DR. WILLIAM B IV GUNDERSON (MD) – Internal Medicine Physician, NPI 1205151990
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,058 INTERNAL MEDICINE in WA
Provider Addresses for DR. WILLIAM B IV GUNDERSON (MD)
1117 SPRING ST
FRIDAY HARBOR, WA 982509782
Phone: (360) 378-2141
Fax: (360) 378-1785
Type: Location
3181 SW Sam Jackson Park Rd
Portland, OR 972393011
Phone: (503) 494-8211
Type: Location
Richard T. Jones Hall, 3181, Southwest Sam Jackson Park Road, Marquam Hill, Homestead, Portland, Metro, Multnomah County, Oregon, 97239, United States
PORTLAND, OR 972393011
Phone: (503) 494-8211
Type: Location
220, Northwest 49th Street, Phinney Ridge, Seattle, King County, Washington, 98107, United States
SEATTLE, WA 981073417
Phone: (503) 791-2709
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.
This can happen when there are no reportable CMS Open Payments records.
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: 2014-09-10
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 |
|---|---|---|---|---|
| I20140910002173 | I | Internal Medicine | 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 |
|---|---|---|---|---|
| 99239 | Hospital discharge day management, more than 30 minutes | 12 | 12 | $0 |
Insurance plans in this area (ZIP 98250)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | WA | |
| Family Practice | WA | |
| - | WA | |
| - | WA | |
| Orthopedic Surgery | WA | |
| - | WA | |
| Internal Medicine, Hematology/Oncology | MA | |
| - | WA | |
| - | WA | |
| Family Practice | OH |
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