Doctor profile · Federal record
Dr. Benjamin Siemanowski, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Bellingham, WA
- NPI 1548301120
- Accepts Medicare
- MIPS 87.2 / 100 · 2023
- 26 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3111 Woburn St Ste 201
Bellingham, WA 982266610
(360) 734-1420
fax (360) 733-1659
Credentials & registration
- NPI registered
- February 2007 — 19 yrs on file
- Profile last updated
- May 24, 2023
- Year of graduation
- 2000 — 26 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Washington #MD00047499
- Medicaid
- WA #1548301120
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1548301120. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,034
Distinct HCPCS
10
Medicare allowed
$107,718
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
88305 |
Pathology examination of tissue using a microscope, intermediate complexity | 414 | 222 | $36 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 184 | 183 | $249 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 131 | 105 | $128 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 61 | 59 | $96 | |
G0500 |
Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito | 56 | 56 | $5 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 35 | 34 | $105 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 26 | 26 | $178 | |
99204 |
New patient office or other outpatient visit, 45-59 minutes | 25 | 25 | $168 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 23 | 23 | $98 | |
43248 |
Insertion of guide wire with dilation of esophagus using a flexible endoscope | 18 | 18 | $142 |
In context: peer comparison
Among 10 peers in this city , average services per provider: 60. This provider delivers 17× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
883
Patients
408
Total drug cost
$411,259
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 276 | 76 | $4,079 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,mag Sulfates) | Brand | 197 | 195 | $15,054 |
| Pantoprazole Sodium | Generic | 74 | 19 | $1,690 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 72 | 70 | $2,009 |
| Mesalamine | Generic | 61 | 0 | $59,628 |
| Azathioprine | Generic | 34 | 0 | $1,841 |
| Humira(Cf) Pen (Adalimumab) | Brand | 31 | 0 | $317,673 |
| Lansoprazole | Generic | 27 | 0 | $1,174 |
| Famotidine | Generic | 20 | 0 | $271 |
| Plenvu (Peg3350/Sod Sul/Nacl/Kcl/Asb/C) | Brand | 19 | 19 | $2,760 |
Frequently asked questions
What is Dr. Benjamin Siemanowski's medical specialty?
Dr. Benjamin Siemanowski practices Gastroenterology Physician in Bellingham, WA.
Where does Dr. Benjamin Siemanowski practice?
Dr. Benjamin Siemanowski practices at 3111 Woburn St Ste 201, Bellingham, WA 982266610. Office phone: 3607341420.
What is Dr. Benjamin Siemanowski's NPI?
Dr. Benjamin Siemanowski's National Provider Identifier (NPI) is 1548301120, issued by NPPES.
Does Dr. Benjamin Siemanowski accept Medicare assignment?
Yes. Dr. Benjamin Siemanowski accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Benjamin Siemanowski commonly perform?
Top Medicare-reported procedures in 2023: Pathology examination of tissue using a microscope, intermediate complexity (HCPCS 88305); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.