Tamer Atassi, M.D.
Gastroenterology Physician · Joliet, IL
Tamer Atassi, M.D. is a gastroenterology physician with a practice address in Joliet, Illinois, and NPI 1548276819, issued on Jul 31, 2006. Check the license (Illinois 036113533, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Tamer Atassi
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 036113533 IL
Self-reported in NPPES; status is on the state search - Practice location
- 2121 Oneida St, Joliet, IL 60435
- Phone
- (630) 685-2877
- Enumerated
- Jul 31, 2006
- Record last updated
- Oct 2, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (630) 395-9796
- Medicaid ID
- 036113533 IL
- Medicare enrollment
- Enrolled (PECOS I20060301000729); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 887 in Illinois → Look up another NPI →
Also registered at 2121 Oneida St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Diane Barnes, MS RD CSRRegistered Dietitian1346361045
- Bhuvan Chawla, M.D.Nephrology Physician1275660169
- Alma Figueroa, MSW LCSWClinical Social Worker1467753301
- Nancy Friedman, PTPhysical Therapist1912077447
- Nancy Griparis, RD. LDN.Registered Dietitian1609099746
- David McInnis, ATC, LATAthletic Trainer1902947245
Verify Tamer Atassi 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 036113533Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% fewer Medicare Part D claims than the average gastroenterology physician in 2024
497 Medicare Part D claims for 146 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 33% of claims.
Most prescribed
- Pantoprazole Sodium92 claims
- Omeprazole91 claims
- Linzess40 claims
- Rezdiffra37 claims
- Dicyclomine Hcl26 claims
- Balsalazide Disodium17 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.
Industry payments in 2024: $972.96
29 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. 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
- GI Partners OF Illinois LLCOak Lawn, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tamer Atassi among 887 gastroenterology physician records in Illinois
Tamer Atassi, 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
- Graduated1993 · median 2003 among the 643 with a school on file
- Record last updated2012 · 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 Joliet → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Suresh Bhalla, MDJoliet, IL 604351811995426
- Bachar Hamad, M.D.Joliet, IL 604351780690040
- Basant Jhawar, M.D.Joliet, IL 604351205878048
- Faizan Khan, DOJoliet, IL 604351194022541
- Riten Sheth, M.D.Joliet, IL 604351578664728
- Gerard Cerniak, M.D.Joliet, IL 604311003587049
- Darren Ballard, M.D.Homewood, IL 604301467652560
- Sameer Barkatullah, M.D.Bolingbrook, IL 604401245426980
Common questions
What is Tamer Atassi, M.D.'s NPI number?
Tamer Atassi, M.D.'s National Provider Identifier (NPI) is 1548276819, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Tamer Atassi, M.D. located?
The NPPES record lists a practice address at 2121 Oneida St, Joliet, IL, 60435. Phone: (630) 685-2877. Providers update this record themselves, so call before visiting.
How can I verify Tamer Atassi, M.D.'s license?
NPPES lists Illinois license number 036113533, 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 Tamer Atassi, M.D. prescribe under Medicare Part D?
In 2024, Tamer Atassi, M.D. had 497 Medicare Part D claims for 146 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.