Mark Demeo, M.D.
Gastroenterology Physician · Chicago, IL
Mark Demeo, M.D. is a gastroenterology physician with a practice address in Chicago, Illinois, and NPI 1972549327, issued on Jun 22, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Mark Demeo
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- Practice location
- 1725 W Harrison St, Chicago, IL 60612
- Phone
- (312) 942-5861
- Enumerated
- Jun 22, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20040412000924); accepts Medicare assignment
- Medical or professional school
- Rutgers New Jersey Medical School, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 1725 W Harrison St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Qurrat-Ul-Ain Abid, MDHospice and Palliative Medicine (Internal Medicine) Physician1053949024
- John Acheson, MDSurgery Physician1205528726
- David Agbunag, PA-CSurgical Physician Assistant1093885188
- Eda Akyar, MDSports Medicine (Family Medicine) Physician1255910006
- Jorelle Alexander, DMD,MPHDentist1972790756
- Amjad Ali, M.D.Specialist1952359184
Verify Mark Demeo 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
23% more Medicare Part D claims than the average gastroenterology physician in 2024
1,000 Medicare Part D claims for 308 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims.
Most prescribed
- Linzess113 claims
- Famotidine85 claims
- Creon83 claims
- Misoprostol77 claims
- Gavilyte-G73 claims
- Sod Sulf-Potass Sulf-Mag Sulf71 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
- Rush University Medical GroupChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Demeo among 887 gastroenterology physician records in Illinois
Mark Demeo, M.D. is one of 887 gastroenterology physician records with a practice address in Illinois. 85% 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 15% of them.
- NPI issued2006 · 15% of these records are older, 52% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1983 · median 2003 among the 643 with a school on file
- Record last updated2007 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Illinois
There are 887 gastroenterology physician records in Illinois.
All 887 in Illinois → Every provider in Chicago → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Frida Abrahamian, MDChicago, IL 606121447274279
- Purnima Balachandran, MDChicago, IL 606121659318509
- Michael Brown, M.D.Chicago, IL 606121265477293
- Keith Bruninga, M.D.Chicago, IL 606121881638823
- Mohammad Fayyaz, MDChicago, IL 606121992731616
- Benjamin Go, M.D.Chicago, IL 606121982624946
- Ali Keshavarzian, M.D.Chicago, IL 606121558302257
- Srinadh Komanduri, M.D.Chicago, IL 606121952342339
Common questions
What is Mark Demeo, M.D.'s NPI number?
Mark Demeo, M.D.'s National Provider Identifier (NPI) is 1972549327, issued on Jun 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Demeo, M.D. located?
The NPPES record lists a practice address at 1725 W Harrison St, Chicago, IL, 60612. Phone: (312) 942-5861. Providers update this record themselves, so call before visiting.
How can I verify Mark Demeo, M.D.'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 Mark Demeo, M.D. prescribe under Medicare Part D?
In 2024, Mark Demeo, M.D. had 1,000 Medicare Part D claims for 308 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.