Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Joel T Callahan Thomas H Greer Jr & A Gary Boone Ptr

Internal Medicine Physician in Meridian, MS · enumerated 2007 · authorized official James Allen, Administrator.

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

National Provider Identifier

1932248853

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)

Legal business name Joel T Callahan Thomas H Greer Jr & A Gary Boone Ptr

Other name <Unavail>

Practice address 1600 22nd Ave, Medical Towers III, Meridian, MS, 39301

Phone (601) 483-5322

Fax (601) 693-8081

Enumeration date Feb 6, 2007

Last updated in NPPES Dec 14, 2011

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name James Allen

Title Administrator

Phone (601) 581-2295

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 type of organization is Joel T Callahan Thomas H Greer Jr & A Gary Boone Ptr?

Joel T Callahan Thomas H Greer Jr & A Gary Boone Ptr is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-12-14.