BENJAMIN SIEMANOWSKI (M.D.) – Gastroenterology Physician, NPI 1548301120
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
474 GASTROENTEROLOGY in WA
Provider Addresses for BENJAMIN SIEMANOWSKI (M.D.)
2979 SQUALICUM PKWY STE 301
BELLINGHAM, WA 982251813
Phone: (360) 734-1420
Fax: (360) 733-1659
Type: Mailing
2979 SQUALICUM PKWY
SUITE 301
BELLINGHAM, WA 982251811
Phone: (360) 734-1420
Fax: (360) 733-1659
Type: Location
3111 WOBURN ST STE 201
BELLINGHAM, WA 982266610
Phone: (360) 734-1420
Fax: (360) 733-1659
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
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Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2007-05-25
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20070525000302 | I | Gastroenterology | WA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 414 | 222 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 184 | 183 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 131 | 105 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 61 | 59 | $0 |
| 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 | $0 |
Insurance plans in this area (ZIP 98225)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | WA | 45378 | Diagnostic examination of large bowel using an endoscope | 13 | 11 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | WA | |
| - | WA | |
| G A S T R O E N T E R O L O G Y | WA | |
| Physician Assistant | WA | |
| Internal Medicine, Gastroenterology | WA | |
| G A S T R O E N T E R O L O G Y | WA | |
| G A S T R O E N T E R O L O G Y | CT | |
| Gastroenterology, Internal Medicine | WI | |
| Physician Assistant | WA | |
| - | WA |
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