Laszlo Leb, MD
Laszlo Leb, MD is a Hematology (Internal Medicine) Physician in Worcester, MA, registered under NPI 1609857903.
Getting there
The practice address on file is 20 WORCESTER CENTER BLVD, Worcester, MA 01608. 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 |
|---|---|---|
| 40628 | MA | Hematology (Internal Medicine) Physician primary |
This provider holds licence 40628 issued in MA. 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 covers
An internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, clotting disorders, sickle cell disease, hemophilia, leukemia and lymphoma. NUCC Health Care Provider Taxonomy, code 207RH0000X
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 | 1609857903 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 14, 2005 |
| Last updated | May 3, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
20 WORCESTER CENTER BLVD Worcester, MA 01608 (508) 368-3168 Fax (508) 368-3166 |
| Mailing address |
630 PLANTATION ST WOT 12TH FL ATTN: PHYSICIAN SERVICES Worcester, MA 01605 |
| Other identifiers |
784228
· Other 9900270 · Other N01713 · Other 040628 · Other N01713 · Other 04-2472266 · Other 042472266 · Other 1266084 · Other 04-2472266 · Other 27530 · Other AA3714 · Other 042472266 · Other 4385559 · Other 042472266 · Other 1060864 · Other 830005042 · Other N01713 · Other 27530 · Other |
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 | 6 | 0 | 9 | 8 | 5 | 7 | 9 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 0 | 9 | 7 | 5 | 5 | 9 | 0 |
Sum = 67 · next multiple of 10 = 70 · check digit = 3 · actual last digit = 3
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.