DR. ROSS MICHAEL ONDERSMA MD
NPI 1841403110
Radiology - Diagnostic Radiology in Lynnwood, WA

Q: What is Ross Ondersma's NPI number?

The NPI number for Ross Ondersma is 1841403110. It was assigned to this individual provider in the NPPES registry on May 7, 2007.

Q: Where is Ross Ondersma located?

Ross Ondersma practices at 19020 33rd Ave W Ste 210, Lynnwood, WA 98036. The listed phone number is (425) 563-1500.

Q: What is Ross Ondersma's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Q: Is Ross Ondersma enrolled in Medicare?

Yes. Ross Ondersma is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Q: What insurance does Ross Ondersma accept?

Health plans from Arkansas Blue Cross and Blue Shield, Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company, Health Advantage and Moda Health Plan, Inc. and 2 other insurers list Ross Ondersma as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Q: Is Ross Ondersma affiliated with any hospitals?

According to CMS data, Ross Ondersma is affiliated with Providence Regional Medical Center Everett, Swedish Edmonds Hospital, Swedish Medical Center and Olympic Medical Center.

Q: When was this NPI record last updated?

The NPPES record for Ross Ondersma was last updated on February 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since May 07, 2007PECOS EnrolledAccepts Medicare Assignment

19020 33RD AVE W STE 210, LYNNWOOD, WA 98036(425) 563-1500(425) 563-1501 Get Directions Write a Review

NPPES record last updated: February 23, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jun 23, 2021, Mar 8, 2018 (2 updates tracked since 2018).

On this page

About Dr. Ross Michael Ondersma Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. ROSS MICHAEL ONDERSMA MD (NPI 1841403110) is an individual diagnostic radiology provider in Lynnwood, Washington, licensed in Washington (MD60292915) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, is affiliated with Providence Regional Medical Center Everett, and is a graduate of Other (2006).

NPPES Registry Identity

NPI1841403110

Entity TypeIndividualMale

Primary Taxonomy2085R0202X

Provider Legal NameDR. ROSS MICHAEL ONDERSMACredential: MD

Location Address19020 33RD AVE W STE 210Lynnwood, WA 98036-4748

Mailing Address19020 33rd Ave W Ste 210Lynnwood, WA 98036-4748 · (425) 563-1500 · Fax (425) 563-1501

Phone(425) 563-1500

Fax(425) 563-1501

Sole ProprietorNo

Medical School CMSOtherGraduated 2006

Enumeration DateMay 7, 2007

Last NPPES UpdateFebruary 23, 20262 updates tracked since enumeration

NPPES CertifiedFebruary 23, 2026

✔ NPI 1841403110 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0202X

Licenses✔ Licensed in WA · MD60292915✔ Licensed in IN · 01066258A✔ Licensed in MI · 4301088540

Definition

A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.

Also ListedNuclear MedicineTaxonomy 207U00000X · License MD60292915 (WA)

19020 33RD AVE W STE 210, Lynnwood, WA 98036

Open in Google Maps ↗

Other Identifiers 1

Medicaid2022790WA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Arkansas Blue Cross and Blue Shield, Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Ross Michael Ondersma Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8123279486

PECOS Enrollment IDI20121114000090, I20250522001275

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 37

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Nuclear medicine study from skull base to mid-thigh with ct scan 78815

A nuclear medicine study from skull base to mid-thigh with a CT scan involves using a small amount of radioactive material and CT imaging to examine body tissues and organs. This helps detect any abnormalities by providing detailed images of the body's internal structure.

451 services417 patients

Nuclear medicine study from skull base to mid-thigh with ct scan 78815

348 services329 patients

Piflufolastat f-18, diagnostic, 1 millicurie A9595

Piflufolastat F-18 is a radioactive diagnostic agent used in PET scans. It helps visualize certain cells in your body, aiding doctors in diagnosing specific conditions. This service involves injecting 1 millicurie of the agent into your body.

310 services33 patients

Nuclear medicine study of bone and/or joint whole body 78306

A nuclear medicine study of bone and/or joint whole body involves injecting a small amount of radioactive material into your body. This material travels to your bones and emits energy. A special camera captures this energy, creating images of your bones to help identify any abnormalities.

183 services173 patients

X-ray of chest, 1 view 71045

A chest X-ray, 1 view, is a quick, painless test that produces images of the structures within your chest, such as your heart, lungs, and blood vessels. It helps in diagnosing conditions like pneumonia, heart problems, or lung cancer. You'll stand in front of a machine that emits X-rays, which pass through your body to create the image.

182 services181 patients

Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries A9552

Fluorodeoxyglucose F-18 FDG is a radioactive drug used in PET scans. It helps doctors see how your tissues and organs are functioning. The drug is given in a specific dose, up to 45 millicuries, depending on your body size and the type of scan.

