DR JOSEPH GREER AND DR MITCHEL CHARNAS
DR JOSEPH GREER AND DR MITCHEL CHARNAS is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1699764753, based in New York, NY. The organization lists 5 taxonomy classifications, with Dental Hygienist recorded as primary.
Getting there
The practice address on file is 200 MADISON AVENUE SUITE 2201, New York, NY 10128. 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 |
|---|---|---|
| 293308 | NY | Dental Hygienist primary |
| 032885-3 | NY | Endodontics |
| 024929-1 | NY | General Practice Dentistry |
| 036100-1 | NY | General Practice Dentistry |
| 044865-1 | NY | General Practice Dentistry |
| 051906-1 | NY | General Practice Dentistry |
| 042115 | NY | Periodontics |
| 050487 | NY | Oral and Maxillofacial Surgery (Dentist) |
This provider holds licence 293308 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 Dental Hygienist covers
An individual who has completed an accredited dental hygiene education program, and an individual who has been licensed by a state board of dental examiners to provide preventive care services under the supervision of a dentist. Functions that may be legally delegated to the dental hygienist vary based on the needs of the dentist, the educational preparation of the dental hygienist and state dental practice acts and regulations, but always include, at a minimum, scaling and polishing the teeth. To avoid misleading the public, no occupational title other than dental hygienist should be used to describe this dental auxiliary. NUCC Health Care Provider Taxonomy, code 124Q00000X
All registered taxonomy codes
This provider registers 8 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 124Q00000X | Dental Hygienist | 293308 | NY | primary |
| 1223E0200X | Endodontics Endodontics | 032885-3 | NY | |
| 1223G0001X | General Practice Dentistry General Practice | 024929-1 | NY | |
| 1223G0001X | General Practice Dentistry General Practice | 036100-1 | NY | |
| 1223G0001X | General Practice Dentistry General Practice | 044865-1 | NY | |
| 1223G0001X | General Practice Dentistry General Practice | 051906-1 | NY | |
| 1223P0300X | Periodontics Periodontics | 042115 | NY | |
| 1223S0112X | Oral and Maxillofacial Surgery (Dentist) Oral and Maxillofacial Surgery | 050487 | 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 | 1699764753 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Oct 20, 2005 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Practice address |
200 MADISON AVENUE SUITE 2201 New York, NY 10128 (212) 683-2530 Fax (212) 684-7162 |
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 | 9 | 9 | 7 | 6 | 4 | 7 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 6 | 9 | 9 | 5 | 6 | 8 | 7 | 1 |
Sum = 77 · next multiple of 10 = 80 · 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.