Leah Marie-Kathleen Derr, LGSW
Social Worker · Frederick, MD
Leah Marie-Kathleen Derr, LGSW is a social worker with a practice address in Frederick, Maryland, and NPI 1043727258, issued on Jan 9, 2018. Check the license (Maryland 23474, as entered in NPPES) with the Maryland board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Leah Marie-Kathleen Derr
- Credential
- LGSW
- Primary taxonomy
- Social Worker 104100000X
- License number
- 23474 MD
Self-reported in NPPES; status is on the state search - Practice location
- 226 S Jefferson St, Frederick, MD 21701
- Phone
- (301) 663-6135
- Enumerated
- Jan 9, 2018
- Record last updated
- Jan 9, 2018 (not updated in 8 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest social worker records → All 4,073 in Maryland → Look up another NPI →
Also registered at 226 S Jefferson St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Eva Costlow, LCSW-CClinical Social Worker1811594849
- Tess De Smedt, LMSWSocial Worker1780362459
- Richard Deise, LGPCPastoral Counselor1669983607
Verify Leah Marie-Kathleen Derr in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license 23474Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Leah Marie-Kathleen Derr among 4,073 social worker records in Maryland
Leah Marie-Kathleen Derr, LGSW is one of 4,073 social worker records with a practice address in Maryland. 6% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2018, is newer than 27% of them.
- NPI issued2018 · 27% of these records are older, 68% newer
- In a Medicare fileNo · 6% of these records are
- In the CMS Doctors and Clinicians fileNo · 9% of these records are
- Record last updated2018 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 104100000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
135 social worker records list a practice address in Frederick
They are 135 of the 3,981 NPPES records with a practice address in Frederick, and 4,073 social worker records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 4,073 in Maryland → Every provider in Frederick → Social Worker nationwide →
The 8 social worker records with the nearest ZIP codes
- Marie AgbortokoFrederick, MD 217011801168059
- Nnamdi Akwada, LGSW, MSWFrederick, MD 217011205281698
- Ashleigh Athen, LGSWFrederick, MD 217011376065953
- Justin Barrick, LCSW-CFrederick, MD 217011871880518
- Andrea ElliotFrederick, MD 217011396271383
- Sheila Ervin, LCSWFrederick, MD 217011841473469
- Katherine ForsytheFrederick, MD 217011538681564
- Audrey Frank, LCSW-CFrederick, MD 217011881962934
Common questions
What is Leah Marie-Kathleen Derr, LGSW's NPI number?
Leah Marie-Kathleen Derr, LGSW's National Provider Identifier (NPI) is 1043727258, issued on Jan 9, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Leah Marie-Kathleen Derr, LGSW located?
The NPPES record lists a practice address at 226 S Jefferson St, Frederick, MD, 21701. Phone: (301) 663-6135. Providers update this record themselves, so call before visiting.
How can I verify Leah Marie-Kathleen Derr, LGSW's license?
NPPES lists Maryland license number 23474, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.