Quick answers
- Which hospitals does Mark D. Johnson work at?
- Medicare's official clinician data lists Mark D. Johnson at 4 hospitals: Milford Regional Medical Center, UMass Memorial Health - Harrington Hospital, UMass Memorial Healthalliance Hospitals and UMass Memorial Medical Center/University Campus. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark D. Johnson see patients?
- Medicare's clinician data lists 1 practice location in Worcester, MA. Call before your visit to confirm the address.
- What is Mark D. Johnson's specialty?
- Medicare lists Neurosurgery as the primary specialty.
- Does Mark D. Johnson accept Medicare assignment?
- Yes. Medicare's clinician data says Mark D. Johnson 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 D. Johnson offer telehealth?
- Medicare's clinician data says Mark D. Johnson offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark D. Johnson?
- (508) 334-1000, as listed in official Medicare / NPI Registry data.
- What is Mark D. Johnson's NPI number?
- 1578501797. 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 D. Johnson works
Medicare's Facility Affiliation Data lists Mark D. Johnson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Milford Regional Medical CenterMilford, MA · Acute Care Hospital · CCN 220090
- UMass Memorial Health - Harrington HospitalSouthbridge, MA · Acute Care Hospital · CCN 220019
- UMass Memorial Healthalliance HospitalsLeominster, MA · Acute Care Hospital · CCN 220001
- UMass Memorial Medical Center/University CampusWorcester, MA · Acute Care Hospital · CCN 220163
Practice locations
Addresses where Mark D. Johnson is enrolled with Medicare (CMS data updated 2026-10-02).
- 55 Lake Ave NWorcester, MA 01655 (508) 334‑1000
Group practices
Medicare enrollment lists Mark D. Johnson as a member of this group (CMS data updated 2026-10-02).
- UMass Memorial Medical Group Inc2,516 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in Worcester
Clinicians with the same Medicare primary specialty in Worcester, MA — not a recommendation.
Clinician information
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1578501797 |
| 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