Surgeon profile
John Walker, D.O.
Gastroenterology · Portland, ME 04102NPI 1851737811
Database refreshed July 2026Live NPPES registry· Industry payments CY2025ⓘ sources
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Tracked procedure volumes
Latest federal claims release with year-over-year momentum. Eight device-heavy specialties tracked — more coming.
212 Medicare cases/yr
211 patients
3 procedures
| Procedure | Cases | Trend | Patients |
|---|---|---|---|
| Colonoscopy with Polypectomy (Snare) CPT 45385 | 96 | ▲ +32% | 96 |
| Colonoscopy with Biopsy CPT 45380 | 65 | ▲ +25% | 65 |
| Upper GI Endoscopy (EGD) with Biopsy CPT 43239 | 51 | ▼ -12% | 50 |
Industry relationships
CMS Open Payments, CY2025 general payments (published June 2026) — who already pays this surgeon.
Pulling CY2025 industry payments + 7-year history…