Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mariellen Walz, BA, MST
Social Worker in Ignacio, CO · enumerated 2009.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1881828937
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Registry record
Entity type Individual (Type 1)
Name Mariellen Walz
Credential BA, MST
Sex Female
Practice address 296 Mouache Street, Ignacio, CO, 81137
Phone (970) 563-4555
Enumeration date May 5, 2009
Last updated in NPPES May 5, 2009
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 1106-00 (CO) 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
Is NPI 1881828937 active?
Yes, as of the latest NPPES snapshot, NPI 1881828937 is active (record last updated 2009-05-05).
How do I verify Mariellen Walz's NPI record?
Cross-check NPI 1881828937 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-05-05.