Medicare Enrolled
Dr. James Zimmerman, M.D.
Radiation Oncology · Redwood City, CA
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Speaking/Promotional
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. Zimmerman 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 →
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What this data tells you about Dr. Zimmerman
Dr. James Zimmerman is a radiation oncology specialist in Redwood City, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Zimmerman performed 1,706 Medicare services across 1,404 unique beneficiaries.
Between the years covered by Open Payments, Dr. Zimmerman received a total of $127,860 from 15 pharmaceutical and/or device companies across 218 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in radiation oncology. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Zimmerman 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.
✓ 19 years in practice
▲ 1,706 Medicare services
$127,860 industry payments
Medicare Practice Summary
Medicare Utilization ↗1,706
Medicare services
Bottom 41% in CA for radiation oncology
1,404
Unique beneficiaries
$134
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~90 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 |
|---|---|---|---|
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
423 | $80 | $247 |
| Ultrasound of arm and leg arteries This procedure uses sound waves to create images of the blood vessels in the arms and legs. It allows healthcare providers to examine the structure and blood flow within these arteries. |
164 | $69 | $446 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
120 | $116 | $364 |
| Ultrasound of leg arteries or grafts An ultrasound exam that uses sound waves to create images of the arteries in one leg or any grafts present in that leg. |
99 | $131 | $783 |
| Ultrasound of hemodialysis access An ultrasound imaging test used to evaluate the blood flow and structure of a hemodialysis access site. |
95 | $136 | $536 |
| 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. |
94 | $253 | $1,184 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
83 | $100 | $365 |
| 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. |
71 | $198 | $1,171 |
| Ultrasound guidance for blood vessel access Use of ultrasound imaging to help locate and access a blood vessel. This guidance assists healthcare providers in performing procedures such as inserting IV lines or drawing blood. |
70 | $12 | $77 |
| Radiologist review of arm or leg artery image A radiologist reviews images of the arteries in the arm or leg. This process involves analyzing the visual data to assess the blood vessels. |
54 | $71 | $355 |
| New patient office visit, 15-29 minutes An initial office visit for a new patient lasting 15 to 29 minutes. This code is used when the total time spent on the date of the encounter meets this duration threshold. |
47 | $71 | $254 |
| Arterial thrombectomy, chest, neck, or brain A procedure to remove a blood clot and part of an artery in the chest, neck, or brain. |
32 | $935 | $4,592 |
| Radiologist review of abdominal aorta image A radiologist reviews images of the abdominal aorta to evaluate the blood vessel. |
32 | $58 | $376 |
| 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. |
32 | $117 | $638 |
| Radiologist review of additional artery image A radiologist reviews an additional image of an artery. This step involves professional interpretation of the imaging data. |
24 | $41 | $139 |
| Complete ultrasound of aorta, vena cava, groin vessels or bypass grafts A complete ultrasound exam of the aorta, vena cava, groin vessels, or bypass grafts. This imaging test uses sound waves to visualize these blood vessels. |
24 | $176 | $889 |
| Intracranial artery catheter insertion A radiologist inserts a tube into an artery in the brain for diagnostic or treatment purposes. |
21 | $376 | $7,998 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
20 | $126 | $554 |
| Ultrasound of blood vessel, initial vessel An ultrasound exam of a blood vessel that includes a radiologist's review of the initial vessel. |
18 | $67 | $5,804 |
| Ultrasound of aorta, vena cava, groin vessels or bypass grafts This procedure uses sound waves to create images of the aorta, vena cava, groin vessels, or bypass grafts. It allows for the visualization of these blood vessels and any surgical grafts. |
17 | $108 | $571 |
| Office visit, established patient (10-19 min) An office visit for an existing patient lasting 10 to 19 minutes. The visit involves medical evaluation and management of the patient's condition. |
17 | $55 | $154 |
| 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. |
16 | $201 | $1,037 |
| Hemodialysis circuit intervention with balloon dilation A procedure to insert a needle or tube into a hemodialysis circuit and dilate the dialysis segment using a balloon, with radiological review. |
15 | $191 | $5,382 |
| Balloon dilation of leg artery A procedure to widen a narrowed or blocked artery in the leg using a balloon catheter to restore blood flow. |
15 | $255 | $6,622 |
| Arterial plaque removal in leg A procedure to remove plaque buildup from the arteries in the leg to restore blood flow. |
15 | $444 | $25,820 |
| Radiologist review of abdominal aorta and leg artery images A radiologist reviews images of the abdominal aorta and the arteries in both legs. This process involves analyzing the visual data to assess the condition of these blood vessels. |
14 | $82 | $560 |
| Ultrasound of head and neck blood flow, one side An ultrasound exam that uses sound waves to visualize and assess blood flow in the vessels on one side of the head and neck. |
14 | $124 | $821 |
| Arm vein relocation with artery connection for hemodialysis A surgical procedure to move a vein in the arm and connect it to an artery to create access for hemodialysis. |
13 | $529 | $2,613 |
| Balloon angioplasty of leg artery, initial vessel A procedure to widen a narrowed or blocked artery in the leg using a balloon catheter. This is performed on the first vessel treated during the session. |
13 | $325 | $9,922 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
12 | $162 | $489 |
| Insertion of tunneled central venous catheter for infusion, age 5+ A surgical procedure to place a long-term catheter into a large vein for delivering medications or fluids. The catheter is tunneled under the skin to reduce infection risk and provide stable access for patients aged 5 and older. |
11 | $212 | $4,084 |
| Fluoroscopic guidance for central vein access device Use of live X-ray imaging to guide the placement or removal of a central vein access device. |
11 | $16 | $139 |
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.
