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

Dr. David L Johnston, DO

General Practice Physician in Ridgefield, CT · enumerated 2005.

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

National Provider Identifier

1245212471

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Registry record

Entity type Individual (Type 1)

Name Dr. David L Johnston

Credential DO

Sex Male

Practice address Ridgefield, CT, 06877

Phone (203) 438-9915

Fax (203) 431-4410

Enumeration date Nov 15, 2005

Last updated in NPPES Sep 6, 2012

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

Taxonomy & licenses

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 000523 (CT) 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

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 David Johnston practice?

The practice location on file with NPPES is in Ridgefield, CT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for David Johnston?

The National Provider Identifier (NPI) for David Johnston is 1245212471, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-06.