Quick answers
- Which hospitals does Louis M. Day work at?
- Medicare's official clinician data lists Louis M. Day at 3 hospitals: Hackensack Meridian Mountainside Medical, St Joseph's University Medical Center Inc and Valley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Louis M. Day see patients?
- Medicare's clinician data lists 1 practice location in Montclair, NJ. Call before your visit to confirm the address.
- What is Louis M. Day's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Louis M. Day accept Medicare assignment?
- Yes. Medicare's clinician data says Louis M. Day 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 Louis M. Day?
- (201) 490-4333, as listed in official Medicare / NPI Registry data.
- What is Louis M. Day's NPI number?
- 1922532647. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Louis M. Day works
Medicare's Facility Affiliation Data lists Louis M. Day at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Hackensack Meridian Mountainside MedicalMontclair, NJ · Acute Care Hospital · CCN 310054
- St Joseph's University Medical Center IncPaterson, NJ · Acute Care Hospital · CCN 310019
- Valley HospitalParamus, NJ · Acute Care Hospital · CCN 310012
Practice locations
Addresses where Louis M. Day is enrolled with Medicare (CMS data updated 2026-10-02).
- 120 Valley Rd, Suite 100Montclair, NJ 07042 (201) 490‑4333
Group practices
Medicare enrollment lists Louis M. Day as a member of this group (CMS data updated 2026-10-02).
- Bellapianta Orthopaedics and Sports Medicine LLC7 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Montclair
Clinicians with the same Medicare primary specialty in Montclair, NJ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 2017 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922532647 |
| 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