Medicare Enrolled
Dr. Michael Chiou, M.D.
Radiation Oncology · Mountain View, 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. Chiou 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. Chiou?
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What this data tells you about Dr. Chiou
Dr. Michael Chiou is a radiation oncology specialist in Mountain View, CA, with 15 years of NPI registration. Based on federal Medicare data, Dr. Chiou performed 21,546 Medicare services across 3,043 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chiou received a total of $124 from 1 pharmaceutical and/or device company across 1 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in radiation oncology. 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. Chiou 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 9% volume in CA
$124 industry payments
Medicare Practice Summary
Medicare Utilization ↗21,546
Medicare services
Top 9% in CA for radiation oncology
3,043
Unique beneficiaries
$14
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~1,436 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 |
|---|---|---|---|
| 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. |
12,922 | $0 | $2 |
| MRI contrast dye injection (gadobutrol) | 5,675 | $0 | $2 |
| Chest X-ray, 2 views An X-ray imaging test of the chest that captures two different angles to visualize the lungs, heart, and chest wall. |
275 | $32 | $171 |
| Screening mammography An X-ray of the breast used to detect breast cancer in women who have no signs or symptoms of the disease. |
265 | $175 | $714 |
| 3D screening mammography (tomosynthesis) A screening imaging test of the breast using 3D technology to detect potential abnormalities. |
235 | $68 | $280 |
| Bone density scan (DEXA) A test that uses low-dose X-rays to measure bone mineral density in the hip, pelvis, and spine. It helps assess bone strength and risk of fractures. |
190 | $51 | $255 |
| Foot X-ray, 3+ views An X-ray imaging test of the foot that captures at least three different views to evaluate the bones and joints. |
131 | $35 | $165 |
| Knee X-ray, 1-2 views An X-ray imaging test of the knee joint using one to two different angles to visualize the bones and surrounding structures. |
123 | $34 | $163 |
| X-ray of lower and sacral spine, 2-3 views An X-ray imaging test that captures 2 to 3 views of the lower back and sacral spine to visualize the bones and joints in this area. |
106 | $38 | $183 |
| Hip X-ray, 1 view An X-ray image of the hip joint taken from a single angle to visualize the bones and surrounding structures. |
99 | $32 | $143 |
| X-ray of both knees, standing An X-ray image of both knees taken while the patient is standing to assess bone alignment and joint space under weight-bearing conditions. |
96 | $38 | $175 |
| Shoulder X-ray, 2+ views An X-ray imaging test of the shoulder joint using at least two different angles to visualize the bones and surrounding structures. |
84 | $34 | $159 |
| 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. |
82 | $134 | $989 |
| CT scan of abdomen and pelvis with contrast A CT scan that uses dye to create detailed images of the abdomen and pelvis. This imaging test helps doctors examine internal organs and structures in these areas. |
71 | $336 | $1,642 |
| MRI of leg joint, without contrast A magnetic resonance imaging scan of a joint in the leg performed without the use of contrast dye. |
65 | $219 | $1,423 |
| Ankle X-ray, minimum 3 views An X-ray imaging test of the ankle that captures at least three different angles to evaluate the bones and joints. |
59 | $36 | $167 |
| Knee X-ray, 3 views An X-ray imaging test of the knee joint that captures three different angles to evaluate the bones and surrounding structures. |
51 | $44 | $197 |
| X-ray of upper spine, 2-3 views An X-ray imaging test of the upper spine using two to three different angles to visualize the bones and structures. |
43 | $38 | $182 |
| Wrist X-ray, minimum 3 views An imaging test using X-rays to capture at least three different angles of the wrist bones and joints. |
41 | $43 | $200 |
| 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. |
40 | $99 | $775 |
| CT scan of chest with contrast A computed tomography scan of the chest using a contrast dye to enhance the visibility of internal structures. |
40 | $125 | $1,238 |
| X-ray of hand, minimum of 3 views An X-ray imaging test of the hand that captures at least three different angles to visualize the bones and joints. |
40 | $34 | $170 |
| 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. |
36 | $101 | $546 |
| 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. |
35 | $228 | $1,423 |
| 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. |
35 | $83 | $559 |
| X-ray of finger, minimum of 2 views An X-ray imaging test of a finger using at least two different angles to visualize the bones and surrounding structures. |
31 | $39 | $180 |
| CT scan of abdomen and pelvis, without contrast A computed tomography scan that creates detailed images of the abdominal and pelvic organs. The procedure is performed without the use of intravenous contrast dye. |
31 | $185 | $1,070 |
| Complete ultrasound of retroperitoneum An ultrasound examination of the structures located behind the abdominal cavity. |
31 | $110 | $668 |
| 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. |
31 | $123 | $638 |
| 3D radiographic procedure A radiographic imaging technique that creates three-dimensional representations of internal structures. |
29 | $25 | $337 |
| Digital breast tomosynthesis (3D mammogram) A specialized imaging test that creates three-dimensional pictures of the breast tissue to help detect abnormalities. |
28 | $54 | $269 |
| Limited ultrasound of 1 breast A focused ultrasound examination of a single breast to evaluate specific areas of concern. |
26 | $80 | $444 |
| Complete pelvic ultrasound An imaging test using sound waves to create pictures of the organs and structures within the pelvis. |
26 | $106 | $644 |
| Diagnostic mammography of both breasts | 26 | $159 | $889 |
| Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries | 25 | $288 | $745 |
