Diane Horowitz, M.D.
NPI 1275774101 · Rheumatology Physician · New Hyde Park, NY
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diane Horowitz, M.D. is a Rheumatology Physician provider in New Hyde Park, NY (NPI 1275774101).
Provider details
- NPI number
- 1275774101
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 246416 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,420 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 332 | $147 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 273 | $19 |
| Injection of Drug Or Substance Into Vein96374 | 141 | $44 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 131 | $209 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 130 | $9 |
| Administration of Chemotherapy Into Vein, Each Additional Hour |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 232 | 73 |
| Prednisone | 215 | 74 |
| Methylprednisolone | 96 | 26 |
| Diclofenac Sodium | 91 | 39 |
| Methotrexate Sodiumbrand: Methotrexate | 76 | 28 |
| Gabapentin | 72 | 26 |
| Leflunomide | 69 | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,731 across 31 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-03-24
- Last updated
- 2010-01-07
Frequently asked questions
- What is Diane Horowitz's NPI number?
- Diane Horowitz's National Provider Identifier (NPI) is 1275774101, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diane Horowitz's specialty?
- Diane Horowitz is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Diane Horowitz located?
- Diane Horowitz's practice location on file with NPPES is 2800 Marcus Ave, New Hyde Park, NY 11042-1008.
- What is Diane Horowitz's phone number?
- The practice phone number listed in the NPPES registry for Diane Horowitz is (516) 708-2550.
- Does Diane Horowitz accept Medicare?
- Diane Horowitz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diane Horowitz's NPI active?
- Yes — Diane Horowitz's NPI (1275774101) is active in the NPPES registry as of the last update on 2010-01-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.