DR. MARK DUNCAN (MD) – Family Medicine Physician, NPI 1598713919
Family Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,141 FAMILY PRACTICE in WA
Provider Addresses for DR. MARK DUNCAN (MD)
3145 SHADOWBROOK LN
OAK HARBOR, WA 982779031
Phone: (360) 929-4936
Type: Mailing
5577 VANBARR PL
FREELAND, WA 982499555
Phone: (360) 331-3343
Type: Location
PO BOX 935
FREELAND, WA 982490935
Phone: (360) 331-3343
Fax: (360) 331-3373
Type: Mailing
Pediatric Associates of Whidbey Island, 1690, Layton Road, Freeland, Island County, Washington, 98249, United States
FREELAND, WA 982499456
Phone: (360) 331-3343
Type: Location
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: 2013-04-23
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 |
|---|---|---|---|---|
| I20130423000330 | I | Family Practice | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 107 | 85 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 43 | 38 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 22 | 21 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 22 | 22 | $0 |
Insurance plans in this area (ZIP 98277)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | WA | |
| Physician Assistant | WA | |
| Internal Medicine | WA | |
| Physician Assistant | WA |
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