Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stephanie Julianna Waterhouse, RPA

Psychologist in Rockville, MD · enumerated 2018.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1801394309

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Registry record

Entity type Individual (Type 1)

Name Stephanie Julianna Waterhouse

Credential RPA

Sex Female

Practice address 9707 Key West Ave Ste 100, Rockville, MD, 20850

Phone (240) 750-6467

Fax (240) 702-0262

Enumeration date Jan 30, 2018

Last updated in NPPES Aug 22, 2021

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers Secondary

103TC1900X Counseling Psychologist Behavioral Health & Social Service Providers · License A0609 (MD) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License A0609 (MD) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Stephanie Waterhouse practice?

The practice location on file with NPPES is in Rockville, MD. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Stephanie Waterhouse?

The National Provider Identifier (NPI) for Stephanie Waterhouse is 1801394309, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-08-22.