Quick answers
- Where does Mark D. Sethna see patients?
- Medicare's clinician data lists 2 practice locations, including Long Island City, NY. Call before your visit to confirm the address.
- What is Mark D. Sethna's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Mark D. Sethna accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Sethna 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 D. Sethna?
- (718) 361-6266, as listed in official Medicare / NPI Registry data.
- What is Mark D. Sethna's NPI number?
- 1144251729. 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 D. Sethna is enrolled with Medicare (CMS data updated 2026-10-02).
- 1029 41st AveLong Island City, NY 11101 (718) 361‑6266
- 2101 41st AveLong Island City, NY 11101
Group practices
Medicare enrollment lists Mark D. Sethna as a member of this group (CMS data updated 2026-10-02).
- The Floating Hospital Inc19 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Long Island City
Clinicians with the same Medicare primary specialty in Long Island City, NY — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | New York College Of Osteo Medicine Of New York Institute Of Technology |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144251729 |
| 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