Irena Zalewska, MD
NPI 1407846751 · Gastroenterology Physician · St Clair Shores, MI
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Irena Zalewska, MD is a Gastroenterology Physician provider in St Clair Shores, MI (NPI 1407846751).
Provider details
- NPI number
- 1407846751
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 4301072116 (MI)
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
20 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
818 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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 312 | $35 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 139 | $127 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 92 | $257 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 72 | $107 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 68 | $50 |
| Biopsy of Large Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Famotidine | 184 | 87 |
| Pantoprazole Sodium | 168 | 69 |
| Omeprazole | 124 | 56 |
| Rabeprazole Sodium | 102 | 42 |
| Sucralfate | 73 | 34 |
| Mesalamine | 44 | 14 |
| Ustekinumabbrand: Stelara | 38 | — |
| Cholestyramine (with Sugar) |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,965 across 83 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
- 2005-10-27
- Last updated
- 2010-06-29
Frequently asked questions
- What is Irena Zalewska's NPI number?
- Irena Zalewska's National Provider Identifier (NPI) is 1407846751, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Irena Zalewska's specialty?
- Irena Zalewska is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Irena Zalewska located?
- Irena Zalewska's practice location on file with NPPES is 28963 Little Mack Ave, St Clair Shores, MI 48081-3015.
- What is Irena Zalewska's phone number?
- The practice phone number listed in the NPPES registry for Irena Zalewska is (586) 447-0700.
- Does Irena Zalewska accept Medicare?
- Irena Zalewska is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Irena Zalewska's NPI active?
- Yes — Irena Zalewska's NPI (1407846751) is active in the NPPES registry as of the last update on 2010-06-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.