Dr. Junichi Shimamura , MD
Surgery โข Valhalla, NY
100 Woods Rd
Valhalla, NY 105951530
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on February 13, 2023; this date does not establish years in practice.
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Published CMS data list 64 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 33361 โ Replacement of aortic valve through the skin and femoral artery: 48 service units.
- 33533 โ Coronary artery bypass using artery graft, 1 graft: 16 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See the full table ยท Guide: How to read Medicare Part B data
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Fewer Medicare Part B services than 65% of clinicians listed under Surgery in Valhalla, NY (2024, 13 clinicians with data). Median for this group: 118. Middle half: 56 to 194.
Fewer Medicare Part B services than 75% of clinicians listed under Surgery in New York (2024, 991 clinicians with data). Median for this group: 191. Middle half: 83 to 381.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
Practice Location & Contact Primary Location
100 Woods Rd
Valhalla, NY 105951530
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Westchester Medical Center Advanced Physician Services Pc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
2008
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
100 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $53,890 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $42,835 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Open Payments general payments, program year 2025
All general payments: $7,377.13 across 46 records.
By nature of payment
- Travel and Lodging: $5,187.56 across 13 records.
- Food and Beverage: $2,189.57 across 33 records.
Reporting-company totals (3 largest of 8)
- ABIOMED: $1,762.11 across 21 records.
- W. L. Gore & Associates, Inc.: $1,641.93 across 7 records.
- TransMedics, Inc.: $1,620.33 across 2 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
18 years (graduated 2008)
CMS Doctors and Clinicians data list 2008 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2023
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Shimamura has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Shimamura as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Valhalla and New York
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 65% of clinicians listed under Surgery in Valhalla, NY (2024, 13 clinicians with data). Median for this group: 118. Middle half: 56 to 194.
Fewer Medicare Part B services than 75% of clinicians listed under Surgery in New York (2024, 991 clinicians with data). Median for this group: 191. Middle half: 83 to 381.
Medicare-allowed amount
A higher Medicare-allowed amount than 80% of clinicians listed under Surgery in Valhalla, NY (2024, 13 clinicians with data). Median for this group: $12,512. Middle half: $5,361 to $25,713.
A higher Medicare-allowed amount than 70% of clinicians listed under Surgery in New York (2024, 991 clinicians with data). Median for this group: $24,272. Middle half: $9,849 to $54,064.
Paid by Medicare
A higher Medicare payment amount than 80% of clinicians listed under Surgery in Valhalla, NY (2024, 13 clinicians with data). Median for this group: $9,907. Middle half: $4,271 to $20,333.
A higher Medicare payment amount than 75% of clinicians listed under Surgery in New York (2024, 991 clinicians with data). Median for this group: $18,754. Middle half: $7,491 to $41,963.
26 active clinicians are listed under Surgery with a practice address in Valhalla, NY (2,058 in New York).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Valhalla
7.7% of these 26 clinicians have the CMS telehealth indicator.
73.1% of these 26 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
CMS data for Medicare Part B services are available for 2024 only.
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Medicare-allowed amount
CMS data for Medicare-allowed amount are available for 2024 only.
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Paid by Medicare
CMS data for Medicare payment amount are available for 2024 only.
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Industry payments (Open Payments)
Industry payments (Open Payments) increased 254% from $2,086.29 in 2023 to $7,377.13 in 2025.
