Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Maryvalley Health Services PLLC

Organization Psychiatric/Mental Health Nurse Practitioner · NPI 1477472611

Maryvalley Health Services PLLC is a Psychiatric/Mental Health Nurse Practitioner in Washington, District of Columbia. Registered with an NPI since 2026.

In the registry since
2026
What do these letters mean?
PLLC — Professional limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

1717 N St NW Ste 1
Washington, DC 20036-2827
Phone: (301) 433-3959
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatric/Mental Health Nurse Practitioner (primary) Taxonomy 363LP0808X

Record details

NPI number1477472611
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Frans Tassi — Owner · (301) 433-3959
NPI enumeratedJuly 13, 2026
Last updated in NPPESJuly 13, 2026
Certification dateJuly 13, 2026
Mailing address2508 Didcot Ct # A, Bowie, MD 20721-2978

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