NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ellen Louise Marolf, AU.D.

Audiologist in Columbia, MO · enumerated 2018.

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

National Provider Identifier

1538651021

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Ellen Louise Marolf
Credential AU.D.
Sex Female
Practice address 525 N Keene St Ste 201, Columbia, MO, 65201
Phone (573) 882-7903
Fax (573) 884-4607
Enumeration date May 31, 2018
Last updated in NPPES Sep 15, 2022

Taxonomy & licenses

231H00000X Audiologist Speech, Language and Hearing Service Providers · License 2020006377 (MO) Primary
AUD · Doctor of Audiology: A licensed audiologist diagnosing and treating hearing and balance disorders. About the AUD 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Ellen Marolf practice?
The practice location on file with NPPES is in Columbia, MO. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Ellen Marolf?
The National Provider Identifier (NPI) for Ellen Marolf is 1538651021, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-09-15.