Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Justin L Knowles, MD

Critical Care Medicine (Internal Medicine) Physician in Danville, PA · enumerated 2006 · practices at Geisinger Medical Center.

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

National Provider Identifier

1659456861

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Registry record

Entity type Individual (Type 1)

Name Justin L Knowles

Credential MD

Sex Male

Practice address 100 North Academy Avenue, Danville, PA, 17822

Phone (570) 271-6389

Fax (570) 271-6021

Enumeration date Oct 26, 2006

Last updated in NPPES Aug 24, 2016

Taxonomy & licenses

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License MD456998 (PA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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 Justin Knowles practice?

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

What is the NPI number for Justin Knowles?

The National Provider Identifier (NPI) for Justin Knowles is 1659456861, 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 2016-08-24.