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

Mr. William Thomas Mahalchick, P.T.,M.S,OCS

Orthopedic Physical Therapist in Flemington, NJ · enumerated 2006 · practices at Advantage Orthopaedic Physical Therapy PA.

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

National Provider Identifier

1639238942

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Registry record

Entity type Individual (Type 1)

Name Mr. William Thomas Mahalchick

Credential P.T.,M.S,OCS

Sex Male

Practice address Flemington, NJ, 08822

Phone (908) 284-2444

Fax (908) 284-2442

Enumeration date Dec 6, 2006

Last updated in NPPES Dec 3, 2012

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

Taxonomy & licenses

2251X0800X Orthopedic Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 40QA00334900 (NJ) Primary

PT · Physical Therapist: A licensed movement specialist treating injury and disability through exercise and rehabilitation. About the PT 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

What is the NPI number for William Mahalchick?

The National Provider Identifier (NPI) for William Mahalchick is 1639238942, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Mahalchick practice?

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

Other providers at this practice address

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Advantage Orthopaedic Physical Therapy PA Orthopedic Physical Therapist · Flemington, NJ NPI 1346437084

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-12-03.