NPI Portal NPI Lookup & Verification

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

Dr. Frank O. Main Jr., ED.D, LMFT

Marriage & Family Therapist in Sioux Falls, SD · enumerated 2012.

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

National Provider Identifier

1740526870

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Registry record

Entity type Individual (Type 1)
Name Dr. Frank O. Main Jr.
Credential ED.D, LMFT
Sex Male
Practice address Sioux Falls, SD, 57106
Phone (605) 334-7713
Fax (605) 334-5348
Enumeration date Dec 18, 2012
Last updated in NPPES Dec 18, 2012

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

Taxonomy & licenses

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License SD.LMFT#1051 (SD) Primary
LMFT · Licensed Marriage and Family Therapist: A licensed therapist specializing in relational and family psychotherapy. About the LMFT 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 Frank Main?
The National Provider Identifier (NPI) for Frank Main is 1740526870, a Type 1 (individual) record in the CMS NPPES registry.
Where does Frank Main practice?
The practice location on file with NPPES is in Sioux Falls, SD. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-12-18.