Gregory Doren, M.D.
NPI 1851411847 · Ophthalmology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Doren, M.D. is a Ophthalmology Physician provider in Chicago, IL (NPI 1851411847).
Provider details
- NPI number
- 1851411847
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 036079629 (IL)
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
2,857 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 | 947 | $127 |
| Imaging of Retina92134 | 362 | $40 |
| Exam of Visual Field With Extended Testing92083 | 305 | $64 |
| Photography of the Retina92250 | 303 | $36 |
| Exam of the Internal Drainage System of Eye92020 | 213 | $28 |
| Imaging of Optic Nerve92133 | 171 | $34 |
| Ultrasound Scan to Determine Eye Length and Lens Power76519 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 678 | 204 |
| Prednisolone Acetate | 228 | 141 |
| Dorzolamide Hcl | 188 | 48 |
| Erythromycin Basebrand: Erythromycin | 166 | 125 |
| Timolol Maleate | 165 | 46 |
| Ketorolac Tromethamine | 117 | 66 |
| Ciprofloxacin Hcl | 116 | 86 |
| Brimonidine Tartrate | 72 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-31
- Last updated
- 2021-12-29
- Certified
- 2021-12-29
Frequently asked questions
- What is Gregory Doren's NPI number?
- Gregory Doren's National Provider Identifier (NPI) is 1851411847, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Doren's specialty?
- Gregory Doren is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Doren located?
- Gregory Doren's practice location on file with NPPES is 3000 N Halsted St, Chicago, IL 60657-5188.
- What is Gregory Doren's phone number?
- The practice phone number listed in the NPPES registry for Gregory Doren is (773) 935-2800.
- Does Gregory Doren accept Medicare?
- Gregory Doren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Doren's NPI active?
- Yes — Gregory Doren's NPI (1851411847) is active in the NPPES registry as of the last update on 2021-12-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.