Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Greenville Health System

Q: What is the NPI number for Greenville Health System?

The NPI for Greenville Health System is 1164821831, a Type 2 (organization) record in the CMS NPPES registry.

General Acute Care Hospital in Seneca, SC · enumerated 2014 · authorized official Michael Riordan, President / Ceo.

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

National Provider Identifier

1164821831

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Registry record

Entity type Organization (Type 2)

Legal business name Greenville Health System

Other name <Unavail>

Practice address 298 Memorial Dr, Seneca, SC, 29672

Phone (864) 882-3351

Enumeration date Aug 19, 2014

Last updated in NPPES Apr 30, 2015

Taxonomy & classification

282N00000X General Acute Care Hospital Hospitals · License HTL-000 (SC) Primary

Authorized official

Name Michael Riordan

Title President / Ceo

Phone (864) 797-7808

Other identifiers

Identifier	Type	State	Issuer
Q450010002	Other	SC	PTAN

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Who is the authorized official for Greenville Health System?

NPPES lists Michael Riordan (President / Ceo) as the authorized official for this organization.

What is the NPI number for Greenville Health System?

The NPI for Greenville Health System is 1164821831, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-04-30.