Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
John Ross Williamson, APRN, NP-C
Nurse Practitioner in Cordell, OK · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1386050441
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Registry record
Entity type Individual (Type 1)
Name John Ross Williamson
Credential APRN, NP-C
Sex Male
Practice address 1220 N Glenn English St, Cordell, OK, 73632
Phone (580) 832-3339
Enumeration date Jul 9, 2014
Last updated in NPPES Jan 9, 2020
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 102511 (OK) Primary
APRN · Advanced Practice Registered Nurse: An umbrella credential covering NPs, CRNAs, CNMs, and clinical nurse specialists.
About the APRN credential
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 John Williamson practice?
The practice location on file with NPPES is in Cordell, OK. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Williamson?
The National Provider Identifier (NPI) for John Williamson is 1386050441, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-01-09.