117 services105 patients

Ct scan of abdomen and pelvis with contrast 74177

A CT scan of the abdomen and pelvis with contrast is an imaging procedure. A special dye, called contrast, is used to make certain areas more visible. This can help identify issues such as infections, tumors, or other abnormalities. The procedure is painless and usually takes about 30 minutes.

92 services92 patients

Ct scan of blood vessels of chest with contrast 71275

A CT scan of the chest with contrast is a non-invasive imaging test. It uses X-rays and a special dye to get detailed images of your blood vessels in the chest. This helps in diagnosing conditions related to heart and lungs.

78 services78 patients

Nuclear medicine study whole body with ct scan 78816

A Nuclear Medicine Study with a CT Scan is a diagnostic procedure. It uses a small amount of radioactive substance and a CT scan to create detailed images of your body. These images help doctors diagnose, monitor, and treat various conditions.

61 services56 patients

Nuclear medicine study, spect imaging with concurrent ct scan, 1 area or single acquisition, single day imaging 78830

A nuclear medicine study with SPECT and concurrent CT scan is a special imaging test. It uses a small amount of radioactive substance and advanced imaging techniques to create detailed pictures of your internal body structures. It aids in diagnosing and tracking the progress of treatment for various diseases.

60 services60 patients

Nuclear medicine study of liver and bile duct system 78226

A nuclear medicine study of the liver and bile duct system involves the use of a small amount of radioactive material to create detailed images. This helps doctors examine the liver's function and structure, and detect any abnormalities in the bile ducts.

54 services52 patients

Ct scan head or brain without contrast 70450

A CT scan of the head or brain without contrast is a non-invasive imaging procedure. It uses X-rays to create detailed pictures of your brain, skull, and other structures inside your head. It helps to detect conditions like strokes, tumors, or injuries. No dye (contrast) is used in this test.

52 services52 patients

Ct scan of chest with contrast 71260

A CT scan of the chest with contrast is an imaging procedure. A special dye (contrast) is used to highlight specific areas in your body, providing clearer pictures of your chest. This helps in diagnosing conditions related to your lungs, heart, and other chest structures.

51 services51 patients

Nuclear medicine study whole body with ct scan 78816

50 services49 patients

Nuclear medicine studies of heart muscle at rest and with stress and spect 78452

Nuclear medicine studies of the heart involve two parts: rest and stress. During rest, images are taken of your heart at ease. During stress, images are taken after exercise or medication-induced stress. SPECT is a special imaging technique providing 3D pictures of your heart, helping identify any issues.

44 services44 patients

Nuclear medicine study of bone taken at different times 78315

A nuclear medicine bone study involves injecting a small amount of radioactive material into your body. This material collects in the bones and is detected by a special camera to create images. These images are taken at different times to track changes and help diagnose bone conditions.

43 services43 patients

Nuclear medicine study, spect imaging, 1 area or single acquisition, single day imaging 78803

A nuclear medicine study with SPECT involves a safe, small amount of radioactive substance to help visualize body organs. SPECT, or Single Photon Emission Computed Tomography, creates detailed 3D images. This helps doctors diagnose and monitor conditions in a specific body area.

42 services41 patients

Nuclear medicine study of stomach to assess emptying 78264

A nuclear medicine study of the stomach assesses how quickly food leaves the stomach. A safe, radioactive substance is added to a meal. The radiation emitted is tracked, creating images that show the food's progress through the stomach. It's non-invasive and painless.

40 services40 patients

Nuclear medicine study of lung ventilation and circulation 78582

A nuclear medicine lung ventilation and circulation study uses a safe radioactive material to create images of air and blood flow in your lungs. It helps identify issues like blood clots or lung diseases. You inhale or receive an injection of this material, and a special camera captures the images.

38 services38 patients

Nuclear medicine studies of kidney, blood flow, and function 78709

Nuclear medicine studies of the kidney, blood flow, and function involve using small amounts of radioactive materials to create images of your kidneys. This helps in assessing their structure and working condition, aiding in early diagnosis and treatment planning.

36 services34 patients

X-ray of chest, 2 views 71046

A chest X-ray, 2 views, is a quick, painless test that creates pictures of the structures inside your chest, such as your heart, lungs, and blood vessels. Two different angles are used to get a comprehensive view. This helps in diagnosing conditions like pneumonia, heart problems, or lung cancer.

32 services32 patients

Nuclear medicine study of liver and bile duct system with use of drugs 78227

A nuclear medicine study of the liver and bile duct system involves injecting a safe, radioactive substance into the body. This substance helps create images of these areas on a special camera. It's often combined with drug use to improve image clarity and aid in diagnosing various conditions.

30 services30 patients

Ct scan of chest with contrast 71260

28 services28 patients

Ct scan of chest without contrast 71250

A CT scan of the chest without contrast is a non-invasive imaging procedure. It uses special X-ray equipment to produce detailed images of your chest area, including your lungs and heart. It can help diagnose conditions such as lung diseases or heart disorders. It doesn't involve any dyes or contrast agents.

