DR. ROSS MICHAEL ONDERSMA (MD) – Nuclear Medicine Physician, NPI 1841403110
Nuclear Medicine Physician
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NPPES metrics only — not quality of care.
1,262 DIAGNOSTIC RADIOLOGY in WA
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Provider Addresses for DR. ROSS MICHAEL ONDERSMA (MD)
33rd Avenue West, Lynnwood, Snohomish County, Washington, 98037, United States
LYNNWOOD, WA 980364748
Phone: (425) 563-1500
Fax: (425) 563-1501
Type: Mailing
939 Caroline St
Port Angeles, WA 983623909
Phone: (360) 417-7735
Fax: (360) 565-9074
Type: Location
203 S Western Ave
Tonasket, WA 988558803
Phone: (509) 486-2151
Fax: (509) 223-1640
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: 2025-05-22
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 3 Medicare enrollment records; no due dates published yet.
Enrollment records
3
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 |
|---|---|---|---|---|
| I20121114000090 | I | Diagnostic Radiology | WA | TBD |
| I20250522001198 | I | Diagnostic Radiology | MI | TBD |
| I20250522001275 | I | Diagnostic Radiology | CA | 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 |
|---|---|---|---|---|
| 78815 | Nuclear medicine study from skull base to mid-thigh with ct scan | 943 | 883 | $0 |
| 78306 | Nuclear medicine study of bone and/or joint whole body | 303 | 277 | $0 |
| 71045 | X-ray of chest, 1 view | 243 | 234 | $0 |
| 74177 | Ct scan of abdomen and pelvis with contrast | 124 | 121 | $0 |
| 78816 | Nuclear medicine study whole body with ct scan | 111 | 107 | $0 |
Insurance plans in this area (ZIP 98036)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| DIAGNOSTIC RADIOLOGY | WA | 71250 | CT scan chest | 83 | 83 |
| DIAGNOSTIC RADIOLOGY | WA | 73562 | X-ray of knee, 3 views | 17 | 14 |
| DIAGNOSTIC RADIOLOGY | WA | 74177 | CT scan of abdomen and pelvis with contrast | 31 | 22 |
| DIAGNOSTIC RADIOLOGY | WA | 78452 | Nuclear medicine study of vessels of heart using drugs or exercise multiple studies | 93 | 91 |
| DIAGNOSTIC RADIOLOGY | WA | 78815 | Nuclear medicine study with CT imaging skull base to mid-thigh | 319 | 257 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Diagnostic Radiology | WA | |
| - | WA | |
| Diagnostic Radiology | WA | |
| - | WA | |
| Diagnostic Radiology | MO | |
| Diagnostic Radiology | WA | |
| Diagnostic Radiology | WA | |
| Diagnostic Radiology | OH | |
| Diagnostic Radiology | WA | |
| Diagnostic Radiology | TN |
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