Ross Ondersma, MD
NPI 1841403110 · Diagnostic Radiology Physician · Lynnwood, WA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ross Ondersma, MD is a Diagnostic Radiology Physician provider in Lynnwood, WA (NPI 1841403110).
Provider details
- NPI number
- 1841403110
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 01066258A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
2,674 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Nuclear Medicine Study From Skull Base to Mid-Thigh With Ct Scan78815 | 451 | $114 |
| Nuclear Medicine Study From Skull Base to Mid-Thigh With Ct Scan78815 | 348 | $743 |
| Piflufolastat F-18, Diagnostic, 1 MillicurieA9595 | 310 | $636 |
| Nuclear Medicine Study of Bone And/Or Joint Whole Body78306 | 183 | $40 |
| X-Ray of Chest, 1 View71045 | 182 | $9 |
| Fluorodeoxyglucose F-18 Fdg, Diagnostic, Per Study Dose, Up to 45 MillicuriesA9552 | 117 | $353 |
Practice location
Mailing address
Additional practice locations (2)
- 939 Caroline StPort Angeles, WA 98362-3909Phone: (360) 417-7735Fax: (360) 565-9074
- 203 S Western AveTonasket, WA 98855-8803Phone: (509) 486-2151Fax: (509) 223-1640
Registry dates
- Enumerated
- 2007-05-07
- Last updated
- 2026-02-23
- Certified
- 2026-02-23
Frequently asked questions
- What is Ross Ondersma's NPI number?
- Ross Ondersma's National Provider Identifier (NPI) is 1841403110, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ross Ondersma's specialty?
- Ross Ondersma is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Ross Ondersma located?
- Ross Ondersma's practice location on file with NPPES is 19020 33rd Ave W Ste 210, Lynnwood, WA 98036-4748.
- What is Ross Ondersma's phone number?
- The practice phone number listed in the NPPES registry for Ross Ondersma is (425) 563-1500.
- Does Ross Ondersma accept Medicare?
- Ross Ondersma is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ross Ondersma's NPI active?
- Yes — Ross Ondersma's NPI (1841403110) is active in the NPPES registry as of the last update on 2026-02-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.