Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mariah Leeann Oyen, DDS
Dentist in Hartford, SD · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1548134836
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Registry record
Entity type Individual (Type 1)
Name Dr. Mariah Leeann Oyen
Credential DDS
Sex Female
Practice address 304 Sd-38, Suite 138, Hartford, SD, 57033
Phone (605) 528-6750
Enumeration date Oct 1, 2025
Last updated in NPPES Oct 1, 2025
Taxonomy & licenses
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees.
About the DDS 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.
Frequently asked questions
What specialty is Mariah Oyen?
Mariah Oyen is registered in NPPES with the primary taxonomy of Dentist. 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.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-01.