NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Hall Farley, M.D.

Gynecologic Oncology Physician in Phoenix, AZ · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1427034578

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. John Hall Farley
Credential M.D.
Sex Male
Practice address 625 N 6th St, Attn: Gynecologic Oncology, Phoenix, AZ, 85004
Phone (602) 406-8222
Fax (602) 406-0682
Enumeration date Dec 21, 2005
Last updated in NPPES Jun 8, 2026

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 44143 (AZ) Secondary
207VX0201X Gynecologic Oncology Physician Allopathic & Osteopathic Physicians · License 44143 (AZ) Primary
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
620575 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is John Farley?
John Farley is registered in NPPES with the primary taxonomy of Gynecologic Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
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.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-08.