Benjamin Felder, DO
Benjamin Felder, DO is an Internal Medicine Physician in Oceanside, NY, registered under NPI 1003261041. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Oceanside, based on OpenStreetMap data collected Sep 14, 2026. Parking is available about 400 ft away. The nearest transit stop is 970 ft away, served by Merrick Road & Rockville Centre Parkway. A pharmacy sits 487 ft from the entrance (CVS Pharmacy), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.24 mi away.
Getting here and what is nearby
Parking 151 ft ~1 min
Parking 243 ft ~1 min
Restaurant Subway 242 ft ~1 min
604 Merrick Road, Rockville Centre 11570
08:00-21:00
Transit Merrick Road & Oceanside Road 409 ft ~2 min
Parking 400 ft ~2 min
Restaurant Bonbino 424 ft ~2 min
Merrick Road
Transit Merrick Road & North Oceanside Road 476 ft ~2 min
Pharmacy CVS Pharmacy 487 ft ~2 min
Restaurant Dunkin' Donuts 583 ft ~3 min
574 Merrick Road, Rockville Centre 11570
Mo 05:00-21:00; Tu 05:00-19:00; We-Fr 05:00-21:00; Sa-Su 07:00-21:00
Transit Merrick Road & Rockville Centre Parkway 970 ft ~4 min
Coffee Bagel Boss Cafe 0.24 mi ~5 min
Merrick Road, Oceanside
Gas station Exxon 0.24 mi ~5 min
Convenience Speedway 0.26 mi ~6 min
Gas station Speedway 0.26 mi ~6 min
Convenience 7-Eleven 0.37 mi ~8 min
Hotel Ramada 0.45 mi ~10 min
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 |
|---|---|---|
| 316981 | NY | Hospitalist Physician |
| 316981 | NY | Internal Medicine Physician primary |
This provider holds licence 316981 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 - Internal Medicine
- PAC ID
- 8628308509
- Enrollment ID
- I20220921001783
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal 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 Internal Medicine covers
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs. NUCC Health Care Provider Taxonomy, code 207R00000X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 208M00000X | Hospitalist Physician | 316981 | NY | |
| 207R00000X | Internal Medicine Physician | 316981 | NY | primary |
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 | 1003261041 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Apr 27, 2016 |
| Last updated | Aug 1, 2023 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | DO |
| Practice address |
1 HEALTHY WAY Oceanside, NY 11572 (516) 632-3666 |
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 | 2 | 6 | 1 | 0 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 4 | 6 | 2 | 0 | 8 |
Sum = 49 · next multiple of 10 = 50 · check digit = 1 · actual last digit = 1
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.