ALEXANDER S ELFENBEIN PHYSICIAN PC
ALEXANDER S ELFENBEIN PHYSICIAN PC is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1801968912, based in Valley Stream, NY. The organization lists 3 taxonomy classifications, with Cardiovascular Disease Physician recorded as primary.
Getting there
The practice address on file is 40 EAST MERRICK ROAD STE 104, Valley Stream, NY 11580. 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 |
|---|---|---|
| 1637251 | NY | Cardiovascular Disease Physician primary |
| 1637251 | NY | Internal Medicine Physician |
| 1637251 | NY | Geriatric Medicine (Internal Medicine)… |
This provider holds licence 1637251 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 Cardiovascular Disease covers
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms. NUCC Health Care Provider Taxonomy, code 207RC0000X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RC0000X | Cardiovascular Disease Physician Cardiovascular Disease | 1637251 | NY | primary |
| 207R00000X | Internal Medicine Physician | 1637251 | NY | |
| 207RG0300X | Geriatric Medicine (Internal Medicine) Physician Geriatric Medicine | 1637251 | 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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1801968912 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Nov 14, 2006 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Practice address |
40 EAST MERRICK ROAD STE 104 Valley Stream, NY 11580 (516) 568-2121 Fax (516) 568-0426 |
| Other identifiers |
01063809
· Medicaid (NY) |
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 | 8 | 0 | 1 | 9 | 6 | 8 | 9 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 0 | 1 | 9 | 6 | 7 | 9 | 2 |
Sum = 68 · next multiple of 10 = 70 · check digit = 2 · actual last digit = 2
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.