Mark D. Horowitz MD PC
NPI 1780988717 · Rheumatology Physician · New York, NY
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark D. Horowitz MD PC is a Rheumatology Physician organization in New York, NY (NPI 1780988717).
Provider details
- NPI number
- 1780988717
- Entity type
- Organization
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mark Horowitz, President(212) 860-3077
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-01-05
- Last updated
- 2011-01-05
Frequently asked questions
- What is Mark D. Horowitz MD PC's NPI number?
- Mark D. Horowitz MD PC's National Provider Identifier (NPI) is 1780988717, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark D. Horowitz MD PC?
- Mark D. Horowitz MD PC is classified in the NPPES registry as Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark D. Horowitz MD PC located?
- Mark D. Horowitz MD PC's practice location on file with NPPES is 21 E 90th St, New York, NY 10128-0654.
- What is Mark D. Horowitz MD PC's phone number?
- The practice phone number listed in the NPPES registry for Mark D. Horowitz MD PC is (212) 860-3077.
- Does Mark D. Horowitz MD PC accept Medicare?
- Mark D. Horowitz MD PC is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Mark D. Horowitz MD PC?
- The authorized official listed on Mark D. Horowitz MD PC's NPPES record is Mark Horowitz, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark D. Horowitz MD PC's NPI active?
- Yes — Mark D. Horowitz MD PC's NPI (1780988717) is active in the NPPES registry as of the last update on 2011-01-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.