Joseph A. Kowalczyk, MD
Internal Medicine Physician · Oak Lawn, IL
Joseph A. Kowalczyk, MD is an internal medicine physician with a practice address in Oak Lawn, Illinois, and NPI 1831166255, issued on Mar 3, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Joseph A. Kowalczyk
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 4340 W 95TH St, Oak Lawn, IL 60453
- Phone
- (708) 636-1601
- Enumerated
- Mar 3, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (708) 636-1825
- Medicare enrollment
- Enrolled (PECOS I20090415000381); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1990
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 4340 W 95TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Robert Raines, MDInternal Medicine Physician1164499596
Verify Joseph A. Kowalczyk in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7.0 times the Medicare Part D claims of the average internal medicine physician in 2024
22,201 Medicare Part D claims for 934 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 470 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,201 claims
- Amlodipine Besylate1,040 claims
- Levothyroxine Sodium921 claims
- Furosemide714 claims
- Metoprolol Succinate616 claims
- Potassium Chloride604 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: $615.71
32 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. 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.
Bills Medicare through one group practice
- Adult Primary Care Center LtdOak Lawn, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph A. Kowalczyk among 7,238 internal medicine physician records in Illinois
Joseph A. Kowalczyk, 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 fileYes · 50% of these records are
- Graduated1990 · median 2003 among the 3,580 with a school on file
- Record last updated2026 · 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).
173 internal medicine physician records list a practice address in Oak Lawn
They are 173 of the 2,993 NPPES records with a practice address in Oak Lawn, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Oak Lawn → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Chalupczak, M.D.Oak Lawn, IL 604531679505051
- Anupam Goel, MDOak Lawn, IL 604531013957570
- Vinay Kumar, MDOak Lawn, IL 604531639138217
- Eugene Muzykansky, MDOak Lawn, IL 604531457328874
- Win Myint, MDOak Lawn, IL 604531063412062
- Robert Raines, MDOak Lawn, IL 604531164499596
- Mark Reiter, M.D.Oak Lawn, IL 604531902864408
- Maria Vivian Sanchez, M.D.Oak Lawn, IL 604531912981309
Common questions
What is Joseph A. Kowalczyk, MD's NPI number?
Joseph A. Kowalczyk, MD's National Provider Identifier (NPI) is 1831166255, issued on Mar 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joseph A. Kowalczyk, MD located?
The NPPES record lists a practice address at 4340 W 95TH St, Oak Lawn, IL, 60453. Phone: (708) 636-1601. Providers update this record themselves, so call before visiting.
How can I verify Joseph A. Kowalczyk, MD's license?
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 Joseph A. Kowalczyk, MD prescribe under Medicare Part D?
In 2024, Joseph A. Kowalczyk, MD had 22,201 Medicare Part D claims for 934 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.