Michael James Brennan, DO, MPH
Critical Care Medicine (Internal Medicine) Physician · Chicago, IL
Michael James Brennan, DO, MPH is a critical care medicine (internal medicine) physician with a practice address in Chicago, Illinois, and NPI 1811550981, issued on Apr 15, 2019. Check the license (Illinois 036.164300, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Michael James Brennan
- Credential
- DO, MPH
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License numbers
- 036.164300 IL
5101025918 MI
5151013942 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1620 W Harrison St, Chicago, IL 60612
- Phone
- (312) 942-5000
- Enumerated
- Apr 15, 2019
- Record last updated
- Sep 24, 2025
- Medicare enrollment
- Enrolled (PECOS I20230714002748); accepts Medicare assignment
- Medical or professional school
- Lake Erie Col Of Osteopathic Medicine, Bradenton, 2019
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 281 in Illinois → Look up another NPI →
Also registered at 1620 W Harrison St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Michael James Brennan 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 036.164300Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024
51 Medicare Part D claims for 38 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D.
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: $51.66
2 payments; by number, the most common kind was food and beverage; the largest payer was TerSera Therapeutics LLC. The 2,708 providers of this specialty with any payment received $2,958.68 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 4 group practices
- Advocate Health And Hospitals CorporationOak Lawn, IL
- Cedar Falls Emergency Physicians, LLCCedar Falls, IA
- Riverside Emergency Physicians LLCKankakee, IL
- Rush Oak Park ER Physicians GroupOak Park, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael James Brennan among 281 critical care medicine (internal medicine) physician records in Illinois
Michael James Brennan, DO, MPH is one of 281 critical care medicine (internal medicine) physician records with a practice address in Illinois. 92% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 86% of them.
- NPI issued2019 · 86% of these records are older, 7% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileYes · 80% of these records are
- Graduated2019 · median 2008 among the 226 with a school on file
- Record last updated2025 · 22% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in Illinois
There are 281 critical care medicine (internal medicine) physician records in Illinois.
All 281 in Illinois → Every provider in Chicago → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Foster Adams, D.O.Chicago, IL 606121376938977
- Cristina Bardita, MD, PHDChicago, IL 606121861809295
- William Chamberlin, MDChicago, IL 606121194820514
- Sydney Hyder, M.D.Chicago, IL 606121033645478
- Min Joo, MDChicago, IL 606121699722777
- Vassyl Lonchyna, MDChicago, IL 606121144412677
- Melvin Lopata, M.D.Chicago, IL 606121932142528
- Shubha Mathur, DOChicago, IL 606121922568377
Common questions
What is Michael James Brennan, DO, MPH's NPI number?
Michael James Brennan, DO, MPH's National Provider Identifier (NPI) is 1811550981, issued on Apr 15, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Michael James Brennan, DO, MPH located?
The NPPES record lists a practice address at 1620 W Harrison St, Chicago, IL, 60612. Phone: (312) 942-5000. Providers update this record themselves, so call before visiting.
How can I verify Michael James Brennan, DO, MPH's license?
NPPES lists Illinois license number 036.164300, 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 Michael James Brennan, DO, MPH prescribe under Medicare Part D?
In 2024, Michael James Brennan, DO, MPH had 51 Medicare Part D claims for 38 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.