Ronald Slonek, MD
Internal Medicine Physician · Bloomingdale, IL
Ronald Slonek, MD is an internal medicine physician with a practice address in Bloomingdale, Illinois, and NPI 1003884610, issued on Mar 9, 2006. Check the license (Illinois 036067364, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Ronald Slonek
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036067364 IL
Self-reported in NPPES; status is on the state search - Practice location
- 220 Springfield Dr Ste 210, Bloomingdale, IL 60108
- Phone
- (630) 858-3200
- Enumerated
- Mar 9, 2006
- Record last updated
- Aug 31, 2023
- Medicaid ID
- 036067364 IL
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 220 Springfield Dr Ste 210
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dwayne Buchanan, M.D.Family Medicine Physician1841437936
- Megan Farris, RDN, LDNRegistered Dietitian1134889447
- Khushabu Gandhi, NP-CNurse Practitioner1497318950
- Robert Hurst, MDInternal Medicine Physician1972579142
- Leslie Mattson, M.D.Internal Medicine Physician1487975181
- Roshan PatelFamily Medicine Physician1801392717
Verify Ronald Slonek 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 036067364Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
43% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,824 Medicare Part D claims for 491 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Atorvastatin Calcium244 claims
- Amlodipine Besylate214 claims
- Hydrochlorothiazide101 claims
- Levothyroxine Sodium101 claims
- Lisinopril94 claims
- Losartan Potassium86 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 Slonek among 7,238 internal medicine physician records in Illinois
Ronald Slonek, 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2023 · 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).
16 internal medicine physician records list a practice address in Bloomingdale
They are 16 of the 638 NPPES records with a practice address in Bloomingdale, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Bloomingdale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nazneen Ahmed, MDBloomingdale, IL 601081215926621
- Vanja Cuk, MDBloomingdale, IL 601081215022074
- Robert Hurst, MDBloomingdale, IL 601081972579142
- Shazia Khan, MDBloomingdale, IL 601081205869120
- Mandeep Kohli, D.OBloomingdale, IL 601081447286497
- Gerald Maida, MDBloomingdale, IL 601081891762738
- Sunil Matiwala, M.D.Bloomingdale, IL 601081174555601
- Leslie Mattson, M.D.Bloomingdale, IL 601081487975181
Common questions
What is Ronald Slonek, MD's NPI number?
Ronald Slonek, MD's National Provider Identifier (NPI) is 1003884610, issued on Mar 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Slonek, MD located?
The NPPES record lists a practice address at 220 Springfield Dr Ste 210, Bloomingdale, IL, 60108. Phone: (630) 858-3200. Providers update this record themselves, so call before visiting.
How can I verify Ronald Slonek, MD's license?
NPPES lists Illinois license number 036067364, 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 Ronald Slonek, MD prescribe under Medicare Part D?
In 2024, Ronald Slonek, MD had 1,824 Medicare Part D claims for 491 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.