Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mary Darlene Hill, PH.D.

Q: What is the NPI number for Mary Hill?

The National Provider Identifier (NPI) for Mary Hill is 1164574984, a Type 1 (individual) record in the CMS NPPES registry.

Group Psychotherapy Psychologist in Bel Air, MD · enumerated 2007 · practices at Human Development Center.

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

National Provider Identifier

1164574984

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Registry record

Entity type Individual (Type 1)

Name Dr. Mary Darlene Hill

Credential PH.D.

Sex Female

Practice address Bel Air, MD, 21014

Phone (410) 893-3082

Enumeration date Jan 18, 2007

Last updated in NPPES Sep 11, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 3724 (MD) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 3724 (MD) Secondary

103TC2200X Clinical Child & Adolescent Psychologist Behavioral Health & Social Service Providers · License 3724 (MD) Secondary

103TP2701X Group Psychotherapy Psychologist Behavioral Health & Social Service Providers · License 3724 (MD) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
J206-0001	Other	MD	CAREFIRST
156AHU	Other	MD	CAREFIRST

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 Hill?

The National Provider Identifier (NPI) for Mary Hill is 1164574984, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Hill practice?

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

Other providers at this practice address

Browse all →

Sandor Szollos Clinical Psychologist · Bel Air, MD NPI 1508952078 Human Development Center Mental Health Clinic/Center (Including Community Mental Health Center) · Bel Air, MD NPI 1750561148

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.