Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John William Milionis, D.O.
Pediatrics Physician in Phoenix, AZ · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1861430365
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. John William Milionis
Credential D.O.
Sex Male
Practice address 14045 N 7th St Ste 2, Phoenix, AZ, 85022
Phone (602) 482-7311
Fax (602) 482-7314
Enumeration date Jun 4, 2006
Last updated in NPPES Jan 24, 2019
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 |
|---|---|---|---|
| 342741 | Other | AZ | AMCCCS |
| 342741 | 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
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is John Milionis?
John Milionis is registered in NPPES with the primary taxonomy of Pediatrics Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Louis Trunzo Pediatrics Physician · Phoenix, AZ NPI 1922067545 North Valley Pediatrics PC Pediatrics Physician · Phoenix, AZ NPI 1578700852 Adonai Outpatient Treatment Center LLC. Mental Health Clinic/Center (Including Community Mental Health Center) · Phoenix, AZ NPI 1629780432 William Deihl Mental Health Counselor · Phoenix, AZ NPI 1346123023
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-01-24.