4.3% high complexity
41.1% medium
54.6% routine
Industry Payment Transparency
Open Payments through 2024 ↗$127,860
Total received (2018-2024)
Avg $18,266/year across 7 years
Top 2% in CA for radiation oncology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
15
Companies
218
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.
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$100,002 (78.2%)
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$14,748 (11.5%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$13,110 (10.3%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,674
2023
$4,809
2022
$4,691
2021
$1,554
2020
$12,909
2019
$46,558
2018
$55,665
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Penumbra, Inc.
$1,100
W. L. Gore & Associates, Inc.
$281
Medtronic, Inc.
$229
Philips North America LLC
$64
Top 3 companies account for 96.2% of 2024 payments
All-time payments by company (2018-2024) ›
W. L. Gore & Associates, Inc.
$69,156
Medtronic Vascular, Inc.
$24,114
Philips Electronics North America Corporation
$21,164
Penumbra, Inc.
$4,837
Medtronic, Inc.
$4,418
Provisio Medical
$2,000
Silk Road Medical, Inc.
$1,216
Cook Incorporated
$479
BARD PERIPHERAL VASCULAR, INC.
$139
Abbott Laboratories
$138
Philips North America LLC
$64
Cook Medical LLC
$51
Janssen Pharmaceuticals, Inc
$43
LeMaitre Vascular, Inc.
$23
Hologic, LLC
$19
Top 3 companies account for 89.5% of all-time payments
Associated products mentioned in payments ›
(6342) Intrasight Integ · (6554) Periph Vasc Undiv · (6554) Peripheral Vascular Undivided · (6577) Visions 014 · (792) Multi Modality IVUS Other Systems · (9281) Turbo Elite · (BR5) Peripheral IVUS · ABRE · ACUSEAL Vascular Graft · Abre · C3 Delivery System · COOK MEDICAL FILTERS · ELLIPSYS VASCULAR ACCESS SYSTEM · ENDURANT IIS · ENROUTE Transcarotid Neuroprotection System · EXCLUDER AAA Endoprosthesis · EXCLUDER Conformable AAA Endoprosthesis with Active Control · EXCLUDER Iliac Branch Endoprosthesis · Endurant · Fluent · GORE EXCLUDER AAA Endoprosthesis · GORE TAG Thoracic Branch Endoprosthesis · GORE VIABAHN Endoprosthesis with Heparin · IGT D Peripheral · IGT Devices _ Undivided · IGT_D Peripheral · IGT_D Systems · IN.PACT ADMIRAL · IN.PACT AV · IN.PACT Admiral · IVUS Systems · Image Guided Therapy Devices _ Peripheral · Image Guided Therapy Devices _ Therapy · Indigo System · JETI PERIPHERAL CATHETER · Lasers · PRUITT F3 CAROTID SHUNT · Penumbra System · Stellarex Short · Trilogy 100 · TurboHawk · VIABAHN Endoprosthesis · VIABAHN Endoprosthesis with Heparin Bioactive Surface · VIABAHN VBX Balloon Expandable Endoprosthesis · Valiant Captivia · XARELTO
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 →
The majority of payments (78%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in radiation oncology and does not inherently indicate bias, but patients may wish to be aware. Total industry engagement is in the top 2% for radiation oncology in CA.
Geographic Context
Radiation oncologists within 10 mi
555
Per 100K population
74.5
County median income
$156,000
Nearest hospital
SEQUOIA HOSPITAL
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 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. Zimmerman is a clinical cardiology specialist, with moderate Medicare volume, with speaking/promotional industry engagement in the top 2% of CA peers, with 19 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. Zimmerman experienced with office visit, established patient (20-29 min)?
Based on Medicare claims data, Dr. Zimmerman performed 423 office visit, established patient (20-29 min) 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. Zimmerman receive payments from pharmaceutical companies?
Yes. Dr. Zimmerman received a total of $127,860 from 15 companies across 218 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. Zimmerman's costs compare to other radiation oncologists in Redwood City?
Dr. Zimmerman's average Medicare payment per service is $134. 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. Zimmerman) 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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