Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Marilyn Althoff, MD

Individual provider Emergency Medicine Physician · NPI 1013966217

Dr. Marilyn Althoff, MD practises Emergency Medicine in Morristown, New Jersey. Graduated from University of Maryland School of Medicine in 1986, 40 years ago. Practices with Morristown Emergency Medical Associates LLC, a 81-clinician group and accepts Medicare assignment. Licensed in New Jersey.

Years since qualifying
40
Trained at
University of Maryland School of Medicine
Licensed in
NJ
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

100 Madison Ave
Morristown, NJ 07960-6136
Phone: (800) 290-5309
Fax: (803) 434-4354
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence MA54593 (NJ)

Record details

NPI number1013966217
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 8, 2006
Last updated in NPPESJuly 13, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF MARYLAND SCHOOL OF MEDICINE
Graduated 1986 (40 years in practice)
Group practice Morristown Emergency Medical Associates Llc — 81 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients508
Services billed 564 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Morristown Medical Center Hospital · Morristown, NJ

Colleagues at Morristown Emergency Medical Associates LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 81 clinicians in the practice; 12 are shown here.

Other providers in Morristown