Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Elton Lao Ong
Physical Therapist in Belvidere, IL · enumerated 2019.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1871144303
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Registry record
Entity type Individual (Type 1)
Name Mark Elton Lao Ong
Sex Male
Practice address 2250 Pearl St, Belvidere, IL, 61008
Phone (815) 544-0358
Enumeration date Sep 25, 2019
Last updated in NPPES Sep 25, 2019
Taxonomy & licenses
225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 070021359 (IL) Primary
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.
Frequently asked questions
Where does Mark Elton Ong practice?
The practice location on file with NPPES is in Belvidere, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Elton Ong?
The National Provider Identifier (NPI) for Mark Elton Ong is 1871144303, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-09-25.