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

Mark D. Horowitz MD PC

Organization Rheumatology Physician · NPI 1780988717

Mark D. Horowitz MD PC is a Rheumatology Physician in New York, New York. Registered with an NPI since 2011.

In the registry since
2011
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

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Practice location Address checks out

21 E 90th St
New York, NY 10128-0654
Phone: (212) 860-3077
Fax: (212) 410-7410
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X

Record details

NPI number1780988717
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Horowitz — President · (212) 860-3077
NPI enumeratedJanuary 5, 2011
Last updated in NPPESJanuary 5, 2011
Mailing address21 E 90th St, New York, NY 10128-0654

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