Quick answers
- Which hospitals does Mark B. Lonstein work at?
- Medicare's official clinician data lists Mark B. Lonstein at 1 hospital: Sarasota Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark B. Lonstein see patients?
- Medicare's clinician data lists 1 practice location in Sarasota, FL. Call before your visit to confirm the address.
- What is Mark B. Lonstein's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Mark B. Lonstein accept Medicare assignment?
- Yes. Medicare's clinician data says Mark B. Lonstein 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 B. Lonstein?
- (941) 917-6500, as listed in official Medicare / NPI Registry data.
- What is Mark B. Lonstein's NPI number?
- 1891796173. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark B. Lonstein works
Medicare's Facility Affiliation Data lists Mark B. Lonstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Sarasota Memorial HospitalSarasota, FL · Acute Care Hospital · CCN 100087
Practice locations
Addresses where Mark B. Lonstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 2032 Hillview StSarasota, FL 34239 (941) 917‑6500
Group practices
Medicare enrollment lists Mark B. Lonstein as a member of this group (CMS data updated 2026-10-02).
- Mark B Lonstein MD PA2 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Sarasota
Clinicians with the same Medicare primary specialty in Sarasota, FL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 1981 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891796173 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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