Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Ralph Walter Niemann, DDS MS
Endodontics in Prince Frederick, MD · enumerated 2008.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1669639209
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Registry record
Entity type Individual (Type 1)
Name Dr. Ralph Walter Niemann
Credential DDS MS
Sex Male
Practice address 272 Merrimac Court, Prince Frederick, MD, 20678
Phone (410) 535-2505
Fax (410) 535-2510
Enumeration date May 21, 2008
Last updated in NPPES May 22, 2014
Taxonomy & licenses
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 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.
What specialty is Ralph Niemann?
Ralph Niemann is registered in NPPES with the primary taxonomy of Endodontics. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-05-22.