Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Margaret Marie John, DC

Chiropractor in Argyle, TX · enumerated 2009.

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

National Provider Identifier

1558504274

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Registry record

Entity type Individual (Type 1)

Name Dr. Margaret Marie John

Credential DC

Sex Female

Practice address Argyle, TX, 76226

Phone (817) 276-0311

Enumeration date Apr 10, 2009

Last updated in NPPES Jun 4, 2019

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License 11155 (TX) Primary

DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

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.

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Frequently asked questions

How do I verify Margaret John's NPI record?

Cross-check NPI 1558504274 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1558504274 active?

Yes, as of the latest NPPES snapshot, NPI 1558504274 is active (record last updated 2019-06-04).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-06-04.