Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Robert Ricardo Walker, M.D.

Internal Medicine Physician in Greenville, SC · enumerated 2006.

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

National Provider Identifier

1659320943

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Registry record

Entity type Individual (Type 1)

Name Robert Ricardo Walker

Credential M.D.

Sex Male

Practice address 1007 Grove Rd, Suite D, Greenville, SC, 29605

Phone (864) 558-0405

Fax (864) 558-0407

Enumeration date May 6, 2006

Last updated in NPPES Jun 22, 2016

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 19534 (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
GP6470	Medicaid	SC	-
110230171	Other	SC	RR MEDICARE
195345	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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1659320943 active?

Yes, as of the latest NPPES snapshot, NPI 1659320943 is active (record last updated 2016-06-22).

How do I verify Robert Walker's NPI record?

Cross-check NPI 1659320943 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 2016-06-22.