Ross Michael Ondersma, MD

Primary specialty

Diagnostic Radiology PhysicianTaxonomy code 2085R0202X

License

MD60292915 Issued in WA

Practice address

19020 33Rd Ave W Ste 210
Lynnwood, WA 98036-4748

Phone

(425) 563-1500

Fax

(425) 563-1501

NPI assigned

May 7, 2007

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 4

Addresses

Other identifiers 1

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in WA, MI, CA3 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 3

Specialty

Diagnostic Radiology

Education

Other, 2006

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Radiology Associates PAGroup PAC ID 7517953912, 103 clinicians

Radia Inc P SGroup PAC ID 9931012812, 275 clinicians

South Sound Radiologists Inc P SGroup PAC ID 1254229305, 76 clinicians

Medford Radiological Group PCGroup PAC ID 2062303324, 91 clinicians

Radia Oregon Radiology Medical Group LLCGroup PAC ID 2961852637, 122 clinicians

Radia California Radiology Medical Group IncGroup PAC ID 8921465998, 134 clinicians

Evergreen Radia LLCGroup PAC ID 4587568076, 116 clinicians

Central Washington Health Services AssociationGroup PAC ID 4880504596, 708 clinicians

Swedish Health ServicesGroup PAC ID 3173433067, 156 clinicians

County of Santa ClaraGroup PAC ID 1254244973, 1,000 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Providence Santa Rosa Memorial Hospital Hospital, Santa Rosa, CA, CCN 050174
• Olympic Medical Center Hospital, Port Angeles, WA, CCN 500072
• Swedish Medical Center Hospital, Seattle, WA, CCN 500027
• Swedish Edmonds Hospital Hospital, Edmonds, WA, CCN 500026
• Swedish Issaquah Hospital, Issaquah, WA, CCN 500152

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations (25 of 51)

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Central Washington Health Services Association

  dba Confluence Health

  • Emergency Medical Services (Emergency Medicine) Physician
  • Wenatchee, WA
  • NPI 1801937453
  Medicare reassignment Care Compare group NPD
• Evergreen Radia LLC

  dba Evergreen Radia

  • Diagnostic Radiology Physician
  • Kirkland, WA
  • NPI 1922095694
  Medicare reassignment Care Compare group NPD
• Radia Inc P S

  dba Radia

  • Diagnostic Radiology Physician
  • Lynnwood, WA
  • NPI 1932196607
  Medicare reassignment Care Compare group NPD
• South Sound Radiologists Inc P S

  dba South Sound Radiology

  • Diagnostic Radiology Physician
  • Olympia, WA
  • NPI 1902990500
  Medicare reassignment Care Compare group NPD
• Swedish Health Services

  dba Swedish Imaging Clinics

  • Body Imaging Physician
  • Everett, WA
  • NPI 1114356904
  Medicare reassignment Care Compare group NPD
• County of Santa Clara

  dba Josefina Narvaez Mental Health Center MH Aoa

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • San Jose, CA
  • NPI 1699885079
  Medicare reassignment Care Compare group NPD
• Medford Radiological Group, PC

  • Diagnostic Radiology Physician
  • Medford, OR
  • NPI 1407938111

  WA

  Medicare reassignment Care Compare group NPD
• Radia California Radiology Medical Group Inc

  dba Radia California

  • Diagnostic Radiology Physician
  • Santa Rosa, CA
  • NPI 1740982032

  WA

  Medicare reassignment Care Compare group NPD
• Radia Oregon Radiology Medical Group LLC

  dba Radia Oregon

  • Diagnostic Radiology Physician
  • Medford, OR
  • NPI 1073385423

  WA

  Medicare reassignment Care Compare group NPD
• Radiology Associates PA

  • Diagnostic Radiology Physician
  • Little Rock, AR
  • NPI 1366438186

  WA

  Medicare reassignment Care Compare group NPD
• Obstetrix Medical Group of Washington Inc PS

  • Maternal & Fetal Medicine Physician
  • Seattle, WA
  • NPI 1861599573
  Medicare reassignment NPD
• Okanogan County Public Hospital Dist No 4

  • Critical Access Hospital
  • Tonasket, WA
  • NPI 1164580700
  Medicare reassignment NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Clallam County Public Hospital District 2

  dba Olympic Medical Center

  • General Acute Care Hospital
  • Port Angeles, WA
  • NPI 1306845557
  Care Compare affiliation
• Swedish Edmonds

  • General Acute Care Hospital
  • Edmonds, WA
  • NPI 1033107214
  Care Compare affiliation
• Swedish Edmonds

  • Clinical Medical Laboratory
  • Edmonds, WA
  • NPI 1699894022

  Hospital

  Care Compare affiliation
• Swedish Health Services

  • General Acute Care Hospital
  • Seattle, WA
  • NPI 1306992151
  Care Compare affiliation
• Swedish Health Services

  dba Swedish/Issaquah

  • General Acute Care Hospital
  • Issaquah, WA
  • NPI 1851686059
  Care Compare affiliation
• St. Joseph Health Northern California, LLC

  dba Providence Santa Rosa Memorial Hospital

  • General Acute Care Hospital
  • Santa Rosa, CA
  • NPI 1134152549
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1178496000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1771804800000",
    "number": "1841403110",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "19020 33RD AVE W STE 210",
            "city": "LYNNWOOD",
            "state": "WA",
            "postal_code": "980364748",
            "telephone_number": "425-563-1500",
            "fax_number": "425-563-1501"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "19020 33RD AVE W STE 210",
            "city": "LYNNWOOD",
            "state": "WA",
            "postal_code": "980364748",
            "telephone_number": "425-563-1500",
            "fax_number": "425-563-1501"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "939 Caroline St",
            "address_purpose": "LOCATION",
            "city": "Port Angeles",
            "state": "WA",
            "postal_code": "983623909",
            "country_code": "US",
            "telephone_number": "360-417-7735",
            "fax_number": "360-565-9074",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "203 S Western Ave",
            "address_purpose": "LOCATION",
            "city": "Tonasket",
            "state": "WA",
            "postal_code": "988558803",
            "country_code": "US",
            "telephone_number": "509-486-2151",
            "fax_number": "509-223-1640",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ONDERSMA",
        "first_name": "ROSS",
        "middle_name": "MICHAEL",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2007-05-07",
        "last_updated": "2026-02-23",
        "certification_date": "2026-02-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "IN",
            "license": "01066258A",
            "primary": false
        },
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "WA",
            "license": "MD60292915",
            "primary": true
        },
        {
            "code": "207U00000X",
            "taxonomy_group": "",
            "desc": "Nuclear Medicine",
            "state": "WA",
            "license": "MD60292915",
            "primary": false
        },
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "MI",
            "license": "4301088540",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2022790",
            "state": "WA"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "rondersma140106@wm.providencedirect.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "939 Caroline St",
            "city": "Port Angeles",
            "state": "WA",
            "country_code": "US",
            "postal_code": "983623909",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Jeannie Omara, LMT
• Christopher B Omdahl, LMP
• David Gordon Omdal, MD
• Oncken Counseling Services
• Gerald R Oncken, PHD, RC
• One Family Chiropractic Clinic
• One Family Wellness Clinic LLC (Lynnwood Chiropractic & Injury Center)
• One Source Medical
• One World Nutrtional Services Inc.
• Options Treatment and Evaluations Inc

• Diagnostic Radiology Physician in Lynnwood, WA
• Providers in Lynnwood, WA by specialty
• Diagnostic Radiology Physician in Washington

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 23, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.