Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. David Steven Duncan, PHARMD
Pharmacist in Walnut, CA · enumerated 2011.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1124304951
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Registry record
Entity type Individual (Type 1)
Name Mr. David Steven Duncan
Credential PHARMD
Sex Male
Practice address 19755 Vista Hermosa Dr, Walnut, CA, 91789
Phone (909) 881-1813
Fax (909) 881-6694
Enumeration date Oct 25, 2011
Last updated in NPPES Oct 25, 2011
Taxonomy & licenses
PHARMD · Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy.
About the PHARMD credential
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.
Frequently asked questions
Where does David Duncan practice?
The practice location on file with NPPES is in Walnut, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for David Duncan?
The National Provider Identifier (NPI) for David Duncan is 1124304951, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-25.