IAN M FRANKFORT MD, STUART RUBIN MD AND DANIEL J MCMAHON MD
IAN M FRANKFORT MD, STUART RUBIN MD AND DANIEL J MCMAHON MD is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1609984780, based in Williamsville, NY. The organization lists 2 taxonomy classifications, with Family Medicine Physician recorded as primary.
Getting there
The practice address on file is 747 HOPKINS RD, Williamsville, NY 14221. 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 |
|---|---|---|
| 120885 | NY | Family Medicine Physician primary |
| 116558 | NY | Family Medicine Physician |
| 117197 | NY | Family Medicine Physician |
| F3002291 | NY | Adult Health Nurse Practitioner |
This provider holds licence 120885 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 Family Medicine covers
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity. NUCC Health Care Provider Taxonomy, code 207Q00000X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207Q00000X | Family Medicine Physician | 120885 | NY | primary |
| 207Q00000X | Family Medicine Physician | 116558 | NY | |
| 207Q00000X | Family Medicine Physician | 117197 | NY | |
| 363LA2200X | Adult Health Nurse Practitioner Adult Health | F3002291 | 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 | 1609984780 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Aug 28, 2006 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Practice address |
747 HOPKINS RD Williamsville, NY 14221 (716) 688-5132 Fax (716) 688-3022 |
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 | 9 | 8 | 4 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 0 | 9 | 9 | 8 | 8 | 7 | 7 |
Sum = 80 · next multiple of 10 = 80 · check digit = 0 · actual last digit = 0
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.