Robert Parker Guinsler, DO
Internal Medicine Physician · Newark, OH
Robert Parker Guinsler, DO is an internal medicine physician with a practice address in Newark, Ohio, and NPI 1720541253, issued on Apr 11, 2019. Check the license (Ohio 34.014854, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Robert Parker Guinsler
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 34.014854 OH
Self-reported in NPPES; status is on the state search - Practice location
- 1717 W Main St Ste 200, Newark, OH 43055
- Phone
- (220) 564-1700
- Enumerated
- Apr 11, 2019
- Record last updated
- Jan 13, 2025
- Fax
- (220) 564-1701
- Medicare enrollment
- Enrolled (PECOS I20221208001567); accepts Medicare assignment
- Medical or professional school
- Ohio University, College Of Osteopathic Medicine, 2019
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,277 in Ohio → Look up another NPI →
Verify Robert Parker Guinsler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 34.014854Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average internal medicine physician in 2024
7,302 Medicare Part D claims for 679 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 229 claims were for opioids.
Most prescribed
- Atorvastatin Calcium223 claims
- Amlodipine Besylate215 claims
- Rosuvastatin Calcium182 claims
- Quetiapine Fumarate181 claims
- Pantoprazole Sodium174 claims
- Sertraline Hcl168 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.
Industry payments in 2024: $266.37
3 payments; by number, the most common kind was food and beverage; the largest payer was Bayer Healthcare Pharmaceuticals Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Licking Memorial Health ProfessionalsNewark, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Parker Guinsler among 5,277 internal medicine physician records in Ohio
Robert Parker Guinsler, DO 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 2019, is newer than 81% of them.
- NPI issued2019 · 81% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2019 · 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 Newark → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nabil Bourjeily, MDNewark, OH 430551740239110
- Gerald Ehrsam, MDNewark, OH 430551740289941
- Raju Fatehchand, MD FACPNewark, OH 430551346201407
- Daria Hopkins, MDNewark, OH 430551174782775
- Robert KampsNewark, OH 430551144521618
- David Koontz, DONewark, OH 430551730193137
- Maria May, D.O.Newark, OH 430551093256216
- Mark Mitchell, MDNewark, OH 430551023017860
Common questions
What is Robert Parker Guinsler, DO's NPI number?
Robert Parker Guinsler, DO's National Provider Identifier (NPI) is 1720541253, issued on Apr 11, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Robert Parker Guinsler, DO located?
The NPPES record lists a practice address at 1717 W Main St Ste 200, Newark, OH, 43055. Phone: (220) 564-1700. Providers update this record themselves, so call before visiting.
How can I verify Robert Parker Guinsler, DO's license?
NPPES lists Ohio license number 34.014854, 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 Robert Parker Guinsler, DO prescribe under Medicare Part D?
In 2024, Robert Parker Guinsler, DO had 7,302 Medicare Part D claims for 679 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.