- 2023: $2,086.29
- 2024: $2,654.31
- 2025: $7,377.13
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 โ December 31, 2025): 46 records totaling $7,377.13.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| TransMedics, Inc. |
Travel and Lodging
Cash or cash equivalent
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Organ Care System | General | $1,043.73 |
| Abbott Laboratories |
Travel and Lodging
In-kind items and services
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TRICLIP | General | $860.48 |
| TransMedics, Inc. |
Travel and Lodging
Cash or cash equivalent
|
Organ Care System | General | $576.60 |
| W. L. Gore & Associates, Inc. |
Travel and Lodging
In-kind items and services
|
GORE TAG Conformable Thoracic Endoprosthesis | General | $534.57 |
| ABIOMED |
Travel and Lodging
In-kind items and services
|
โ | General | $423.50 |
| Abbott Laboratories |
Travel and Lodging
In-kind items and services
|
TRICLIP | General | $394.70 |
| W. L. Gore & Associates, Inc. |
Travel and Lodging
In-kind items and services
|
Product in Development | General | $353.38 |
| W. L. Gore & Associates, Inc. |
Travel and Lodging
In-kind items and services
|
Product in Development | General | $335.81 |
| ABIOMED |
Travel and Lodging
Cash or cash equivalent
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โ | General | $300.50 |
| ABIOMED |
Travel and Lodging
In-kind items and services
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โ | General | $252.08 |
| AngioDynamics, Inc. |
Food and Beverage
In-kind items and services
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ANGIOVAC | General | $209.91 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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COREVALVE EVOLUT R | General | $185.66 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
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COREVALVE EVOLUT R | General | $181.69 |
| Medtronic, Inc. |
Food and Beverage
In-kind items and services
|
LIGASURE | General | $166.66 |
| W. L. Gore & Associates, Inc. |
Food and Beverage
In-kind items and services
|
Product in Development | General | $165.97 |
| ABIOMED |
Food and Beverage
In-kind items and services
|
โ | General | $150.00 |
| ABIOMED |
Food and Beverage
In-kind items and services
|
โ | General | $145.66 |
| W. L. Gore & Associates, Inc. |
Food and Beverage
In-kind items and services
|
Product in Development | General | $113.93 |
| W. L. Gore & Associates, Inc. |
Food and Beverage
In-kind items and services
|
Product in Development | General | $113.15 |
| Abbott Laboratories |
Travel and Lodging
In-kind items and services
|
TRICLIP | General | $100.47 |
| ABIOMED |
Food and Beverage
Cash or cash equivalent
|
โ | General | $66.30 |
| ABIOMED |
Food and Beverage
In-kind items and services
|
โ | General | $55.79 |
| ABIOMED |
Food and Beverage
In-kind items and services
|
โ | General | $55.73 |
| ABIOMED |
Food and Beverage
In-kind items and services
|
โ | General | $49.97 |
| ABIOMED |
Food and Beverage
In-kind items and services
|
โ | General | $40.00 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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33361
Replacement of aortic valve through the skin and femoral artery
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48 | 48 | $5270.00 | $881.34 |
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33533
Coronary artery bypass using artery graft, 1 graft
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16 | 16 | $8131.00 | $724.10 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2023-08-21NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - THORACIC SURGERY
I20230718000443
NY
8527428945
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Westchester Medical Center Advanced Physician Services Pc
95 Grasslands Rd, Valhalla, NY 105951652
Phone: 9144936940
Westchester Medical Center Advanced Physician Services Pc
100 Woods Rd, Valhalla, NY 105951530
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Thoracic Surgery (Cardiothoracic Vascular Surgery)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 100 WOODS RD, VALHALLA, NY 105951530 (Tel: 9144938381)
Surgery (license number reported to NPPES: NY 324555)
NPI status registered as active in NPPES database
Registered at 1364 CLIFTON RD, EMORY UNIVERSITY HOSPITAL, ATLANTA, GA 30322 (Tel: 4047229934)
Registered at 1767 NORTH DECATUR RD NE, UNIVERSITY INN AT EMORY UNIT 410, ATLANTA, GA 30307 (Tel: 6789204471)
Recorded as JUNICHI SHIMAMURA, M.D.
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Surgery Specialists in Valhalla
- Dr. Tareq Alqasas, MD
- Dr. Stuart Greenstein, MD
- Dr. Shan Huang, MD
- Dr. Maria Yan Wu, MD
- Dr. Thoi Ngo, MD
- Dr. Brian Welch, DO
Mailing Address
1767 North Decatur Rd Ne, University Inn At Emory Unit 410
Atlanta, GA 30307
Phone: 6789204471