Medicare Enrolled
Dr. Sean Chang, M.D.
Neuroradiology Physician · Oxnard, CA
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-engagement
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Chang from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
Are you Dr. Chang?
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What this data tells you about Dr. Chang
Dr. Sean Chang is a neuroradiology physician in Oxnard, CA, with 15 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 21,279 Medicare services across 1,195 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $230 from 5 pharmaceutical and/or device companies across 12 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in neuroradiology physician. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Chang is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 15 years in practice
▲ Top 10% volume in CA
$230 industry payments
Medicare Practice Summary
Medicare Utilization ↗21,279
Medicare services
Top 10% in CA for neuroradiology physician
1,195
Unique beneficiaries
$8
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~1,419 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| MRI contrast dye injection (gadobutrol) | 16,660 | $0 | $1 |
| Contrast dye for imaging (iodine-based) A contrast agent containing 300-399 mg/ml of iodine used to enhance imaging studies. It is administered per milliliter to improve the visibility of internal structures. |
3,565 | $0 | $0 |
| MRI of brain with and without contrast An MRI scan of the brain using contrast dye both before and after administration to provide detailed images of brain structures. |
123 | $273 | $3,844 |
| Complete ultrasound of abdomen A diagnostic imaging test that uses sound waves to create detailed pictures of the organs and structures within the abdomen. |
107 | $84 | $409 |
| Complete ultrasound of retroperitoneum An ultrasound examination of the structures located behind the abdominal cavity. |
77 | $80 | $396 |
| MRI of lower spine, without contrast A magnetic resonance imaging scan of the lower spinal canal that does not use contrast dye to create detailed images of the spine. |
74 | $158 | $1,972 |
| Ultrasound of head and neck soft tissue This procedure uses sound waves to create images of the soft tissues in the head and neck area. It allows for the visualization of structures beneath the skin without using radiation. |
72 | $79 | $288 |
| MRI scan of brain, without contrast A magnetic resonance imaging test of the brain that does not use contrast dye. This procedure creates detailed images of the brain's structure using magnetic fields and radio waves. |
57 | $151 | $1,800 |
| Ultrasound of arm or leg veins An ultrasound exam of the veins in the arm or leg. The test uses sound waves to check blood flow and may include compression and other maneuvers. |
49 | $152 | $823 |
| MRI of upper spine without contrast An MRI scan of the upper spinal canal that does not use contrast dye. This imaging test uses magnetic fields and radio waves to create detailed pictures of the spine. |
39 | $157 | $1,819 |
| Ultrasound of leg arteries or grafts An imaging test that uses sound waves to create pictures of the blood vessels in the legs or any surgical grafts present. |
36 | $199 | $1,012 |
| Ultrasound of arm or leg veins An ultrasound exam of the veins in one arm or leg using compression and other maneuvers to assess blood flow and check for blockages. |
36 | $104 | $561 |
| MRI scan of both breasts A magnetic resonance imaging test that creates detailed pictures of both breasts to help evaluate breast tissue. |
33 | $295 | $1,403 |
| Ultrasound of arm and leg arteries A non-invasive imaging test that uses sound waves to examine the blood vessels in the arms and legs. It evaluates blood flow and checks for blockages or other vascular issues. |
29 | $93 | $616 |
| Limited abdominal ultrasound A focused ultrasound examination of the abdomen to evaluate specific organs or areas. This procedure uses sound waves to create images of internal structures. |
28 | $68 | $294 |
| CT scan of head/brain, without contrast A CT scan uses X-rays to create detailed images of the head or brain without the use of contrast dye. |
27 | $80 | $795 |
| Complete pelvic ultrasound An imaging test using sound waves to create pictures of the organs and structures within the pelvis. |
26 | $82 | $326 |
| MRI of arm joint, without contrast An MRI scan uses magnetic fields and radio waves to create detailed images of the arm joint. This specific procedure is performed without the use of a contrast dye. |
25 | $180 | $1,760 |
