Ronald Charles Tomas, M.D.
Internal Medicine Physician · Troy, MI
Ronald Charles Tomas, M.D. is an internal medicine physician with a practice address in Troy, Michigan, and NPI 1588720734, issued on Dec 29, 2006. Check the license (Michigan 4301035408, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Ronald Charles Tomas
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301035408 MI
Self-reported in NPPES; status is on the state search - Practice location
- 6581 Merrick Dr, Troy, MI 48098
- Phone
- (248) 879-7923
- Enumerated
- Dec 29, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Verify Ronald Charles Tomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301035408Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
23 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Lorazepam13 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.
Ronald Charles Tomas among 5,735 internal medicine physician records in Michigan
Ronald Charles Tomas, M.D. is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2007 · 54% 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 Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
117 internal medicine physician records list a practice address in Troy
They are 117 of the 3,809 NPPES records with a practice address in Troy, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Troy → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rafael Barretto, D.O.Warren, MI 480981942202122
- Michelle Biddinger, MDTroy, MI 480981326015033
- John Bonema, MDTroy, MI 480981508833708
- Mudassir Daimee, M.D.Troy, MI 480981205838307
- James Henderson, MDTroy, MI 480981104895127
- Nadarajan Janakan, M.D.Troy, MI 480981134128812
- Michael Lumberg, MDTroy, MI 480981700853447
- Tony Nguyen, M.D.Troy, MI 480981396741567
Common questions
What is Ronald Charles Tomas, M.D.'s NPI number?
Ronald Charles Tomas, M.D.'s National Provider Identifier (NPI) is 1588720734, issued on Dec 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Charles Tomas, M.D. located?
The NPPES record lists a practice address at 6581 Merrick Dr, Troy, MI, 48098. Phone: (248) 879-7923. Providers update this record themselves, so call before visiting.
How can I verify Ronald Charles Tomas, M.D.'s license?
NPPES lists Michigan license number 4301035408, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ronald Charles Tomas, M.D. prescribe under Medicare Part D?
In 2024, Ronald Charles Tomas, M.D. had 23 Medicare Part D claims; 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.