Charles Osborne Duncan, DO
Internal Medicine Physician · Dayton, OH
Charles Osborne Duncan, DO is an internal medicine physician with a practice address in Dayton, Ohio, and NPI 1033413547, issued on Dec 28, 2010. Check the license (Ohio 58.003696, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Charles Osborne Duncan
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 58.003696 OH
36197 NC
Self-reported in NPPES; status is on the state search - Practice location
- 405 W Grand Ave, Dayton, OH 45405
- Phone
- (937) 723-3248
- Enumerated
- Dec 28, 2010
- Record last updated
- Mar 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140312001908); accepts Medicare assignment
- Medical or professional school
- University Of Pikeville, Kentucky College Of Osteopathic Med, 2010
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,277 in Ohio → Look up another NPI →
Also registered at 405 W Grand Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Charles Osborne Duncan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 58.003696Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average internal medicine physician in 2024
362 Medicare Part D claims for 102 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 13 claims were for opioids.
Most prescribed
- Amoxicillin-Clavulanate Potass22 claims
- Amiodarone Hcl19 claims
- Atorvastatin Calcium18 claims
- Doxycycline Hyclate18 claims
- Metoprolol Succinate15 claims
- Pantoprazole Sodium15 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 2 group practices
- Georgetown Memorial HospitalGeorgetown, SC
- Waccamaw Community HospitalMurrells Inlet, SC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Charles Osborne Duncan among 5,277 internal medicine physician records in Ohio
Charles Osborne Duncan, 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 2010, is newer than 58% of them.
- NPI issued2010 · 58% of these records are older, 40% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated2010 · median 2006 among the 3,414 with a school on file
- Record last updated2021 · 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).
225 internal medicine physician records list a practice address in Dayton
They are 225 of the 12,431 NPPES records with a practice address in Dayton, and 5,277 internal medicine physician records in Ohio.
All 5,277 in Ohio → Every provider in Dayton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ammar Ahmad, MDDayton, OH 454051366905390
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- Barbara Akoto, M.D.Dayton, OH 454051992707913
- Ali Jaffery, M.D.Dayton, OH 454051649489105
- Sunita Mall, MDDayton, OH 454051962455634
- Mary Mullen, M.D.Dayton, OH 454051780079186
- Stephen Noftz, DODayton, OH 454051275113995
- Dipendra Sharma Chapagain, DODayton, OH 454051104314467
Common questions
What is Charles Osborne Duncan, DO's NPI number?
Charles Osborne Duncan, DO's National Provider Identifier (NPI) is 1033413547, issued on Dec 28, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Charles Osborne Duncan, DO located?
The NPPES record lists a practice address at 405 W Grand Ave, Dayton, OH, 45405. Phone: (937) 723-3248. Providers update this record themselves, so call before visiting.
How can I verify Charles Osborne Duncan, DO's license?
NPPES lists Ohio license number 58.003696, 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 Charles Osborne Duncan, DO prescribe under Medicare Part D?
In 2024, Charles Osborne Duncan, DO had 362 Medicare Part D claims for 102 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.