Karleung Siu, M.D.
Karleung Siu, M.D. is a Hematology (Internal Medicine) Physician in Teaneck, NJ, registered under NPI 1649417437. This provider registers 4 separate taxonomy codes, which usually means they practise across more than one recognised specialty. 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 718 TEANECK RD REGIONAL CANCER CENTER, Teaneck, NJ 07666. 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 |
|---|---|---|
| 25MA09153700 | NJ | Hematology (Internal Medicine) Physician primary |
| 247704 | NJ | Hospice and Palliative Medicine (Internal… |
| 247704 | NY | Hematology & Oncology Physician |
| 25MA091537001 | NJ | Hematology & Oncology Physician |
| 247704 | NY | Internal Medicine Physician |
Licences are recorded in 2 states: NJ, NY. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Hematology/oncology
- PAC ID
- 9931358827
- Enrollment ID
- I20121010000021
Medicare enrolment is recorded as approved under the provider type Practitioner - Hematology/oncology. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: New Jersey and New York. The practice address on file is in Teaneck, NJ, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 25MA09153700
- Specialty
- Hematology (Internal Medicine) Physician
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
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
All registered taxonomy codes
This provider registers 5 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RH0000X | Hematology (Internal Medicine) Physician Hematology | 25MA09153700 | NJ | primary |
| 207RH0002X | Hospice and Palliative Medicine (Internal Medicine) Physician Hospice and Palliative Medicine | 247704 | NJ | |
| 207RH0003X | Hematology & Oncology Physician Hematology & Oncology | 247704 | NY | |
| 207RH0003X | Hematology & Oncology Physician Hematology & Oncology | 25MA091537001 | NJ | |
| 207R00000X | Internal Medicine Physician | 247704 | NY |
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 | 1649417437 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jan 15, 2009 |
| Last updated | Dec 6, 2024 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | M.D. |
| Practice address |
718 TEANECK RD REGIONAL CANCER CENTER Teaneck, NJ 07666 (201) 227-6008 Fax (201) 227-6008 |
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 | 4 | 9 | 4 | 1 | 7 | 4 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 8 | 9 | 8 | 1 | 5 | 4 | 6 |
Sum = 73 · next multiple of 10 = 80 · check digit = 7 · actual last digit = 7
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.