Louis Marcel Day, M.D.
Orthopaedic Surgery Physician · Montclair, NJ
Louis Marcel Day, M.D. is an orthopaedic surgery physician with a practice address in Montclair, New Jersey, and NPI 1922532647, issued on Apr 19, 2017. Check the license (New Jersey 25MA11976900, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Louis Marcel Day
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- 25MA11976900 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 120 Valley RD, Montclair, NJ 07042
- Phone
- (201) 490-4333
- Enumerated
- Apr 19, 2017
- Record last updated
- Dec 5, 2024
- Medicare enrollment
- Enrolled (PECOS I20231003000369); accepts Medicare assignment
- Medical or professional school
- State University Of New York Downstate Medical Center, 2017
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 690 in New Jersey → Look up another NPI →
Also registered at 120 Valley RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Barbara Hannan, PAPhysician Assistant1326710914
- Michelle IngaPhysician Assistant1003372988
Verify Louis Marcel Day in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA11976900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
97 Medicare Part D claims for 54 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 18 claims were for opioids.
Most prescribed
- Diclofenac Sodium53 claims
- Gabapentin11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $293.12
7 payments; by number, the most common kind was food and beverage; the largest payer was Seapearl East, Inc. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Bellapianta Orthopaedics And Sports Medicine LLCMontclair, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Louis Marcel Day among 690 orthopaedic surgery physician records in New Jersey
Louis Marcel Day, M.D. is one of 690 orthopaedic surgery physician records with a practice address in New Jersey. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 90% of them.
- NPI issued2017 · 90% of these records are older, 7% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2017 · median 2001 among the 444 with a school on file
- Record last updated2024 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in New Jersey
There are 690 orthopaedic surgery physician records in New Jersey.
All 690 in New Jersey → Every provider in Montclair → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Joseph Bellapianta, MDMontclair, NJ 070421588823165
- Siddharth Mahure, MD, MBAMontclair, NJ 070421346696499
- John Mendes, M.D.Montclair, NJ 070421558434803
- Cornelius Nicoll, M.D.Montclair, NJ 070421548364581
- Gary Rombough, MDMontclair, NJ 070421700860509
- Jerald Vizzone, D.O.Montclair, NJ 070421861617623
- William Vonroth, MDMontclair, NJ 070421215902317
- Howard Blank, MDMillburn, NJ 070411992763999
Common questions
What is Louis Marcel Day, M.D.'s NPI number?
Louis Marcel Day, M.D.'s National Provider Identifier (NPI) is 1922532647, issued on Apr 19, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Louis Marcel Day, M.D. located?
The NPPES record lists a practice address at 120 Valley RD, Montclair, NJ, 07042. Phone: (201) 490-4333. Providers update this record themselves, so call before visiting.
How can I verify Louis Marcel Day, M.D.'s license?
NPPES lists New Jersey license number 25MA11976900, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Louis Marcel Day, M.D. prescribe under Medicare Part D?
In 2024, Louis Marcel Day, M.D. had 97 Medicare Part D claims for 54 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.