William Gunderson, MD
NPI 1205151990 · Internal Medicine Physician · Friday Harbor, WA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Gunderson, MD is a Internal Medicine Physician provider in Friday Harbor, WA (NPI 1205151990).
Provider details
- NPI number
- 1205151990
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 110 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 620 | 175 |
| Lisinopril | 376 | 116 |
| Tamsulosin Hcl | 272 | 85 |
| Omeprazole | 241 | 64 |
| Amlodipine Besylate | 221 | 66 |
| Metoprolol Succinate | 192 | 60 |
| Levothyroxine Sodium |
Practice location
Mailing address
Additional practice locations (1)
- 3181 Sw Sam Jackson Park RdPortland, OR 97239-3011Phone: (503) 494-8211
Registry dates
- Enumerated
- 2010-04-06
- Last updated
- 2024-07-30
- Certified
- 2024-07-30
Frequently asked questions
- What is William Gunderson's NPI number?
- William Gunderson's National Provider Identifier (NPI) is 1205151990, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Gunderson's specialty?
- William Gunderson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Gunderson located?
- William Gunderson's practice location on file with NPPES is 1117 Spring St, Friday Harbor, WA 98250-9782.
- What is William Gunderson's phone number?
- The practice phone number listed in the NPPES registry for William Gunderson is (360) 378-2141.
- Does William Gunderson accept Medicare?
- William Gunderson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Gunderson's NPI active?
- Yes — William Gunderson's NPI (1205151990) is active in the NPPES registry as of the last update on 2024-07-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.