Constantine Wonais, MD
Internal Medicine Physician · Naperville, IL
Constantine Wonais, MD is an internal medicine physician with a practice address in Naperville, Illinois, and NPI 1457340267, issued on Oct 14, 2005. Check the license (Illinois 036062093, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Constantine Wonais
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036062093 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2255 Monarch Dr, Naperville, IL 60563
- Phone
- (630) 300-1125
- Enumerated
- Oct 14, 2005
- Record last updated
- Feb 4, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (630) 300-1394
- Medicaid ID
- 036062093 2 IL
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 2255 Monarch Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Constantine Wonais in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036062093Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average internal medicine physician in 2024
413 Medicare Part D claims for 84 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Levothyroxine Sodium35 claims
- Metoprolol Succinate35 claims
- Atorvastatin Calcium32 claims
- Amlodipine Besylate23 claims
- Donepezil Hcl23 claims
- Losartan Potassium15 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.
The MIPS final score for 2023 (Medicare payment program): 91.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Constantine Wonais among 7,238 internal medicine physician records in Illinois
Constantine Wonais, MD is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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, 93% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2021 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
75 internal medicine physician records list a practice address in Naperville
They are 75 of the 4,634 NPPES records with a practice address in Naperville, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Naperville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rohini Bhat, MDNaperville, IL 605631700988706
- Mary Dea, DONaperville, IL 605631518951474
- Barbara Emery-Stolzer, MDNaperville, IL 605631982698841
- Peter Furey, M.D.Naperville, IL 605631609859289
- Cicily Jones, MDNaperville, IL 605631255396511
- Mary King, MDNaperville, IL 605631649246729
- Francine Long, MDNaperville, IL 605631063406924
- William Mollohan, D.O.Naperville, IL 605631720006919
Common questions
What is Constantine Wonais, MD's NPI number?
Constantine Wonais, MD's National Provider Identifier (NPI) is 1457340267, issued on Oct 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Constantine Wonais, MD located?
The NPPES record lists a practice address at 2255 Monarch Dr, Naperville, IL, 60563. Phone: (630) 300-1125. Providers update this record themselves, so call before visiting.
How can I verify Constantine Wonais, MD's license?
NPPES lists Illinois license number 036062093, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Constantine Wonais, MD prescribe under Medicare Part D?
In 2024, Constantine Wonais, MD had 413 Medicare Part D claims for 84 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Constantine Wonais, MD's MIPS final score?
The 2023 MIPS final score is 91.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.