Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Diane Jean Ernst, ARNP
Nurse Practitioner in Decorah, IA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1285695999
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Registry record
Entity type Individual (Type 1)
Name Ms. Diane Jean Ernst
Credential ARNP
Sex Female
Practice address 901 Montgomery St, Decorah, IA, 52101
Phone (563) 382-9671
Fax (563) 382-4143
Enumeration date Mar 31, 2006
Last updated in NPPES Sep 23, 2008
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License C044854 (IA) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 0434761 | Medicaid | IA | - |
| IA0108 | Other | IA | JOHN DEERE HEALTHCARE |
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
Where does Diane Ernst practice?
The practice location on file with NPPES is in Decorah, IA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Diane Ernst?
The National Provider Identifier (NPI) for Diane Ernst is 1285695999, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-23.