Ofer Fass, MD
Gastroenterology Physician · Chicago, IL
Ofer Fass, MD is a gastroenterology physician with a practice address in Chicago, Illinois, and NPI 1154856714, issued on Apr 20, 2017. Check the license (Illinois 036170527, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Ofer Fass
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 036170527 IL
298903 NY
Self-reported in NPPES; status is on the state search - Practice location
- 259 E Erie St Ste 1600, Chicago, IL 60611
- Phone
- (312) 695-5620
- Enumerated
- Apr 20, 2017
- Record last updated
- Dec 17, 2024
- Fax
- (312) 695-2778
- Medicare enrollment
- Enrolled (PECOS I20240802002274); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2017
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 259 E Erie St Ste 1600
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Patricia Araujo, RDRegistered Dietitian1073961686
- Christine Boumitri, M.DGastroenterology Physician1992050702
- Harold Boutte, M.D.Gastroenterology Physician1487911038
Verify Ofer Fass 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 036170527Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average gastroenterology physician in 2024
21 Medicare Part D claims for 17 beneficiaries, against an average of 811 among the 16,445 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: $676.70
6 payments; by number, the most common kind was food and beverage; the largest payer was Salix Pharmaceuticals, a division of Bausch Health US, LLC. The 13,350 providers of this specialty with any payment received $5,015.95 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
- Northwestern Medical Faculty FoundationChicago, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ofer Fass among 887 gastroenterology physician records in Illinois
Ofer Fass, MD 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 2017, is newer than 82% of them.
- NPI issued2017 · 82% of these records are older, 14% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2017 · median 2003 among the 643 with a school on file
- Record last updated2024 · 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
- Greg Cohen, M.D.Chicago, IL 606111669447348
- Maria Ferreira, MDChicago, IL 606111194755421
- Robin Fintel, M.D.Chicago, IL 606111023083250
- Steven Flamm, MDChicago, IL 606111912937244
- Melvin Goldstein, M.D.Chicago, IL 606111376531400
- Nirmala Gonsalves, MDChicago, IL 606111326038712
- Richard Green, MDChicago, IL 606111770511404
- Joseph Karacic, MDChicago, IL 606111992798417
Common questions
What is Ofer Fass, MD's NPI number?
Ofer Fass, MD's National Provider Identifier (NPI) is 1154856714, issued on Apr 20, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Ofer Fass, MD located?
The NPPES record lists a practice address at 259 E Erie St Ste 1600, Chicago, IL, 60611. Phone: (312) 695-5620. Providers update this record themselves, so call before visiting.
How can I verify Ofer Fass, MD's license?
NPPES lists Illinois license number 036170527, 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 Ofer Fass, MD prescribe under Medicare Part D?
In 2024, Ofer Fass, MD had 21 Medicare Part D claims for 17 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.