Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark David Herndon, MD

Surgery Physician in Clinton, SC · enumerated 2007.

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

National Provider Identifier

1285751107

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark David Herndon

Credential MD

Sex Male

Practice address 1012 Medical Ridge Rd, Clinton, SC, 29325

Phone (864) 822-3852

Fax (864) 938-0501

Enumeration date Mar 24, 2007

Last updated in NPPES May 25, 2021

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 58753 (GA) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 32321 (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
323215	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

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.

What specialty is Mark Herndon?

Mark Herndon is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-25.