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

Mary T Guth, LMFT, LPC-MH

Mental Health Counselor in Sioux Falls, SD · enumerated 2006.

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

National Provider Identifier

1235293242

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Registry record

Entity type Individual (Type 1)

Name Mary T Guth

Credential LMFT, LPC-MH

Sex Female

Practice address Sioux Falls, SD, 57105

Phone (605) 951-8423

Fax (605) 274-1704

Enumeration date Dec 21, 2006

Last updated in NPPES May 5, 2011

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

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License LPC-MH (SD) Primary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License LMFT (SD) Secondary

LMFT · Licensed Marriage and Family Therapist: A licensed therapist specializing in relational and family psychotherapy. About the LMFT credential

Other identifiers

Identifier	Type	State	Issuer
6575223	Medicaid	SD	-
478657100	Medicaid	MN	-
6575224	Medicaid	SD	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Mary Guth?

Mary Guth is registered in NPPES with the primary taxonomy of Mental Health Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-05-05.