| Limited ultrasound of joint or extremity A focused ultrasound exam of a specific joint or other structure in the arm or leg, excluding blood vessels. |
24 | $27 | $102 |
| Transvaginal pelvic ultrasound An ultrasound exam using a probe inserted into the vagina to image the uterus, ovaries, fallopian tubes, cervix, and surrounding pelvic structures. |
23 | $84 | $326 |
| Ultrasound-guided fine needle aspiration biopsy, first lesion A biopsy procedure where a thin needle is used to collect tissue samples from a growth, guided by ultrasound imaging. This code applies to the first lesion or mass sampled during the session. |
22 | $105 | $425 |
| CT scan of chest, without contrast A computed tomography scan of the chest area that uses X-rays to create detailed images without the use of contrast dye. |
21 | $108 | $1,012 |
| MRI of eye socket, face, and/or neck with and without contrast This procedure uses magnetic resonance imaging to create detailed pictures of the bones in the eye socket, face, and neck. It is performed both before and after the administration of a contrast dye to enhance the images. |
19 | $322 | $1,112 |
| MRI of leg joint, without contrast A magnetic resonance imaging scan of a joint in the leg performed without the use of contrast dye. |
17 | $146 | $1,760 |
| MRI of middle spinal canal, without contrast This procedure uses magnetic resonance imaging to create detailed pictures of the middle section of the spinal canal. It is performed without the use of contrast dye. |
16 | $148 | $1,991 |
| Ultrasound guidance for needle placement Use of ultrasound imaging to guide the precise placement of a needle during a medical procedure. |
15 | $52 | $497 |
| Ultrasound of head and neck blood flow, bilateral An ultrasound exam that uses sound waves to visualize and assess blood flow in the vessels of both the head and the neck. |
14 | $146 | $850 |
| CT scan of lower spine, without contrast A computed tomography scan that creates detailed images of the lower spine using X-rays without the use of contrast dye. |
12 | $111 | $1,012 |
| Breast biopsy with ultrasound-guided localization device placement This procedure involves taking a tissue sample from a breast growth and placing a marker device to locate it, guided by ultrasound imaging. |
11 | $462 | $2,327 |
| MRI of head blood vessels without contrast An MRI scan that creates detailed images of the blood vessels in the head without using contrast dye. |
11 | $182 | $1,753 |
| MRI of abdomen with and without contrast An MRI scan of the abdomen using contrast dye before and after administration to create detailed images of internal structures. |
11 | $313 | $3,794 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
Industry Payment Transparency
Open Payments through 2024 ↗$230
Total received (2021-2024)
Avg $58/year across 4 years
Bottom 45% in CA for neuroradiology physician
5
Companies
12
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$230 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$107
2023
$72
2022
$23
2021
$28
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
PROGENICS PHARMACEUTICALS, INC.
$59
Blue Earth Diagnostics Limited
$29
Lilly USA, LLC
$19
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2021-2024) ›
Progenics Pharmaceuticals, Inc.
$102
PROGENICS PHARMACEUTICALS, INC.
$59
Blue Earth Diagnostics Limited
$29
Curium US LLC
$21
Lilly USA, LLC
$19
Top 3 companies account for 82.7% of all-time payments
Associated products mentioned in payments ›
AMYVID · Detectnet · POSLUMA · PYLARIFY
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Neuroradiology physicians within 10 mi
3
Per 100K population
0.4
County median income
$107,327
Nearest hospital
ST JOHNS REGIONAL MEDICAL CENTER
3.2 mi
3.2 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Chang is a mixed practice specialist, with above-average Medicare volume (top 10% in CA), with low-engagement industry engagement, with 15 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Chang experienced with mri contrast dye injection (gadobutrol)?
Based on Medicare claims data, Dr. Chang performed 16,660 mri contrast dye injection (gadobutrol) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Chang receive payments from pharmaceutical companies?
Yes. Dr. Chang received a total of $230 from 5 companies across 12 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Chang's costs compare to other neuroradiology physicians in Oxnard?
Dr. Chang's average Medicare payment per service is $8. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Chang) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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