Medical emergency?Emergency? Call 911. Nearest emergency roomsNearest ERs

Internal Medicine

Claire N. Grigaux, MD

Works at hospitals in Pompton Plains, NJ · Montclair, NJ · Morristown, NJ … · New Jersey

Summary

Dr. Claire N. Grigaux, MD is an internal medicine doctor at 100 Madison Ave, Morristown, NJ 07960. Phone: (973) 971-5596. Accepts Medicare assignment. In 2024, Claire N. Grigaux had 295 Original Medicare patients and 2,817 services. NPI 1992883557. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

From official Medicare data

This page shows what Medicare's official clinician data says about Claire N. Grigaux, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Claire N. Grigaux accept Medicare assignment?
Yes. Medicare's clinician data says Claire N. Grigaux accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
How many Medicare patients does Claire N. Grigaux see?
In 2024, CMS data shows 295 Original Medicare patients and 2,817 services for Claire N. Grigaux. This counts Original Medicare only and measures volume, not quality.
What is Claire N. Grigaux's NPI number?
1992883557. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Medicare activity in 2024

Official CMS public-use data for Claire N. Grigaux, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Original Medicare patients295
Services billed to Medicare2,817
Different services or procedures28
Participating Medicare providerYes
Average age of these patients57

Most frequent services

  1. Injection, denosumab, 1 mg (J0897)1,200 services
  2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)479 services
  3. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)231 services
  4. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)194 services
  5. Administration of influenza virus vaccine (G0008)131 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

  • High cholesterol61%
  • High blood pressure49%
  • Anxiety35%
  • Diabetes23%
  • Osteoporosis20%
  • Depression18%

Hospitals where Claire N. Grigaux works

Medicare's Facility Affiliation Data lists Claire N. Grigaux at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

Practice locations

Addresses where Claire N. Grigaux is enrolled with Medicare (CMS data updated October 2, 2026).

Group practices

Medicare enrollment lists Claire N. Grigaux as a member of this group (CMS data updated October 2, 2026).

  • Practice Associates Medical Group1,408 clinicians in the group

Specialties

Find other Internal Medicine doctors in New Jersey →

Other internal medicine doctors in Morristown

Clinicians with the same Medicare primary specialty in Morristown, NJ — not a recommendation.

All internal medicine doctors in Morristown →

Other clinicians in Practice Associates Medical Group

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Medical schoolState University Of Ny Upstate Medical University
Graduation year1998 (28 years since medical school)
Gender (as listed)Female
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1992883557
CorrectionsReport 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

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians