Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Mark Siebert, LCSW
Clinical Social Worker in Orem, UT · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1124445291
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Registry record
Entity type Individual (Type 1)
Name Mr. Mark Siebert
Credential LCSW
Sex Male
Practice address 1458 E 820 N, Orem, UT, 84097
Phone (801) 860-4780
Fax (385) 375-6087
Enumeration date Mar 26, 2014
Last updated in NPPES Feb 21, 2023
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 5958473-3501 (UT) Primary
LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy.
About the LCSW 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.
Frequently asked questions
Where does Mark Siebert practice?
The practice location on file with NPPES is in Orem, UT. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Siebert?
The National Provider Identifier (NPI) for Mark Siebert is 1124445291, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Jennifer Gurr Marriage & Family Therapist · Orem, UT NPI 1902485253 Edward Shin Mental Health Counselor · Orem, UT NPI 1336849017 Phoenix Family Counseling Pllc Marriage & Family Therapist · Orem, UT NPI 1982495529 Heal and Rise LLC Mental Health Clinic/Center (Including Community Mental Health Center) · Orem, UT NPI 1053289579
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-21.