NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Grennan Chiropractic Pllc

Nutrition Chiropractor in Irving, TX · enumerated 2010 · authorized official Carol Grennan, Owner.

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

National Provider Identifier

1891096251

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Grennan Chiropractic Pllc
Practice address 7447 N Macarthur Blvd, Suite 180, Irving, TX, 75063
Phone (972) 253-1500
Fax (972) 253-1505
Enumeration date Nov 16, 2010
Last updated in NPPES Jun 12, 2015

Taxonomy & classification

111NN1001X Nutrition Chiropractor Chiropractic Providers · License 6435 (TX) Primary

Authorized official

Name Carol Grennan
Title Owner
Phone (972) 253-1500

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

How current is this record?
Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2015-06-12. Verify at npiregistry.cms.hhs.gov.
Where is Grennan Chiropractic Pllc located?
The practice location on file with NPPES is in Irving, TX.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-06-12.