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

Dr. Gregory Robert James O'Neill, D.C.

Chiropractor in Lititz, PA · enumerated 2012 · practices at Lititz Family Chiropractic Pllc.

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

National Provider Identifier

1720323975

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Robert James O'Neill

Credential D.C.

Sex Male

Practice address Lititz, PA, 17543

Phone (570) 238-4582

Enumeration date Nov 29, 2012

Last updated in NPPES Sep 9, 2014

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

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License DC010675 (PA) 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

Where does Gregory O'Neill practice?

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

What is the NPI number for Gregory O'Neill?

The National Provider Identifier (NPI) for Gregory O'Neill is 1720323975, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Lititz Family Chiropractic Pllc Chiropractor · Lititz, PA NPI 1215349352

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-09-09.