Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Mary Gordon Walter, RN/NP, PMHNP-BC

Q: What is the NPI number for Mary Walter?

The National Provider Identifier (NPI) for Mary Walter is 1023449642, a Type 1 (individual) record in the CMS NPPES registry.

Psychiatric/Mental Health Nurse Practitioner in Prince Frederick, MD · enumerated 2013.

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

National Provider Identifier

1023449642

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Registry record

Entity type Individual (Type 1)

Name Ms. Mary Gordon Walter

Credential RN/NP, PMHNP-BC

Sex Female

Practice address 976 Solomans Island Road, Prince Frederick, MD, 20678

Phone (410) 535-5400

Enumeration date Dec 7, 2013

Last updated in NPPES Sep 29, 2015

Taxonomy & licenses

163WE0003X Emergency Registered Nurse Nursing Service Providers · License RN2274139 (MA) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN2274139 (MA) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License R217581 (MD) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Mary Walter?

The National Provider Identifier (NPI) for Mary Walter is 1023449642, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Walter practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-09-29.