Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gretchen B Mason, PA-C
Physician Assistant in Herrin, IL · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1245229111
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Registry record
Entity type Individual (Type 1)
Name Gretchen B Mason
Credential PA-C
Sex Female
Practice address 510 Lincoln Dr, Herrin, IL, 62948
Phone (618) 997-6800
Fax (618) 998-9124
Enumeration date Oct 13, 2005
Last updated in NPPES Mar 25, 2009
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 0850003442 (IL) Primary
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 Gretchen Mason practice?
The practice location on file with NPPES is in Herrin, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Gretchen Mason?
The National Provider Identifier (NPI) for Gretchen Mason is 1245229111, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Southern Illinois Orthopedic Center,LLC Ambulatory Surgical Clinic/Center · Herrin, IL NPI 1023001377 Joan Schullian Certified Registered Nurse Anesthetist · Herrin, IL NPI 1295724110 Meshia Hughes Physician Assistant · Herrin, IL NPI 1245288802 Southern Orthopedic Associates Sc Orthopaedic Surgery Physician · Herrin, IL NPI 1396792412 Treg Brown Orthopaedic Surgery Physician · Herrin, IL NPI 1598870115 Kimberly Peters Occupational Therapist · Herrin, IL NPI 1568578680 Thomas Davis Orthopaedic Surgery Physician · Herrin, IL NPI 1295842870 Stephen Jackson Orthopaedic Surgery Physician · Herrin, IL NPI 1952418089
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-03-25.