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MARIEL FAHNLINE MCGUINESS MD
NPI 1356978399
Internal Medicine in Hilliard, OH

Active since March 26, 2020PECOS EnrolledAccepts Medicare Assignment
3691 RIDGE MILL DR, HILLIARD, OH 43026(614) 293-5123(614) 293-4890 Get Directions Write a Review

NPPES record last updated: February 26, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Sep 8, 2025, May 13, 2024, Jun 10, 2020 and 2 more (5 updates tracked since 2020).

About Mariel Fahnline Mcguiness Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARIEL FAHNLINE MCGUINESS MD (NPI 1356978399) is an individual internal medicine provider in Hilliard, Ohio, licensed in Ohio (35.150329) and active in the NPI registry since March 2020. She is enrolled in Medicare PECOS, is affiliated with Ohio State University State Health System, and maintains 11 additional practice locations.

NPPES Registry Identity

NPI1356978399
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameMARIEL FAHNLINE MCGUINESSCredential: MD
Location Address3691 RIDGE MILL DRHilliard, OH 43026-7752
Mailing Address700 Ackerman Rd Ste 2120Columbus, OH 43202-1559 · (614) 293-5123 · Fax (614) 293-4890
Phone(614) 293-5123
Fax(614) 293-4890
Sole ProprietorNo
Medical School CMSOhio State University College Of MedicineGraduated 2020
Enumeration DateMarch 26, 2020
Last NPPES UpdateFebruary 26, 20265 updates tracked since enumeration
NPPES CertifiedFebruary 26, 2026
✔ NPI 1356978399 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in OH · 35.150329
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedPediatricsTaxonomy 208000000X · License 35.150329 (OH)
3691 RIDGE MILL DR, Hilliard, OH 43026
Open in Google Maps ↗

Secondary Practice Locations 11

Location 11405 S High StColumbus, OH 43207-1043 · Phone (614) 355-9000 · Fax (614) 355-9010
Location 2700 Childrens DrColumbus, OH 43205-2664 · Phone (614) 722-6200
Location 3830 W High StLima, OH 45801-3971 · Phone (614) 726-6200
Location 41800 Heinzerling DrColumbus, OH 43223-3642 · Phone (614) 722-6200
Location 5555 S 18th StColumbus, OH 43205-2654 · Phone (614) 722-6200
Location 64363 All Seasons DrHilliard, OH 43026-2050 · Phone (614) 722-6200
Location 75665 Venture DrDublin, OH 43017-2159 · Phone (614) 722-6200
Location 8433 N Cleveland AveWesterville, OH 43082-8095 · Phone (614) 722-6200
Location 926 Hospital DrAthens, OH 45701-2471 · Phone (614) 722-6200
Location 10150 W Main StNew Albany, OH 43054-9229 · Phone (614) 722-6200
Location 117450 Hospital DrDublin, OH 43016-9642 · Phone (614) 722-6200

Other Identifiers 1

Medicaid0406338OH

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mariel Fahnline Mcguiness Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8527480888
PECOS Enrollment IDI20240612001263
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Mariel Mcguiness reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Osu General Internal Medicine LLC
2.9 mi
Internal Medicine
1800 ZOLLINGER RD
Columbus, OH 43221
  • Reassigned Medicare billing, Ohio enrollment
  • 303 clinicians in this Medicare group
NPI 1689919599 (614) 293-5123
Nationwide Children's Hospital
8.9 mi
Multi-Specialty
700 CHILDRENS DR
Columbus, OH 43205
  • Reassigned Medicare billing, Ohio enrollment
  • 976 clinicians in this Medicare group
NPI 1851179873 (614) 722-2055
Pediatric Academic Association, Inc.
8.9 mi
Pediatrics
700 CHILDRENS DR
Columbus, OH 43205
  • Reassigned Medicare billing, Ohio enrollment
  • 1,246 clinicians in this Medicare group
NPI 1063419943 (614) 722-4579

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Ohio State University State Health System

Acute Care Hospitals · Columbus, OH
4/5 CMS rating
OwnershipGovernment - State
CMS Certification Number360085
Location410 West 10th AvenueColumbus, OH 43210 · Franklin County
Emergency services Birthing friendly

Nationwide Children's Hospital

Childrens · Columbus, OH
OwnershipVoluntary non-profit - Private
CMS Certification Number363305
Location700 Children's DriveColumbus, OH 43205 · Franklin County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 43026 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$126.12 typical visit price
range $54.34 – $166.65
Typical copayment $31.53 (range $13.58 – $41.66)
Most-billed visit code 99204
Established Patient
$96.44 typical visit price
range $17.10 – $135.40
Typical copayment $24.11 (range $4.27 – $33.85)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 19

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NAVIN CHANDRA RAVISHANKAR MD
Internal Medicine (Rheumatology)
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-4837
NATHAN ROBERT RICHARDS MD
Internal Medicine
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-5123
DR. DAVID YUJIE LI MD
Internal Medicine (Nephrology)
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-4837
DUSTIN A PETH DO
Internal Medicine (Sleep Medicine)
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-4925
RACHAEL ELIZABETH MENSSEN LISW
Social Worker (Clinical)
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-5123
ASHLEY NICHOLE TOLER A.T.C., APRN-CNP
Nurse Practitioner
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-5123
DR. NATHANIEL JOHN PARISI MD
Internal Medicine
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-5123
ABIMBOLA A FADAIRO-AZINGE MBBS
Internal Medicine (Rheumatology)
3691 RIDGE MILL DR
HILLIARD, OH 43026
Franklin County (614) 293-4837

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mariel Mcguiness's NPI number?

The NPI number for Mariel Mcguiness is 1356978399. It was assigned to this individual provider in the NPPES registry on March 26, 2020.

Where is Mariel Mcguiness located?

Mariel Mcguiness practices at 3691 Ridge Mill Dr, Hilliard, OH 43026. The listed phone number is (614) 293-5123.

What is Mariel Mcguiness's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mariel Mcguiness enrolled in Medicare?

Yes. Mariel Mcguiness is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Mariel Mcguiness's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mariel Mcguiness reassigns Medicare benefits to 3 organizations: Osu General Internal Medicine LLC (Columbus, OH), Nationwide Children's Hospital (Columbus, OH) and Pediatric Academic Association, Inc. (Columbus, OH). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mariel Mcguiness's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mariel Mcguiness accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and Antidote Health Plan of Ohio, Inc. and 2 other insurers list Mariel Mcguiness as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mariel Mcguiness affiliated with any hospitals?

According to CMS data, Mariel Mcguiness is affiliated with Ohio State University State Health System and Nationwide Children's Hospital.

When was this NPI record last updated?

The NPPES record for Mariel Mcguiness was last updated on February 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.