Mariel Fahnline Mcguiness, MD
Internal Medicine · Hilliard, OH
At a glance
3691 Ridge Mill Dr, Hilliard, OH 43026-7752
NPPES record updated Feb 26, 2026. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
3691 Ridge Mill DrHilliard, OH 43026-7752
Additional reported practice locations
4363 All Seasons DrHilliard, OH 430262050
Phone: 6147226200 7450 Hospital Dr
Dublin, OH 430169642
Phone: 6147226200 1405 S High St
Columbus, OH 432071043
Phone: 6143559000
Fax: 6143559010 700 Childrens Dr
Columbus, OH 432052664
Phone: 6147226200 1800 Heinzerling Dr
Columbus, OH 432233642
Phone: 6147226200 830 W High St
Lima, OH 458013971
Phone: 6147266200 150 W Main St
New Albany, OH 430549229
Phone: 6147226200 26 Hospital Dr
Athens, OH 457012471
Phone: 6147226200 433 N Cleveland Ave
Westerville, OH 430828095
Phone: 6147226200 555 S 18Th St
Columbus, OH 432052654
Phone: 6147226200 5665 Venture Dr
Dublin, OH 430172159
Phone: 6147226200
Education & affiliations
- Medical / professional school
- Ohio State University College Of Medicine
- Graduation year
- 2020
- CMS specialties
- Internal Medicine · Pediatric Medicine
CMS reports telehealth services for this clinician. Confirm current services and availability with the practice.
Practice groups
Reported hospital affiliations
- Nationwide Children's Hospital Columbus, OH
- Ohio State University State Health System Columbus, OH
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Service-mix comparison is unavailable for this NPI in the imported Medicare service file.
Industry-reported general payments
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Internal Medicine
- Taxonomy code
- 207R00000X
- Enumeration date
- Mar 26, 2020
- Record updated
- Feb 26, 2026
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
207R00000X · Primary
License reported: 35.150329 OH
208000000X
License reported: 35.150329 OH
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
3691 Ridge Mill DrHilliard, OH 43026-7752
- Phone
- (614) 293-5123
- Fax
- (614) 293-4890
Mailing address
700 ACKERMAN RD STE 2120COLUMBUS, OH 432021559
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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