Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Dennis Clayton Witherwax, R.PH.
Pharmacist in Anaheim, CA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1528187630
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Registry record
Entity type Individual (Type 1)
Name Mr. Dennis Clayton Witherwax
Credential R.PH.
Sex Male
Practice address 1120 W La Palma Ave, Suite 1, Anaheim, CA, 92801
Phone (714) 776-2800
Fax (714) 776-2118
Enumeration date Mar 28, 2007
Last updated in NPPES Mar 30, 2015
Taxonomy & licenses
RPH · Registered Pharmacist: A licensed pharmacist registered with a state board of pharmacy.
About the RPH credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 25141 | Other | CA | PHARMACY LICENSE |
| 03996 | Other | NV | PHARMACY LICENSE |
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
What is the NPI number for Dennis Witherwax?
The National Provider Identifier (NPI) for Dennis Witherwax is 1528187630, a Type 1 (individual) record in the CMS NPPES registry.
Where does Dennis Witherwax practice?
The practice location on file with NPPES is in Anaheim, CA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Ravi Makam Specialist · Anaheim, CA NPI 1720070527 Stewart Stempniak Physical Therapist · Anaheim, CA NPI 1689683757 Samara Palacio Cardenas M.D. A Professional Corporation Primary Care Clinic/Center · Anaheim, CA NPI 1447361324 John Yee Obstetrics & Gynecology Physician · Anaheim, CA NPI 1477629038 Makam Medical Corporation Cardiovascular Disease Physician · Anaheim, CA NPI 1821132655 Melinh Do General Practice Dentistry · Anaheim, CA NPI 1922200229 John K Yee MD Incorporate Obstetrics & Gynecology Physician · Anaheim, CA NPI 1609151927
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-03-30.