Ratnam A. Oza, MD
Internal Medicine Physician · Dayton, OH
Ratnam A. Oza, MD is an internal medicine physician with a practice address in Dayton, Ohio, and NPI 1003816687, issued on Jul 26, 2005. Check the license (Ohio 35044276, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.
- Name
- Ratnam A. Oza
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 35044276 OH
Self-reported in NPPES; status is on the state search - Practice location
- 1100 S Main St, Dayton, OH 45409
- Phone
- (937) 222-0603
- Enumerated
- Jul 26, 2005
- Record last updated
- Feb 16, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (937) 222-7122
- Medicaid ID
- 0498304 OH
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,277 in Ohio → Look up another NPI →
Also registered at 1100 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amita Oza, MDInternal Medicine Physician1285634865
- Mojun ZhaoStudent in an Organized Health Care Education/Training Program1407306244
Verify Ratnam A. Oza in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersState Medical Board of Ohio
Search for license 35044276Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% more Medicare Part D claims than the average internal medicine physician in 2024
3,444 Medicare Part D claims for 321 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. 66 claims were for opioids.
Most prescribed
- Amlodipine Besylate178 claims
- Atorvastatin Calcium171 claims
- Omeprazole147 claims
- Metformin Hcl131 claims
- Levothyroxine Sodium124 claims
- Furosemide81 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: $46.88
2 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. 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.
Ratnam A. Oza among 5,277 internal medicine physician records in Ohio
Ratnam A. Oza, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 87% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 65% of these records are
- Record last updated2011 · 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
- Shariar Arasteh, DODayton, OH 454091578670576
- Rameswar Chaudhuri, MDDayton, OH 454091104915602
- Beth Duvall, MDOakwood, OH 454091891772216
- John Fitzharris, DODayton, OH 454091467406777
- Elie Ghazal, MDDayton, OH 454091982657391
- Liping Guan, M.D.Dayton, OH 454091932167236
- Syed Hassan, MDDayton, OH 454091104810886
- Amita Oza, MDDayton, OH 454091285634865
Common questions
What is Ratnam A. Oza, MD's NPI number?
Ratnam A. Oza, MD's National Provider Identifier (NPI) is 1003816687, issued on Jul 26, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Ratnam A. Oza, MD located?
The NPPES record lists a practice address at 1100 S Main St, Dayton, OH, 45409. Phone: (937) 222-0603. Providers update this record themselves, so call before visiting.
How can I verify Ratnam A. Oza, MD's license?
NPPES lists Ohio license number 35044276, 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 Ratnam A. Oza, MD prescribe under Medicare Part D?
In 2024, Ratnam A. Oza, MD had 3,444 Medicare Part D claims for 321 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.