Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Clarke Storrow Nelson, MD, PHD

Individual provider Ophthalmology Physician · NPI 1558894923

Dr. Clarke Storrow Nelson, MD, PHD practises Ophthalmology in Baltimore, Maryland. Graduated from University of Connecticut School of Medicine in 2017, 9 years ago. Practices with Katzen Medical Associates PC, a 24-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Maryland.

Years since qualifying
9
Trained at
University of Connecticut School of Medicine
Licensed in
MD
In the registry since
2017
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

100 Park Ave
Baltimore, MD 21201-3416
Phone: (410) 752-1677
Fax: (410) 752-4435
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 345 Saint Paul St, Baltimore, MD 21202-2123 — (410) 332-9694

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence D0091534 (MD)

Record details

NPI number1558894923
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedApril 4, 2017
Last updated in NPPESJune 11, 2021
Certification dateJune 11, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPHTHALMOLOGY
Medical schoolUNIVERSITY OF CONNECTICUT SCHOOL OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Katzen Medical Associates Pc — 24 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Cataract surgery 373 times · 92nd percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients456
Services billed 1,260 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $1,037 31 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Katzen Medical Associates PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 24 clinicians in the practice; 12 are shown here.

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