Gary M. Onady, MD, PHD
Internal Medicine Physician · Trenton, OH
Gary M. Onady, MD, PHD is an internal medicine physician with a practice address in Trenton, Ohio, and NPI 1396792347, issued on May 27, 2006. Check the license (Ohio 35.057057, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Gary M. Onady
- Credential
- MD, PHD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 35.057057 OH
Self-reported in NPPES; status is on the state search - Practice location
- 715 W State St, Trenton, OH 45067
- Phone
- (513) 988-6067
- Enumerated
- May 27, 2006
- Record last updated
- Sep 15, 2025
- Fax
- (513) 988-6070
- Medicaid ID
- 0828519 OH
- Medicare enrollment
- Enrolled (PECOS I20061214000187); accepts Medicare assignment
- Medical or professional school
- Wright State University Boonshoft School Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,277 in Ohio → Look up another NPI →
Also registered at 715 W State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kelli Melvin, MDFamily Medicine Physician1447236922
- Katherine Tanis, MSN, APRN, FNP-CNurse Practitioner1942907829
- Krista Young, CNPPrimary Care Nurse Practitioner1699135855
Verify Gary M. Onady in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35.057057Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
62% more Medicare Part D claims than the average internal medicine physician in 2024
5,135 Medicare Part D claims for 365 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims. 40 claims were for opioids.
Most prescribed
- Atorvastatin Calcium365 claims
- Lisinopril165 claims
- Levothyroxine Sodium163 claims
- Amlodipine Besylate160 claims
- Gabapentin145 claims
- Omeprazole141 claims
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
- University OF Cincinnati Physicians Company LLCTrenton, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gary M. Onady among 5,277 internal medicine physician records in Ohio
Gary M. Onady, MD, PHD 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 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated1987 · median 2006 among the 3,414 with a school on file
- Record last updated2025 · 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).
Internal Medicine Physician providers in Ohio
There are 5,277 internal medicine physician records in Ohio.
All 5,277 in Ohio → Every provider in Trenton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mansi Amin, D.OSpringboro, OH 450661780882852
- Connie Ball, MDSpringboro, OH 450661528176393
- Jay Hoffman, MDSpringboro, OH 450661194764811
- Raman Khosla, M.D.Springboro, OH 450661669467783
- Billie Wright, DOSpringboro, OH 450661497735807
- Madhu Chalasani, MDWest Chester, OH 450691780630947
- Edward Drohan, MDWest Chester, OH 450691538138458
- Arnold Drummond, MDWest Chester, OH 450691245209618
Common questions
What is Gary M. Onady, MD, PHD's NPI number?
Gary M. Onady, MD, PHD's National Provider Identifier (NPI) is 1396792347, issued on May 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary M. Onady, MD, PHD located?
The NPPES record lists a practice address at 715 W State St, Trenton, OH, 45067. Phone: (513) 988-6067. Providers update this record themselves, so call before visiting.
How can I verify Gary M. Onady, MD, PHD's license?
NPPES lists Ohio license number 35.057057, 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 Gary M. Onady, MD, PHD prescribe under Medicare Part D?
In 2024, Gary M. Onady, MD, PHD had 5,135 Medicare Part D claims for 365 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.