Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Maria Tsao, M.D.
Psychiatry Physician in Fairfax, VA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1336257278
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Registry record
Entity type Individual (Type 1)
Name Dr. Maria Tsao
Credential M.D.
Sex Female
Practice address 8221 Willow Oaks Corporate Dr, Fairfax, VA, 22031
Phone (703) 207-7819
Enumeration date Aug 29, 2006
Last updated in NPPES Mar 16, 2015
Taxonomy & licenses
2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 0101057741 (VA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD 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 Maria Tsao?
Maria Tsao is registered in NPPES with the primary taxonomy of Psychiatry Physician. 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
Browse all → Kristen Werner Clinical Social Worker · Fairfax, VA NPI 1154341675 Philip Smith Child & Adolescent Psychiatry Physician · Fairfax, VA NPI 1780608984 Lawrence Smith Professional Counselor · Fairfax, VA NPI 1548276710 Bharati Patel Professional Counselor · Fairfax, VA NPI 1750394615 C Prasad Psychiatry Physician · Fairfax, VA NPI 1124131867 Cristina Russu Professional Counselor · Fairfax, VA NPI 1417052952 Andrea Hess Professional Counselor · Fairfax, VA NPI 1053495085 Patricia Sloate Clinical Psychologist · Fairfax, VA NPI 1962563643
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-03-16.