Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William A. Arnold, M.D.
Surgery Physician in Phoenix, AZ · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720042591
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Registry record
Entity type Individual (Type 1)
Name Dr. William A. Arnold
Credential M.D.
Sex Male
Practice address 222 W Thomas Rd, Suite 301, Phoenix, AZ, 85013
Phone (602) 406-6900
Fax (602) 406-4922
Enumeration date Apr 17, 2006
Last updated in NPPES Jan 21, 2014
Taxonomy & licenses
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 |
|---|---|---|---|
| 870239 | Medicaid | AZ | - |
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 William Arnold practice?
The practice location on file with NPPES is in Phoenix, AZ. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Arnold?
The National Provider Identifier (NPI) for William Arnold is 1720042591, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-01-21.