Darren Kowalski, M.D.
NPI 1598859076 · Surgery Physician · Bend, OR
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Darren Kowalski, M.D. is a Surgery Physician provider in Bend, OR (NPI 1598859076).
Provider details
- NPI number
- 1598859076
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD22898 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
999 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 215 | $187 |
| Ultrasound Study of One Arm Or Leg Veins With Compression and Maneuvers93971 | 115 | $118 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 64 | $240 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 58 | $126 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 57 | $155 |
| Colorectal Cancer Screening; Colonoscopy on Individual Not Meeting Criteria for High Risk |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 30 | 29 |
| Metronidazole | 15 | 14 |
| Neomycin Sulfate | 14 | 13 |
| Oxycodone Hcl | 14 | 14 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 13 | 12 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 11 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-02
- Last updated
- 2021-04-06
- Certified
- 2021-04-06
Frequently asked questions
- What is Darren Kowalski's NPI number?
- Darren Kowalski's National Provider Identifier (NPI) is 1598859076, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Darren Kowalski's specialty?
- Darren Kowalski is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Darren Kowalski located?
- Darren Kowalski's practice location on file with NPPES is 1501 Ne Medical Center Dr, Bend, OR 97701-6051.
- What is Darren Kowalski's phone number?
- The practice phone number listed in the NPPES registry for Darren Kowalski is (541) 382-2811.
- Does Darren Kowalski accept Medicare?
- Darren Kowalski is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Darren Kowalski's NPI active?
- Yes — Darren Kowalski's NPI (1598859076) is active in the NPPES registry as of the last update on 2021-04-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.