Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Marilyn Carmen Treinen, OT

Occupational Therapist in Sheldon, IA · enumerated 2006.

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

National Provider Identifier

1831261908

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Registry record

Entity type Individual (Type 1)

Name Mrs. Marilyn Carmen Treinen

Credential OT

Sex Female

Practice address 118 N 7th Ave, Sheldon, IA, 51201

Phone (712) 324-5041

Fax (712) 324-6025

Enumeration date Nov 14, 2006

Last updated in NPPES Jul 9, 2007

Taxonomy & licenses

225X00000X Occupational Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 409 (IA) Primary

OT · Occupational Therapist: A licensed therapist helping patients develop or recover skills for daily living and working. About the OT credential

Other identifiers

Identifier	Type	State	Issuer
0601260	Medicaid	IA	-
0655407	Medicaid	IA	-
0803635	Medicaid	IA	-

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 specialty is Marilyn Treinen?

Marilyn Treinen is registered in NPPES with the primary taxonomy of Occupational Therapist. 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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Ann Berens Certified Registered Nurse Anesthetist · Sheldon, IA NPI 1346241478 Christopher Otto Physical Therapist · Sheldon, IA NPI 1083671705 Sanford Health Network Critical Access Hospital · Sheldon, IA NPI 1841200623 Sanford Health Network Critical Access Hospital · Sheldon, IA NPI 1295848950 Sanford Clinic Preventive Medicine/Occupational Environmental Medicine Physician · Sheldon, IA NPI 1639282940 Sanford Health Network Institutional Pharmacy · Sheldon, IA NPI 1801977335 Sanford Health Network Home Health Agency · Sheldon, IA NPI 1871642223 Sanford Health Network Nursing Facility/Intermediate Care Facility · Sheldon, IA NPI 1164571261

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.