Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Leah Marie-Kathleen Derr, LGSW
Social Worker in Frederick, MD · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1043727258
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Registry record
Entity type Individual (Type 1)
Name Ms. Leah Marie-Kathleen Derr
Credential LGSW
Sex Female
Practice address 226 S Jefferson St, Frederick, MD, 21701
Phone (301) 663-6135
Enumeration date Jan 9, 2018
Last updated in NPPES Jan 9, 2018
Taxonomy & licenses
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 is the NPI number for Leah Derr?
The National Provider Identifier (NPI) for Leah Derr is 1043727258, a Type 1 (individual) record in the CMS NPPES registry.
Where does Leah Derr practice?
The practice location on file with NPPES is in Frederick, MD. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Mental Health Assoc. of Frederick Country, Counseling Services Community/Behavioral Health Agency · Frederick, MD NPI 1356687917 Sarah Barcus Professional Counselor · Frederick, MD NPI 1609113810 Lara Knepper Clinical Social Worker · Frederick, MD NPI 1336586841 Mental Health Assoc of Frederick Cty Clinical Social Worker · Frederick, MD NPI 1568902260 Carissa Ferguson Clinical Social Worker · Frederick, MD NPI 1831615954 Richard Deise Pastoral Counselor · Frederick, MD NPI 1669983607 Ariel Jacobs Mental Health Counselor · Frederick, MD NPI 1679040547 Linda Cann Psychiatric/Mental Health Nurse Practitioner · Frederick, MD NPI 1033754221
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-09.