Quick answers
- Where does Mark A. Fellows see patients?
- Medicare's clinician data lists 1 practice location in Northport, NY. Call before your visit to confirm the address.
- What is Mark A. Fellows's specialty?
- Medicare lists Physical Therapist in Private Practice as the primary specialty.
- Does Mark A. Fellows accept Medicare assignment?
- Yes. Medicare's clinician data says Mark A. Fellows accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark A. Fellows?
- (631) 261-7200, as listed in official Medicare / NPI Registry data.
- What is Mark A. Fellows's NPI number?
- 1629226972. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mark A. Fellows is enrolled with Medicare (CMS data updated 2026-10-02).
- 505 Main StNorthport, NY 11768 (631) 261‑7200
Group practices
Medicare enrollment lists Mark A. Fellows as a member of this group (CMS data updated 2026-10-02).
- Visiting Nurse Service and Hospice of Suffolk Inc.9 clinicians in the group
Specialties
Find other clinicians: Physical Therapist in Private Practice, New York →
Other physical therapists in Northport
Clinicians with the same Medicare primary specialty in Northport, NY — not a recommendation.
Clinician information
| Credential | PT |
|---|---|
| Graduation year | 1990 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1629226972 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians