Mariusz Milejczyk, MD
Internal Medicine Physician · Libertyville, IL
Mariusz Milejczyk, MD is an internal medicine physician with a practice address in Libertyville, Illinois, and NPI 1467598235, issued on Jan 29, 2007. Check the license (Illinois 036093940, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mariusz Milejczyk
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036093940 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1880 W Winchester RD Ste 106, Libertyville, IL 60048
- Phone
- (847) 367-4277
- Enumerated
- Jan 29, 2007
- Record last updated
- Dec 27, 2024
- Fax
- (847) 810-0287
- Medicare enrollment
- Enrolled (PECOS I20070619000177); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Verify Mariusz Milejczyk 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 036093940Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% more Medicare Part D claims than the average internal medicine physician in 2024
5,841 Medicare Part D claims for 253 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 213 claims were for opioids.
Most prescribed
- Amlodipine Besylate237 claims
- Atorvastatin Calcium234 claims
- Metoprolol Tartrate181 claims
- Metformin Hcl150 claims
- Metoprolol Succinate146 claims
- Levothyroxine Sodium145 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): 58.4 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).
Industry payments in 2024: $331.56
16 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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.
Mariusz Milejczyk among 7,238 internal medicine physician records in Illinois
Mariusz Milejczyk, 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 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 55% 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 updated2024 · 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).
27 internal medicine physician records list a practice address in Libertyville
They are 27 of the 1,361 NPPES records with a practice address in Libertyville, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Libertyville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mark Chyna, M.D.Libertyville, IL 600481740273507
- Mohina Gupta, MDLibertyville, IL 600481174578843
- Michael Hall, M.D.Libertyville, IL 600481528053972
- Syeda Iftikhar, M.D.Libertyville, IL 600481770599938
- Allison Klotzbuecher, D.O.Libertyville, IL 600481437170552
- Elliot Miller, MDLibertyville, IL 600481164441572
- Melissa Reeves, MDLibertyville, IL 600481942212311
- Mark Riederman, M.D.Libertyville, IL 600481699782151
Common questions
What is Mariusz Milejczyk, MD's NPI number?
Mariusz Milejczyk, MD's National Provider Identifier (NPI) is 1467598235, issued on Jan 29, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mariusz Milejczyk, MD located?
The NPPES record lists a practice address at 1880 W Winchester RD Ste 106, Libertyville, IL, 60048. Phone: (847) 367-4277. Providers update this record themselves, so call before visiting.
How can I verify Mariusz Milejczyk, MD's license?
NPPES lists Illinois license number 036093940, 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 Mariusz Milejczyk, MD prescribe under Medicare Part D?
In 2024, Mariusz Milejczyk, MD had 5,841 Medicare Part D claims for 253 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mariusz Milejczyk, MD's MIPS final score?
The 2023 MIPS final score is 58.4 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.