Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mara Harmelin Horwitz, MD

Individual provider Pediatric Rheumatology Physician · NPI 1649613332

Dr. Mara Harmelin Horwitz, MD is a Rheumatology in Saint Louis, Missouri. Graduated from Southern Illinois University School of Medicine in 2013, 13 years ago. Practices with Multicare Health System, a 2,302-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
13
Trained at
Southern Illinois University School of Medicine
Licensed in
MO
In the registry since
2013
Specialties on file
3
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

1225 S Grand Blvd
Saint Louis, MO 63104-1016
Phone: (314) 977-8833
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence 2016009340 (MO)
Pediatric Rheumatology Physician Taxonomy 2080P0216X · Licence 2016009340 (MO)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1649613332
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 11, 2013
Last updated in NPPESFebruary 5, 2021
Certification dateFebruary 5, 2021

Medicare enrollment

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

Medicare specialtyRHEUMATOLOGY
Also practisesPEDIATRIC MEDICINE
Medical schoolSOUTHERN ILLINOIS UNIVERSITY SCHOOL OF MEDICINE
Graduated 2013 (13 years in practice)
Group practice Multicare Health System — 2302 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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