| 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. |
24 | $126 | $347 |
| 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. |
23 | $376 | $3,358 |
| MRI of pelvis with and without contrast A magnetic resonance imaging scan of the pelvic area performed both before and after the administration of a contrast dye to enhance image detail. |
22 | $347 | $3,350 |
| Complete ultrasound of abdomen A diagnostic imaging test that uses sound waves to create detailed pictures of the organs and structures within the abdomen. |
22 | $115 | $726 |
| Complete ultrasound of abdomen and pelvis blood flow This procedure uses sound waves to create images of blood flow in the arteries and veins of the abdomen and pelvis. It evaluates the rate and direction of blood movement within these vessels. |
20 | $267 | $1,208 |
| Elbow X-ray, minimum 3 views An X-ray imaging test of the elbow joint that captures at least three different angles to visualize the bones and surrounding structures. |
19 | $30 | $164 |
| Abdominal X-ray, 1 view An X-ray image of the abdomen taken from a single angle to visualize internal structures. |
19 | $26 | $140 |
| Nuclear medicine scan from skull base to mid-thigh with CT A nuclear medicine imaging study covering the area from the base of the skull to the middle of the thighs, performed alongside a CT scan. |
19 | $1,785 | $9,813 |
| Pelvis X-ray, 1-2 views An X-ray imaging test of the pelvic area using one to two different angles to visualize the bones and joints. |
18 | $27 | $146 |
| CT scan of abdomen with and without contrast A CT scan of the abdomen performed both before and after the administration of contrast dye to provide detailed images of internal structures. |
17 | $249 | $1,538 |
| X-ray of middle spine, 2 views An X-ray imaging test that produces two views of the middle section of the spine to visualize the bones and joints. |
16 | $27 | $164 |
| Knee X-ray, 4 or more views An imaging test using X-rays to create multiple pictures of the knee joint from different angles. |
16 | $48 | $229 |
| MRI of abdomen without contrast An MRI scan of the abdomen that uses magnetic fields and radio waves to create detailed images of internal organs and tissues without the use of contrast dye. |
16 | $196 | $2,129 |
| X-ray of lower and sacral spine, minimum of 4 views An X-ray imaging test of the lower back and sacrum using at least four different angles to visualize the bones and joints. |
15 | $45 | $277 |
| Wrist X-ray, 2 views An X-ray imaging test of the wrist using two different angles to visualize the bones and joints. |
15 | $29 | $164 |
| CT scan of abdomen and pelvis with contrast A CT scan of the abdomen and pelvis using contrast dye before and after administration to visualize internal structures. |
15 | $352 | $1,924 |
| Diagnostic mammography of 1 breast An X-ray examination of one breast to evaluate specific breast symptoms or abnormalities. |
15 | $132 | $700 |
| Rib X-ray, minimum 3 views An X-ray imaging test of the ribs on one side of the body. The procedure includes a minimum of three different views to capture detailed images. |
14 | $39 | $188 |
| X-ray of both hips, 2 views An X-ray imaging test that captures two views of both hip joints to evaluate bone structure and alignment. |
14 | $42 | $187 |
| 3D radiographic procedure with computerized image postprocessing A radiographic imaging procedure that creates three-dimensional images using computerized processing of the captured data. |
13 | $79 | $420 |
| CT scan of face, without contrast A computed tomography scan that creates detailed images of the facial structures. This procedure is performed without the use of intravenous contrast dye. |
12 | $135 | $1,072 |
| Low dose CT scan of chest for lung cancer screening A specialized CT scan of the chest using a lower radiation dose to screen for lung cancer. |
12 | $190 | $622 |
| X-ray of sacrum and tailbone, minimum of 2 views An X-ray imaging test of the sacrum and tailbone using at least two different angles to visualize the bones. |
12 | $28 | $120 |
| CT scan of leg, without contrast A computed tomography scan of the leg performed without the use of contrast dye. This imaging test uses X-rays to create detailed cross-sectional images of the leg's internal structures. |
12 | $144 | $1,169 |
| Ultrasound of abdomen and pelvis blood flow An ultrasound exam that uses sound waves to visualize and assess blood flow through the arteries and veins in the abdomen and pelvis. |
12 | $143 | $1,076 |
| X-ray of lower leg, 2 views An X-ray imaging test of the lower leg using two different angles to visualize the bones and surrounding structures. |
11 | $31 | $149 |
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 2018 ↗$124
Total received (2018-2018)
Bottom 40% in CA for radiation oncology
1
Company
1
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
$124 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2018
$124
Payments by company (2018)
Consulting
Speaking
Meals & Travel
Research
Genentech USA, Inc.
$124
Top 3 companies account for 100.0% of 2018 payments
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
Radiation oncologists within 10 mi
538
Per 100K population
28.3
County median income
$159,674
Nearest hospital
EL CAMINO HEALTH
0.0 mi
0.0 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 2018 |
| 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. Chiou is a mixed practice specialist, with above-average Medicare volume (top 9% 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. Chiou experienced with contrast dye for imaging (iodine-based)?
Based on Medicare claims data, Dr. Chiou performed 12,922 contrast dye for imaging (iodine-based) 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. Chiou receive payments from pharmaceutical companies?
Yes. Dr. Chiou received a total of $124 from 1 company across 1 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. Chiou's costs compare to other radiation oncologists in Mountain View?
Dr. Chiou's average Medicare payment per service is $14. 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. Chiou) 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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