Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. James R Siefer, DO
Urology Physician in Chandler, AZ · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1508846627
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Registry record
Entity type Individual (Type 1)
Name Dr. James R Siefer
Credential DO
Sex Male
Practice address 485 S Dobson Rd, Suite 103, Chandler, AZ, 85224
Phone (480) 963-2026
Fax (480) 963-5841
Enumeration date Jan 17, 2006
Last updated in NPPES Jun 7, 2012
Taxonomy & licenses
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD.
About the DO credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 921694 | 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 James Siefer practice?
The practice location on file with NPPES is in Chandler, AZ. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for James Siefer?
The National Provider Identifier (NPI) for James Siefer is 1508846627, 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 2012-06-07.