Quick answers
- Which hospitals does John M. Allen work at?
- Medicare's official clinician data lists John M. Allen at 3 hospitals: Lake Health, UH Cleveland Medical Center and UH Regional Hospitals. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John M. Allen see patients?
- Medicare's clinician data lists 1 practice location in Mentor, OH. Call before your visit to confirm the address.
- What is John M. Allen's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does John M. Allen accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Allen 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 John M. Allen's NPI number?
- 1215514815. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John M. Allen works
Medicare's Facility Affiliation Data lists John M. Allen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Lake HealthConcord, OH · Acute Care Hospital · CCN 360098
- UH Cleveland Medical CenterCleveland, OH · Acute Care Hospital · CCN 360137
- UH Regional HospitalsChardon, OH · Acute Care Hospital · CCN 360075
Practice locations
Addresses where John M. Allen is enrolled with Medicare (CMS data updated 2026-10-02).
- 9500 Mentor Ave, Suite 100Mentor, OH 44060
Group practices
Medicare enrollment lists John M. Allen as a member of this group (CMS data updated 2026-10-02).
- Lake Hospital System, Inc.92 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Mentor
Clinicians with the same Medicare primary specialty in Mentor, OH — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Ohio University, College Of Osteopathic Medicine |
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215514815 |
| 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