Clarke Nelson, M.D., PH.D.
NPI 1558894923 · Ophthalmology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clarke Nelson, M.D., PH.D. is a Ophthalmology Physician provider in Baltimore, MD (NPI 1558894923).
Provider details
- NPI number
- 1558894923
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D0091534 (MD)
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
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,207 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) |
|---|---|---|
| Measurement of Corneal Curvature and Depth of Eye92136 | 186 | $47 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 170 | $510 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 151 | $132 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 143 | $94 |
| Microfluid Analysis of Tears83861 | 86 | $22 |
| Imaging of Optic Nerve92133 | 81 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 254 | 87 |
| Prednisolone Acetate | 155 | 103 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 137 | 39 |
| Timolol Maleate | 96 | 40 |
| Ofloxacin | 51 | 43 |
| Brimonidine Tartrate | 46 | 14 |
| Ketorolac Tromethamine | 22 | — |
| Netarsudil Mesylat/Latanoprost |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$843 across 22 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
Additional practice locations (1)
- 345 Saint Paul StBuntin Building, 7th FloorBaltimore, MD 21202-2123Phone: (410) 332-9694
Registry dates
- Enumerated
- 2017-04-04
- Last updated
- 2021-06-11
- Certified
- 2021-06-11
Frequently asked questions
- What is Clarke Nelson's NPI number?
- Clarke Nelson's National Provider Identifier (NPI) is 1558894923, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clarke Nelson's specialty?
- Clarke Nelson is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Clarke Nelson located?
- Clarke Nelson's practice location on file with NPPES is 100 Park Ave, Baltimore, MD 21201-3416.
- What is Clarke Nelson's phone number?
- The practice phone number listed in the NPPES registry for Clarke Nelson is (410) 752-1677.
- Does Clarke Nelson accept Medicare?
- Clarke Nelson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clarke Nelson's NPI active?
- Yes — Clarke Nelson's NPI (1558894923) is active in the NPPES registry as of the last update on 2021-06-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.