Tamer Atassi, M.D.
NPI 1548276819 · Gastroenterology Physician · Joliet, IL
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tamer Atassi, M.D. is a Gastroenterology Physician provider in Joliet, IL (NPI 1548276819).
Provider details
- NPI number
- 1548276819
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 036113533 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,681 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 372 | $80 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 240 | $116 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 182 | $173 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 158 | $130 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 129 | $97 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 92 | 32 |
| Omeprazole | 91 | 30 |
| Linaclotidebrand: Linzess | 40 | — |
| Resmetirombrand: Rezdiffra | 37 | — |
| Dicyclomine Hcl | 26 | — |
| Lubiprostone | 17 | — |
| Balsalazide Disodium | 17 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$973 across 29 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-31
- Last updated
- 2012-10-02
Frequently asked questions
- What is Tamer Atassi's NPI number?
- Tamer Atassi's National Provider Identifier (NPI) is 1548276819, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tamer Atassi's specialty?
- Tamer Atassi is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Tamer Atassi located?
- Tamer Atassi's practice location on file with NPPES is 2121 Oneida St, Joliet, IL 60435-6544.
- What is Tamer Atassi's phone number?
- The practice phone number listed in the NPPES registry for Tamer Atassi is (630) 685-2877.
- Does Tamer Atassi accept Medicare?
- Tamer Atassi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tamer Atassi's NPI active?
- Yes — Tamer Atassi's NPI (1548276819) is active in the NPPES registry as of the last update on 2012-10-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.