24 services24 patients

X-ray of abdomen, 1 view 74018

An X-ray of the abdomen, 1 view, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the structures in your abdomen, such as the stomach, liver, and intestines. This can help identify issues like blockages, infections, or injuries.

24 services23 patients

Ct scan of abdomen and pelvis without contrast 74176

A CT scan of the abdomen and pelvis is a non-invasive medical test. It uses special X-ray equipment to create detailed images of your abdominal and pelvic areas. This helps doctors examine organs, tissues, and vessels. No contrast dye is used in this procedure.

22 services22 patients

Ct scan of abdomen and pelvis with contrast 74177

22 services22 patients

Ct scan of upper spine without contrast 72125

A CT scan of the upper spine without contrast is a non-invasive imaging test that uses X-rays to capture detailed images of your neck and upper back. It helps in identifying issues like fractures, tumors, or infections. No dye (contrast) is used in this scan.

19 services19 patients

Nuclear medicine study of heart pumping function by labeling red blood cells with measurement of internal blood volume ejected with every beat over multiple cycles 78472

This procedure, known as a nuclear medicine study, examines your heart's function. It involves marking red blood cells and measuring the volume of blood your heart pumps with each beat. It's a safe, non-invasive way to assess how well your heart is working.

19 services17 patients

Nuclear medicine study of kidney, blood flow, and function 78707

A nuclear medicine study of the kidney is a diagnostic procedure. A small amount of radioactive material is injected into your body to highlight kidney function and blood flow. Images are then taken to assess how well your kidneys are working.

19 services18 patients

Nuclear medicine study of parathyroid with spect and ct scan 78072

A nuclear medicine study of the parathyroid with SPECT and CT scan is a diagnostic procedure. It uses a safe radioactive substance and imaging techniques to create detailed pictures of your parathyroid glands. These images help identify any abnormalities or diseases.

18 services18 patients

Injection of radioactive material for x-ray identification of lymph node 38792

This procedure involves injecting a safe radioactive substance into your body. It travels to your lymph nodes, making them visible on X-ray images. This helps in identifying any abnormal nodes for further examination. It's a standard part of many diagnostic processes.

16 services16 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

16 services16 patients

X-ray of chest, 2 views 71046

15 services15 patients

Nuclear medicine study of lymphatic system 78195

A nuclear medicine study of the lymphatic system involves injecting a safe, radioactive substance into your body. This substance travels through your lymphatic system and helps create images on a special camera. These images can help doctors diagnose conditions related to your immune system.

15 services15 patients

X-ray of shoulder, minimum of 2 views 73030

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

12 services12 patients

X-ray of wrist, minimum of 3 views 73110

An X-ray of the wrist, minimum of 3 views, is a diagnostic procedure that uses radiation to create images of your wrist from different angles. This helps detect fractures, infections, or other abnormalities for accurate diagnosis and treatment planning.

11 services11 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Providence Regional Medical Center Everett

Acute Care Hospitals · Everett, WA

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number500014

Location1321 Colby AvenueEverett, WA 98201 · Snohomish County

Emergency services Birthing friendly

Swedish Edmonds Hospital

Acute Care Hospitals · Edmonds, WA

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number500026

Location21601 76th Avenue WestEdmonds, WA 98026 · Snohomish County

Emergency services Birthing friendly

Swedish Medical Center

Acute Care Hospitals · Seattle, WA

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number500027

Location747 BroadwaySeattle, WA 98122 · King County

Emergency services Birthing friendly

Olympic Medical Center

Acute Care Hospitals · Port Angeles, WA

4/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number500072

Location939 Caroline StPort Angeles, WA 98362 · Clallam County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98036 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$88.29 typical visit price

range $57.27 – $172.80

Typical copayment $22.07 (range $14.31 – $43.20)

Most-billed visit code 99203

Established Patient

$71.29 typical visit price

range $18.56 – $141.11

Typical copayment $17.82 (range $4.64 – $35.27)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Appropriate Follow-up Imaging for Incidental Abdominal Lesions

Percentage of final reports for abdominal imaging studies for asymptomatic patients aged 18 years and older with one or more of the following noted incidentally with follow_up imaging recommended: - Liver lesion =< 0.5 cm - Cystic kidney lesion < 1.0 cm -…

Lower rates are better for this measure.

0%22 patients

Nuclear Medicine: Correlation with Existing Imaging Studies for All Patients Undergoing Bone Scintigraphy

Percentage of final reports for all patients, regardless of age, undergoing bone scintigraphy that include physician documentation of correlation with existing relevant imaging studies (e.g., x-ray, MRI, CT, etc.) that were performed

100%443 patients

Radiation Consideration for Adult CT: Utilization of Dose Lowering Techniques

Percentage of final reports for patients aged 18 years and older undergoing CT with documentation that one or more of the following dose reduction techniques were used: - Automated exposure control - Adjustment of the mA and/or kV according to patient size -…

100%395 patients

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. MICHAEL LARSON M.D.

Radiology (Vascular & Interventional Radiology)