Doctor profile · Federal record
Dr. Irena Zalewska, MD
Gastroenterology Physician (CMS: Gastroenterology) · St Clair Shores, MI
- NPI 1407846751
- Accepts Medicare
- MIPS 75.0 / 100 · 2023
- 28 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
28963 Little Mack Ave, GI Medicine Associates PC Suite 101
St Clair Shores, MI 480813015
(586) 447-0700
fax (586) 498-0707
Credentials & registration
- NPI registered
- October 2005 — 21 yrs on file
- Profile last updated
- June 29, 2010
- Year of graduation
- 1998 — 28 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Michigan #4301072116
- Medicaid
- MI #459576110
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1407846751. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
971
Distinct HCPCS
10
Medicare allowed
$109,343
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
88305 |
Pathology examination of tissue using a microscope, intermediate complexity | 400 | 180 | $35 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 142 | 97 | $129 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 123 | 123 | $257 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 89 | 84 | $112 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 75 | 75 | $114 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 53 | 44 | $91 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 34 | 34 | $164 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 31 | 31 | $189 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 13 | 13 | $190 | |
91110 |
Imaging of digestive tract done from the inside of the digestive tract | 11 | 11 | $742 |
In context: peer comparison
Among 4 peers in this city , average services per provider: 73. This provider delivers 13× the peer median.Open Payments
Industry payments received
All-time total
$1,965
Transactions
81
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ABBVIE INC. | 23 | $524.46 | |
| Janssen Biotech, Inc. | 15 | $504.50 | |
| Takeda Pharmaceuticals U.S.A., Inc. | 11 | $173.95 | |
| Janssen Scientific Affairs, LLC | 2 | $159.66 | |
| Celgene Corporation | 9 | $142.82 | |
| Gilead Sciences, Inc. | 6 | $105.30 | |
| GENZYME CORPORATION | 3 | $67.46 | |
| PFIZER INC. | 3 | $59.56 | |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | 2 | $49.94 | |
| Regeneron Healthcare Solutions, Inc. | 2 | $41.71 | |
| Ipsen Biopharmaceuticals, Inc | 1 | $31.16 | |
| QOL Medical, LLC | 1 | $26.35 | |
| Intercept Pharmaceuticals, Inc. | 1 | $17.52 | |
| Lilly USA, LLC | 1 | $17.37 | |
| Amgen Inc. | 1 | $15.40 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
942
Patients
375
Total drug cost
$807,845
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Famotidine | Generic | 188 | 86 | $3,248 |
| Pantoprazole Sodium | Generic | 186 | 72 | $3,855 |
| Omeprazole | Generic | 117 | 50 | $3,012 |
| Sucralfate | Generic | 95 | 39 | $16,838 |
| Rabeprazole Sodium | Generic | 76 | 42 | $7,245 |
| Mesalamine | Generic | 51 | 18 | $25,981 |
| Cholestyramine (Cholestyramine (With Sugar)) | Brand | 44 | 22 | $4,885 |
| Dicyclomine Hcl | Generic | 32 | 0 | $674 |
| Gavilyte-G (Peg3350/Sod Sulf,bicarb,cl/Kcl) | Brand | 32 | 32 | $620 |
| Stelara (Ustekinumab) | Brand | 29 | 0 | $719,240 |
Hospital affiliations
Frequently asked questions
What is Dr. Irena Zalewska's medical specialty?
Dr. Irena Zalewska practices Gastroenterology Physician in St Clair Shores, MI.
Where does Dr. Irena Zalewska practice?
Dr. Irena Zalewska practices at 28963 Little Mack Ave, St Clair Shores, MI 480813015. Office phone: 5864470700.
What is Dr. Irena Zalewska's NPI?
Dr. Irena Zalewska's National Provider Identifier (NPI) is 1407846751, issued by NPPES.
Does Dr. Irena Zalewska accept Medicare assignment?
Yes. Dr. Irena Zalewska accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Irena Zalewska commonly perform?
Top Medicare-reported procedures in 2023: Pathology examination of tissue using a microscope, intermediate complexity (HCPCS 88305); Established patient office or other outpatient visit (HCPCS 99214); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385). Source: CMS Medicare Physician & Other Practitioners file.