Dr. Ross Michael Ondersma, MD
- Medicare services, 2024
- 2,674
- Medicare patients, 2024
- 2,325
- Hospital affiliations
- 7
- Industry payments
- $363
- Medical groups
- 20
- Practice address
- 939 Caroline St, Port Angeles, WA 98362
- Practice phone
- Call (360) 417-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ondersma's professional email, personal email and mobile number
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Dr. Ross Michael Ondersma is a diagnostic radiologist in Port Angeles, Washington
Dr. Ondersma practices at Olympic Memorial Hospital in Port Angeles, Washington, part of Olympic Medical Center.
Dr. Ondersma's NPI, 1841403110, was assigned on May 7, 2007. Dr. Ondersma holds Washington license MD60292915.
- NPI
- 1841403110NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8123279486
- NPI enumeration date
- May 7, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (360) 417-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ross Michael Ondersma practices at Olympic Memorial Hospital in Port Angeles, Washington
Dr. Ondersma's primary practice is Olympic Memorial Hospital, at 939 Caroline St, Port Angeles, WA 98362 in Clallam County. The practice phone is (360) 417-7000.
- Olympic Memorial Hospital939 Caroline St, Port Angeles, WA 98362 · Clallam CountyPhone(360) 417-7000
Source: Dmand AI Affiliation Data
Dr. Ross Michael Ondersma is affiliated with 24 sites of care and 20 medical groups
Dr. Ondersma's primary practice is Olympic Memorial Hospital in Port Angeles, Washington, part of Olympic Medical Center. Dr. Ondersma is also affiliated with Santa Clara Valley Medical Center. The medical group on file is Radia. Dmand AI also links Dr. Ondersma to 5 more hospitals, 19 medical groups, 16 group practices and clinics and 1 clinical lab, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ross Michael Ondersma's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ondersma practices, 24 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Olympic Memorial Hospital | Available with a free account |
| +23 more sites and 19 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Olympic Medical Center and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Ross Michael Ondersma is one of 819 diagnostic radiologists in Washington
Diagnostic radiology is Dr. Ondersma's primary specialty in the NPI Registry, under taxonomy code 2085R0202X. Dmand AI has Dr. Ondersma's licenses on file in 3 states: Washington, Indiana and Michigan.
Specialties and state licenses
- Diagnostic radiology, WashingtonPrimary
- Indiana license
- Michigan license
Diagnostic radiologists near Dr. Ondersma
Counts of diagnostic radiologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Ross Michael Ondersma billed Medicare for 2,674 services in 2024
CMS data shows 2,674 Medicare services from Dr. Ondersma across 32 procedure codes in 2024, for 2,325 Medicare patients. Medicare paid $534,311 for them.
Dr. Ondersma's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 2,8682024: 2,23122%
- Other services
- 2023: 552024: 427676%
- Surgery
- 2023: 292024: 1645%
- Tests and treatments
- 2023: 322024: 0100%
Where Dr. Ondersma's Medicare services took place, 2024
- In an office90134%
- In a facility1,77366%
Dr. Ondersma compared with the Washington median for diagnostic radiologists, 2024
- Dr. Ondersma
- Washington median
- Medicare services
- 2,674vs 2,43310% above
- Medicare patients
- 2,325vs 1,48457% above
Medians across 799 diagnostic radiologists in Washington with Dmand AI profiles that report each measure.
Dr. Ondersma's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Ondersma?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ondersma and other diagnostic radiologists in Washington.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ross Michael Ondersma treated 2,325 Medicare patients in 2024, average age 76
CMS counts 2,325 Medicare patients who saw Dr. Ondersma in 2024. The largest group is 65 to 74, with 913 patients. 75% of them have high blood pressure, and 69% have high cholesterol. 14% are also on Medicaid. Their average risk score is 1.84, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Ondersma's median patient age at 71, with 57% women.
Dr. Ondersma's Medicare patients by age, 2024
Dr. Ondersma's Medicare patients by sex, 2024
- Women1,22253%
- Men1,10347%
Chronic conditions among Dr. Ondersma's Medicare patients, 2024
- High blood pressure75%
- High cholesterol69%
- Arthritis45%
- Cancer43%
- Ischemic heart disease32%
- Mood disorders30%
- Chronic kidney disease29%
- Diabetes29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ondersma's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Ross Michael Ondersma takes part in Medicare
Dr. Ondersma accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Ross Michael Ondersma received $363 in industry payments from 2016 to 2017
CMS Open Payments shows 4 general payments to Dr. Ondersma from 3 drug and device companies from 2016 to 2017. Food and beverage make up the largest share, 100% of the total. Eli Lilly and Company paid the most, $230.
General payments to Dr. Ondersma by program year, 2016 to 2017
Companies that paid Dr. Ondersma the most, 2016 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Ross Michael Ondersma's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Ross Michael Ondersma
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Ross Michael Ondersma's NPI number?
Dr. Ross Michael Ondersma's NPI number is 1841403110. It was assigned on May 7, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Ross Michael Ondersma?
Dr. Ross Michael Ondersma is a diagnostic radiologist in Port Angeles, Washington. The primary specialty in the NPI Registry is Diagnostic Radiology Physician (taxonomy code 2085R0202X).
Where does Dr. Ross Michael Ondersma practice?
Dr. Ondersma practices at 939 Caroline St, Port Angeles, WA 98362. Dr. Ondersma's primary practice is Olympic Memorial Hospital in Port Angeles, Washington, part of Olympic Medical Center. Dmand AI also links Dr. Ondersma to 5 hospitals, 19 medical groups, 16 group practices and clinics and 1 clinical lab.
What is Dr. Ross Michael Ondersma's office phone number?
The practice phone on file for Dr. Ondersma is (360) 417-7000.
What is Dr. Ross Michael Ondersma's medical license number?
Dr. Ondersma holds Washington license MD60292915, one of the licenses on file in 3 states.
Which states has Dr. Ross Michael Ondersma been licensed in?
Dmand AI has state licenses on file for Dr. Ondersma in Washington, Indiana and Michigan.
Which hospitals is Dr. Ross Michael Ondersma affiliated with?
Dr. Ondersma practices at Olympic Memorial Hospital in Port Angeles, Washington. Dr. Ondersma is also affiliated with Santa Clara Valley Medical Center. Dmand AI links Dr. Ondersma to 5 more hospitals.
What medical group is Dr. Ross Michael Ondersma part of?
Dr. Ondersma is linked to Radia. Dmand AI links Dr. Ondersma to 19 more medical groups.
Does Dr. Ross Michael Ondersma accept Medicare?
Yes. CMS data shows Dr. Ondersma billed Medicare for 2,674 services in 2024, and Dr. Ondersma accepts Medicare assignment.
How many Medicare patients does Dr. Ross Michael Ondersma see?
CMS counts 2,325 Medicare patients who saw Dr. Ondersma in 2024, with an average age of 76.
Show 3 more questionsShow fewer questions
What services does Dr. Ross Michael Ondersma bill to Medicare?
In 2024, Dr. Ondersma's most billed Medicare services were nuclear medicine (78815), medical supplies or transport (A9595) and nuclear medicine (78306).
Has Dr. Ross Michael Ondersma received payments from drug or device companies?
CMS Open Payments shows $363 in general payments to Dr. Ondersma from 3 companies from 2016 to 2017. The largest total came from Eli Lilly and Company.
How long has Dr. Ross Michael Ondersma been practicing?
Dr. Ondersma graduated from medical school in 2006, 20 years ago.
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