NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Grady Mark Mcmahan, DO

Family Medicine Physician in Greenville, TX · enumerated 2005.

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

National Provider Identifier

1205839537

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Grady Mark Mcmahan
Credential DO
Sex Male
Practice address 4101 Wesley St, Ste C, Greenville, TX, 75401
Phone (903) 454-8111
Fax (903) 454-1680
Enumeration date May 31, 2005
Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License J6584 (TX) Primary
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
P00217687 Other TX RAILROAD MEDICARE
8J1203 Other TX BCBS OF TEXAS

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

Where does Grady Mcmahan practice?
The practice location on file with NPPES is in Greenville, TX. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Grady Mcmahan?
The National Provider Identifier (NPI) for Grady Mcmahan is 1205839537, 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 2007-07-09.