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Dr. William Cain JR., MD

Ophthalmology (Ophthalmology Physician)

At a glance

In the NPI registry since
2006

The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is

Education and training

  • 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier

Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).

Specialties and state licenses

  • Ophthalmology Physician primary
    SC license 7270

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Ophthalmology per capita by county →

Medicare patients and services

Most frequent Medicare services, 2023
ServiceTimesPatients
Established patient complete exam of visual system746725
Imaging of optic nerve320296
Established patient problem focused exam of visual system225161
Exam of visual field with extended testing164153
Measurement of corneal curvature and depth of eye11480
Imaging of retina10194
Removal of cataract with insertion of prosthetic lens9468
Removal of recurring cataract in lens capsule using a laser9281
Exam of the internal drainage system of eye7871
Closure of tear duct opening using plug4129

Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.

Medicare prescriptions

Most prescribed drugs, Medicare Part D 2024
DrugPrescriptions
Latanoprost
Other prescribers in Columbia, SC
63
Restasis (cyclosporine)
Other prescribers in Columbia, SC
19
Rocklatan (netarsudil mesylat/latanoprost)
Other prescribers in Columbia, SC
18
Cyclosporine
Other prescribers in Columbia, SC
14

Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.

Other Ophthalmology clinicians in Columbia

Sources

NPI registry (CMS NPPES, November 2026; record last updated August 17, 2020), Medicare Care Compare, Medicare Physician & Other Practitioners (2024), Medicare Part D Prescribers (2024) and Open Payments (2025). Information is self-reported or billed data and may be out of date; call before visiting.

NPI 1902869308. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.