Mariel Fahnline McGuiness, MD
Internal Medicine Physician · Hilliard, OH
Mariel Fahnline McGuiness, MD is an internal medicine physician with a practice address in Hilliard, Ohio, and NPI 1356978399, issued on Mar 26, 2020. Check the license (Ohio 35.150329, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Mariel Fahnline McGuiness
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 35.150329 OH
Self-reported in NPPES; status is on the state search - Practice location
- 3691 Ridge Mill Dr, Hilliard, OH 43026
- Phone
- (614) 293-5123
- Enumerated
- Mar 26, 2020
- Record last updated
- Feb 26, 2026
- Fax
- (614) 293-4890
- Medicaid ID
- 0406338 OH
- Medicare enrollment
- Enrolled (PECOS I20240612001263); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,277 in Ohio → Look up another NPI →
Also registered at 3691 Ridge Mill Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Susan Friedman, MDInternal Medicine Physician1518250588
- Christopher Hanks, MDInternal Medicine Physician1801057385
- David Li, MDNephrology Physician1225526775
- Rachael Menssen, LISWClinical Social Worker1245058494
Verify Mariel Fahnline McGuiness in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35.150329Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average internal medicine physician in 2024
98 Medicare Part D claims for 25 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Osu General Internal Medicine LLCHilliard, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mariel Fahnline McGuiness among 5,277 internal medicine physician records in Ohio
Mariel Fahnline McGuiness, MD is one of 5,277 internal medicine physician records with a practice address in Ohio. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 85% of them.
- NPI issued2020 · 85% of these records are older, 12% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2020 · median 2006 among the 3,414 with a school on file
- Record last updated2026 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 internal medicine physician records list a practice address in Hilliard
They are 19 of the 1,149 NPPES records with a practice address in Hilliard, and 5,277 internal medicine physician records in Ohio.
All 5,277 in Ohio → Every provider in Hilliard → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mariam Benjamin, M.D.Hilliard, OH 430261700954237
- Robert Cronin, MDHilliard, OH 430261912140427
- Kenneth Ecker, M.D.Hilliard, OH 430261912132622
- Susan Friedman, MDHilliard, OH 430261518250588
- Christopher Hanks, MDHilliard, OH 430261801057385
- Julianne Huefner, MDHilliard, OH 430261154385680
- Dong Hui Kang, MDHilliard, OH 430261144310913
- Steven Lichtblau, MDHilliard, OH 430261679651020
Common questions
What is Mariel Fahnline McGuiness, MD's NPI number?
Mariel Fahnline McGuiness, MD's National Provider Identifier (NPI) is 1356978399, issued on Mar 26, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Mariel Fahnline McGuiness, MD located?
The NPPES record lists a practice address at 3691 Ridge Mill Dr, Hilliard, OH, 43026. Phone: (614) 293-5123. Providers update this record themselves, so call before visiting.
How can I verify Mariel Fahnline McGuiness, MD's license?
NPPES lists Ohio license number 35.150329, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mariel Fahnline McGuiness, MD prescribe under Medicare Part D?
In 2024, Mariel Fahnline McGuiness, MD had 98 Medicare Part D claims for 25 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.