Quick answers
- Which hospitals does Mark A. Lapp work at?
- Medicare's official clinician data lists Mark A. Lapp at 2 hospitals: Emerson Hospital - and Lowell General Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark A. Lapp see patients?
- Medicare's clinician data lists 2 practice locations, including North Chelmsford, MA and Salem, NH. Call before your visit to confirm the address.
- What is Mark A. Lapp's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Mark A. Lapp accept Medicare assignment?
- Yes. Medicare's clinician data says Mark A. Lapp 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.
- Does Mark A. Lapp offer telehealth?
- Medicare's clinician data says Mark A. Lapp offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark A. Lapp?
- (978) 454-0706, as listed in official Medicare / NPI Registry data.
- What is Mark A. Lapp's NPI number?
- 1881664977. 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 A. Lapp works
Medicare's Facility Affiliation Data lists Mark A. Lapp at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Emerson Hospital -W Concord, MA · Acute Care Hospital · CCN 220084
- Lowell General HospitalLowell, MA · Acute Care Hospital · CCN 220063
Practice locations
Addresses where Mark A. Lapp is enrolled with Medicare (CMS data updated 2026-10-02).
- 14 Research PlNorth Chelmsford, MA 01863 (978) 454‑0706
- 23 Keewaydin DrSalem, NH 03079 (603) 386‑0272
Group practices
Medicare enrollment lists Mark A. Lapp as a member of this group (CMS data updated 2026-10-02).
- Orthopaedic Surgical Associates of Lowell, P.C.43 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in North Chelmsford
Clinicians with the same Medicare primary specialty in North Chelmsford, MA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York At Stony Brook, School Of Medicine |
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1881664977 |
| 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