NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John S Ferris, MD

Internal Medicine Physician in Grapevine, TX · enumerated 2006.

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

National Provider Identifier

1538257084

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name John S Ferris
Credential MD
Sex Male
Practice address 1604 Lancaster Dr, Grapevine, TX, 76051
Phone (817) 481-8661
Fax (817) 416-8801
Enumeration date Oct 10, 2006
Last updated in NPPES Jun 28, 2022

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License E6346 (TX) 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
1279085 Medicaid TX -

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 is the NPI number for John Ferris?
The National Provider Identifier (NPI) for John Ferris is 1538257084, a Type 1 (individual) record in the CMS NPPES registry.
Where does John Ferris practice?
The practice location on file with NPPES is in Grapevine, TX. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-28.