",
            "city": "COLUMBUS",
            "state": "OH",
            "postal_code": "432021559",
            "telephone_number": "614-293-5123",
            "fax_number": "614-293-4890"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3691 RIDGE MILL DR",
            "city": "HILLIARD",
            "state": "OH",
            "postal_code": "430267752",
            "telephone_number": "614-293-5123",
            "fax_number": "614-293-4890"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "4363 All Seasons Dr",
            "address_purpose": "LOCATION",
            "city": "Hilliard",
            "state": "OH",
            "postal_code": "430262050",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "7450 Hospital Dr",
            "address_purpose": "LOCATION",
            "city": "Dublin",
            "state": "OH",
            "postal_code": "430169642",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1405 S High St",
            "address_purpose": "LOCATION",
            "city": "Columbus",
            "state": "OH",
            "postal_code": "432071043",
            "country_code": "US",
            "telephone_number": "614-355-9000",
            "fax_number": "614-355-9010",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "700 Childrens Dr",
            "address_purpose": "LOCATION",
            "city": "Columbus",
            "state": "OH",
            "postal_code": "432052664",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1800 Heinzerling Dr",
            "address_purpose": "LOCATION",
            "city": "Columbus",
            "state": "OH",
            "postal_code": "432233642",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "830 W High St",
            "address_purpose": "LOCATION",
            "city": "Lima",
            "state": "OH",
            "postal_code": "458013971",
            "country_code": "US",
            "telephone_number": "614-726-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "150 W Main St",
            "address_purpose": "LOCATION",
            "city": "New Albany",
            "state": "OH",
            "postal_code": "430549229",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "26 Hospital Dr",
            "address_purpose": "LOCATION",
            "city": "Athens",
            "state": "OH",
            "postal_code": "457012471",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "433 N Cleveland Ave",
            "address_purpose": "LOCATION",
            "city": "Westerville",
            "state": "OH",
            "postal_code": "430828095",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "555 S 18th St",
            "address_purpose": "LOCATION",
            "city": "Columbus",
            "state": "OH",
            "postal_code": "432052654",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "5665 Venture Dr",
            "address_purpose": "LOCATION",
            "city": "Dublin",
            "state": "OH",
            "postal_code": "430172159",
            "country_code": "US",
            "telephone_number": "614-722-6200",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MCGUINESS",
        "first_name": "MARIEL",
        "middle_name": "FAHNLINE",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2020-03-26",
        "last_updated": "2026-02-26",
        "certification_date": "2026-02-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "OH",
            "license": "35.150329",
            "primary": true
        },
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "OH",
            "license": "35.150329",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0406338",
            "state": "OH"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Joslyn McGee, SWT
• Kacey McGough, R.PH,, PHARM.D.
• Patricia McGrath, LPCC-S, LICDC, NCC
• Brianna McGraw, LSW
• Molly McGraw
• MCH of Ohio, Inc. (MCH Columbus)
• Alexandra McKenna, DO
• Megan E McNicholl, PT
• Medical Center of Ohio, LLC
• Austin J Meek, M.D.

• Internal Medicine Physician in Hilliard, OH
• Providers in Hilliard, 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 Feb 26, 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.
• 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.