MARK EDWARD SIENKO (M.D.) – Medical Oncology Physician, NPI 1932146552
Medical Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
181 MEDICAL ONCOLOGY in WA
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Provider Addresses for MARK EDWARD SIENKO (M.D.)
PO BOX 850
PORT ANGELES, WA 983620146
Phone: (360) 683-9895
Fax: (360) 582-5614
Type: Mailing
844, North 5th Avenue, Sequim, Clallam County, Washington, 98382, United States
SEQUIM, WA 983823045
Phone: (360) 683-9895
Fax: (360) 582-5614
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 10 Open Payments records for all available years, with a total value of $649.
Total Amount is formed as General ($649) + Research ($0) + Ownership ($0) = $649.
Last reported payment date: 2024-07-29 • Largest payer in this snapshot: E.R. Squibb & Sons, L.L.C. ($288).
Total Amount
$649
General + Research + Ownership
Payments
10
Total payment records
General Amount
$649
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-07-29
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| E.R. Squibb & Sons, L.L.C. | $288 |
| AstraZeneca Pharmaceuticals LP | $221 |
| PFIZER INC. | $119 |
| Novartis Pharmaceuticals Corporation | $21 |
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: 2024-06-11
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20060628000327 | I | Medical Oncology | WA | TBD |
| I20240611003898 | I | Hematology/Oncology | CO | 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 | 1,029 | 412 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 208 | 125 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 153 | 139 | $0 |
| 99205 | New patient office or other outpatient visit, 60-74 minutes | 118 | 118 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 24 | 24 | $0 |
Insurance plans in this area (ZIP 98362)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| HEMATOLOGY/ONCOLOGY | WA | 96367 | Infusion into a vein for therapy prevention or diagnosis additional sequential infusion up to 1 hour | 679 | 116 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | WA | |
| Nurse Practitioner | WA | |
| - | IL | |
| O P H T H A L M O L O G Y | OR | |
| O P H T H A L M O L O G Y | WA | |
| Nurse Practitioner | WA | |
| Family Practice | WA | |
| Interventional Radiology, Diagnostic Radiology | OH | |
| Physician Assistant | ID | |
| Clinical Psychologist | WA |
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