Marc Dinowitz, M.D.
NPI 1578582466 · Ophthalmology Physician · Riverhead, NY
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Dinowitz, M.D. is a Ophthalmology Physician provider in Riverhead, NY (NPI 1578582466).
Provider details
- NPI number
- 1578582466
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 207586 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
4,711 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Complete Exam of Visual System92014 | 1,778 | $145 |
| Imaging of Retina92134 | 608 | $46 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 584 | $105 |
| New Patient Complete Exam of Visual System92004 | 343 | $171 |
| Measurement of Corneal Curvature and Depth of Eye92136 | 312 | $44 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 291 | $624 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 509 | 163 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 286 | 80 |
| Prednisolone Acetate | 182 | 141 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 129 | 108 |
| Erythromycin Basebrand: Erythromycin | 73 | 48 |
| Travoprost | 51 | 14 |
| Timolol Maleate | 44 | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-19
- Last updated
- 2016-12-14
Frequently asked questions
- What is Marc Dinowitz's NPI number?
- Marc Dinowitz's National Provider Identifier (NPI) is 1578582466, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Dinowitz's specialty?
- Marc Dinowitz is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Dinowitz located?
- Marc Dinowitz's practice location on file with NPPES is 937 E Main St, Riverhead, NY 11901-2564.
- What is Marc Dinowitz's phone number?
- The practice phone number listed in the NPPES registry for Marc Dinowitz is (631) 369-0777.
- Does Marc Dinowitz accept Medicare?
- Marc Dinowitz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Dinowitz's NPI active?
- Yes — Marc Dinowitz's NPI (1578582466) is active in the NPPES registry as of the last update on 2016-12-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.