Marek Krysztofiak
Internal Medicine Physician · Chicago, IL
Marek Krysztofiak is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1174774426, issued on Oct 6, 2008. Check the license (Illinois 125.045416, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Marek Krysztofiak
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 125.045416 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2525 S Michigan Ave, Chicago, IL 60616
- Phone
- (312) 567-2000
- Enumerated
- Oct 6, 2008
- Record last updated
- Oct 6, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120809000900); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 2525 S Michigan Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marek Krysztofiak 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 125.045416Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
267 Medicare Part D claims for 121 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 29 claims were for opioids.
Most prescribed
- Oxycodone Hcl23 claims
- Albuterol Sulfate Hfa12 claims
- Cephalexin11 claims
- Metoprolol Succinate11 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.
Bills Medicare through one group practice
- Hospital Medicine Services OF FL, LLCHudson, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marek Krysztofiak among 7,238 internal medicine physician records in Illinois
Marek Krysztofiak 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 2008, is newer than 45% of them.
- NPI issued2008 · 45% of these records are older, 51% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2002 · median 2003 among the 3,580 with a school on file
- Record last updated2008 · 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).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Azmina Bhaiji, M.D.Chicago, IL 606161487689634
- Edward Bleier, MDChicago, IL 606161649256744
- Danny Choy, D.OChicago, IL 606161376526954
- Linus Ema, DOChicago, IL 606161891728010
- Juhyun Ha, M.D.Chicago, IL 606161811913395
Common questions
What is Marek Krysztofiak's NPI number?
Marek Krysztofiak's National Provider Identifier (NPI) is 1174774426, issued on Oct 6, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Marek Krysztofiak located?
The NPPES record lists a practice address at 2525 S Michigan Ave, Chicago, IL, 60616. Phone: (312) 567-2000. Providers update this record themselves, so call before visiting.
How can I verify Marek Krysztofiak's license?
NPPES lists Illinois license number 125.045416, 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 Marek Krysztofiak prescribe under Medicare Part D?
In 2024, Marek Krysztofiak had 267 Medicare Part D claims for 121 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.