Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Maria Muessen, NP-C
Nurse Practitioner in Arlington, VA · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1487191680
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Registry record
Entity type Individual (Type 1)
Name Mrs. Maria Muessen
Credential NP-C
Sex Female
Practice address 3263 Columbia Pike, Arlington, VA, 22204
Phone (703) 746-0111
Fax (703) 746-6388
Enumeration date Jan 25, 2017
Last updated in NPPES Sep 16, 2020
Taxonomy & licenses
363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 0024174370 (VA) Secondary
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 0024174370 (VA) 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
What specialty is Maria Muessen?
Maria Muessen is registered in NPPES with the primary taxonomy of Nurse Practitioner. 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.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-16.