Anthony Kwan, MD
Anthony Kwan, MD is an Emergency Medicine Physician in Port Jefferson, NY, registered under NPI 1003312802.
Getting there
Here is what surrounds this office in Port Jefferson, based on OpenStreetMap data collected Sep 18, 2026. Parking is available about 0.35 mi away. The nearest transit stop is 0.26 mi away. If you arrive early, there is a coffee shop 0.38 mi away.
Getting here and what is nearby
Transit 518 ft ~2 min
Parking 0.21 mi ~5 min
Parking 0.25 mi ~5 min
Transit 0.26 mi ~6 min
Restaurant Tiger Lily Cafe 0.32 mi ~7 min
Restaurant Pasta Pasta 0.33 mi ~7 min
Parking 0.35 mi ~7 min
Restaurant Revival by Toast 0.35 mi ~7 min
Grocery The Amazing Olive 0.37 mi ~8 min
Coffee Starbucks 0.38 mi ~8 min
Convenience The Port Shop 0.40 mi ~9 min
Hotel Danfords Hotel, Marina & Spa 0.42 mi ~9 min
25 East Broadway, Port Jefferson 11777
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 308847 | NY | Emergency Medicine Physician primary |
This provider holds licence 308847 issued in NY. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Emergency Medicine
- PAC ID
- 7416284021
- Enrollment ID
- I20211020000360
Medicare enrolment is recorded as approved under the provider type Practitioner - Emergency Medicine. 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.
What Emergency Medicine covers
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury. NUCC Health Care Provider Taxonomy, code 207P00000X
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 | 1003312802 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 2, 2018 |
| Last updated | Nov 22, 2022 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | MD |
| Practice address |
200 BELLE TERRE RD Port Jefferson, NY 11777 (631) 474-6791 |
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 | 0 | 0 | 3 | 3 | 1 | 2 | 8 | 0 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 6 | 1 | 4 | 8 | 0 |
Sum = 48 · next multiple of 10 = 50 · 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.