Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William W Walker, MD
Pulmonary Disease Physician in Anderson, SC · enumerated 2005 · practices at Carolina Pulmonary and Sleep.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1700889904
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 000087326D | Medicaid | GA | - |
| GP4557 | Medicaid | SC | - |
| P00944914 | Other | SC | RR MEDICARE |
| 078356 | Medicaid | SC | - |
| 8607 | Other | SC | MEDICARE GROUP NUMBER |
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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Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-08-19.