Leonardo Sirulnik, MD PHD
Leonardo Sirulnik, MD PHD is a Hematology & Oncology Physician in Irvington, NY, registered under NPI 1104894518. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 19 MATTHIESSEN PARK S, Irvington, NY 10533. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 287353 | NY | Hematology & Oncology Physician primary |
This provider holds licence 287353 issued in NY. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Hematology & Oncology covers
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered. NUCC Health Care Provider Taxonomy, code 207RH0003X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1104894518 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Mar 10, 2006 |
| Last updated | May 22, 2026 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | MD PHD |
| Practice address |
19 MATTHIESSEN PARK S Irvington, NY 10533 (617) 953-9329 Fax (914) 840-1435 |
| Other identifiers |
219615
· TUFTS AA2027 · HPHC 2025906 · MASSHEALTH 80313 · FALLON COMMUNITY HEALTH P 3600312 · UNITED HEALTH CARE 3364563 · AETNA US HEALTHCARE 4107454 · CIGNA |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 1 | 0 | 4 | 8 | 9 | 4 | 5 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 0 | 4 | 7 | 9 | 8 | 5 | 2 |
Sum = 62 · next multiple of 10 = 70 · check digit = 8 · actual last digit = 8
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.