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

Dr. Lewis M Irving, DMD

General Practice Dentistry in Chester, PA · enumerated 2008 · practices at Community Transition Academy, Inc. (Mental Health).

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

National Provider Identifier

1689843625

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Registry record

Entity type Individual (Type 1)

Name Dr. Lewis M Irving

Credential DMD

Sex Male

Practice address Chester, PA, 19013

Phone (610) 497-4565

Enumeration date Feb 25, 2008

Last updated in NPPES Feb 25, 2008

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

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License DL26012L (PA) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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

Is NPI 1689843625 active?

Yes, as of the latest NPPES snapshot, NPI 1689843625 is active (record last updated 2008-02-25).

How do I verify Lewis Irving's NPI record?

Cross-check NPI 1689843625 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Community Transition Academy, Inc. (Mental Health) Mental Health Counselor · Chester, PA NPI 1457222531

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-25.