NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. David G O'Day, MD

Ophthalmology Physician in Mount Pleasant, SC · enumerated 2006 · practices at Charleston Cornea & Refractive Surgery, PA.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1477514602

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Registry record

Entity type Individual (Type 1)
Name Mr. David G O'Day
Credential MD
Sex Male
Practice address Mount Pleasant, SC, 29464
Phone (843) 856-5275
Fax (843) 856-8953
Enumeration date Mar 29, 2006
Last updated in NPPES Jul 7, 2011

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 18999 (SC) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
571089770 Other SC TAX ID
GP2889 Medicaid SC -

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

What specialty is David O'Day?
David O'Day is registered in NPPES with the primary taxonomy of Ophthalmology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-07-07.