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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Anthony Messer, M.D.

Family Medicine Physician in Greenville, SC · enumerated 2006 · practices at St Francis Physician Services Inc.

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

National Provider Identifier

1700814985

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Registry record

Entity type Individual (Type 1)
Name William Anthony Messer
Credential M.D.
Sex Male
Practice address 124 Verdae Blvd Ste 204, Greenville, SC, 29607
Phone (864) 315-1300
Enumeration date Jun 28, 2006
Last updated in NPPES Apr 24, 2024

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 18865 (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
5644689 Other SC AETNA
080146066 Other SC RR MEDICARE
2405190 Other SC CIGNA

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 NPI 1700814985 active?
Yes, as of the latest NPPES snapshot, NPI 1700814985 is active (record last updated 2024-04-24).
How do I verify William Messer's NPI record?
Cross-check NPI 1700814985 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-04-24.