Quick answers
- Does Harry H. Tsou accept Medicare assignment?
- Yes. Medicare's clinician data says Harry H. Tsou accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Harry H. Tsou see?
- In 2024, CMS data shows 144 Original Medicare patients and 1,349 services for Harry H. Tsou. This counts Original Medicare only and measures volume, not quality.
- What is Harry H. Tsou's NPI number?
- 1598792632. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Harry H. Tsou, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 144 |
|---|---|
| Services billed to Medicare | 1,349 |
| Different services or procedures | 39 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Ultrasound study of arm or leg veins with compression and maneuvers (93970)54 services
- Ultrasound of leg arteries or artery grafts (93925)43 services
- Ultrasound of one leg arteries or artery grafts (93926)36 services
- Removal of plaque in artery of leg, initial vessel (37229)32 services
- Review by radiologist of arm or leg artery image (75710)32 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes75%
- Arthritis65%
- Ischemic heart disease58%
- Depression44%
Practice locations
Addresses where Harry H. Tsou is enrolled with Medicare (CMS data updated October 2, 2026).
- 2103 Deer Park Ave, Suite 200Deer Park, NY 11729 (631) 574‑2060
- 385 W Sunrise HwyFreeport, NY 11520 (631) 574‑2060
Group practices
Medicare enrollment lists Harry H. Tsou as a member of this group (CMS data updated October 2, 2026).
- Mark Medical Care PLLC8 clinicians in the group
Specialties
- Interventional Radiologyprimary
- Diagnostic Radiologyalso
Other interventional radiologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Other clinicians in Mark Medical Care PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Icahn School Of Medicine At Mount Sinai |
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1598792632 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians