Gretchen Chan, FNP
Gretchen Chan, FNP is a Family Nurse Practitioner in Eastchester, NY, registered under NPI 1538645957. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 375 WHITE PLAINS RD, Eastchester, NY 10709. 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 |
|---|---|---|
| 354799 | NY | Family Nurse Practitioner primary |
| SP032176 | PA | Family Medicine Physician |
| A167963 | IA | Family Medicine Physician |
| 95024282 | CA | Family Medicine Physician |
| 278738 | AZ | Family Medicine Physician |
| 26NJ01310400 | NJ | Family Medicine Physician |
| NP200006280 | DC | Family Medicine Physician |
| AP137862 | TX | Family Nurse Practitioner |
| 857507 | NV | Family Medicine Physician |
| C-APN-0002065-C-NP | CO | Family Medicine Physician |
| 53-80701-061 | KS | Family Medicine Physician |
| 5022731 | NC | Family Medicine Physician |
| AP61350350 | WA | Family Medicine Physician |
| 10824 | CT | Family Medicine Physician |
| 113869 | NE | Family Medicine Physician |
Licences are recorded in 15 states: NY, PA, IA, CA, AZ, NJ, DC, TX, NV, CO, KS, NC, WA, CT, NE. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Nurse Practitioner
- PAC ID
- 6800140591
Enrolled in Medicare 12 times, across 12 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| Texas | I20181115001998 | Practitioner - Nurse Practitioner |
| New Jersey | I20240528001458 | Practitioner - Nurse Practitioner |
| Nebraska | I20240530002305 | Practitioner - Nurse Practitioner |
| Iowa | I20240530002402 | Practitioner - Nurse Practitioner |
| Connecticut | I20240613002047 | Practitioner - Nurse Practitioner |
| Arizona | I20240620003469 | Practitioner - Nurse Practitioner |
| Ohio | I20240626003529 | Practitioner - Nurse Practitioner |
| New York | I20240724003999 | Practitioner - Nurse Practitioner |
| Washington | I20240801003125 | Practitioner - Nurse Practitioner |
| California | I20240830001275 | Practitioner - Nurse Practitioner |
| North Carolina | I20251010000065 | Practitioner - Nurse Practitioner |
| Pennsylvania | I20251120001993 | Practitioner - Nurse Practitioner |
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. There are 12 separate enrolment records across 12 states (TX, NJ, NE, IA, CT, AZ, OH, NY, WA, CA, NC, PA). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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 15 states
This provider holds licences in 15 states: Arizona, California, Colorado, Connecticut, District of Columbia, Iowa, Kansas, North Carolina, Nebraska, New Jersey, Nevada, New York, Pennsylvania, Texas and Washington. The practice address on file is in Eastchester, NY, 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
- NP200006280
- Specialty
- Family Medicine Physician
- Licence
- 354799
- Specialty
- Family Nurse Practitioner
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 Family covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LF0000X
All registered taxonomy codes
This provider registers 15 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 363LF0000X | Family Nurse Practitioner Family | 354799 | NY | primary |
| 207Q00000X | Family Medicine Physician | SP032176 | PA | |
| 207Q00000X | Family Medicine Physician | A167963 | IA | |
| 207Q00000X | Family Medicine Physician | 95024282 | CA | |
| 207Q00000X | Family Medicine Physician | 278738 | AZ | |
| 207Q00000X | Family Medicine Physician | 26NJ01310400 | NJ | |
| 207Q00000X | Family Medicine Physician | NP200006280 | DC | |
| 363LF0000X | Family Nurse Practitioner Family | AP137862 | TX | |
| 207Q00000X | Family Medicine Physician | 857507 | NV | |
| 207Q00000X | Family Medicine Physician | C-APN-0002065-C-NP | CO | |
| 207Q00000X | Family Medicine Physician | 53-80701-061 | KS | |
| 207Q00000X | Family Medicine Physician | 5022731 | NC | |
| 207Q00000X | Family Medicine Physician | AP61350350 | WA | |
| 207Q00000X | Family Medicine Physician | 10824 | CT | |
| 207Q00000X | Family Medicine Physician | 113869 | NE |
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 | 1538645957 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 18, 2018 |
| Last updated | Oct 21, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | FNP |
| Practice address |
375 WHITE PLAINS RD Eastchester, NY 10709 (512) 324-4780 |
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 | 5 | 3 | 8 | 6 | 4 | 5 | 9 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 6 | 8 | 3 | 4 | 1 | 9 | 1 |
Sum = 63 · next multiple of 10 = 70 · 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.