Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Katherine Leonard Callahan, LCSW-C

Clinical Social Worker in Easton, MD · enumerated 2006.

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

National Provider Identifier

1598852212

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Registry record

Entity type Individual (Type 1)

Name Mrs. Katherine Leonard Callahan

Credential LCSW-C

Sex Female

Practice address 8614 Ocean Gtwy, Ste 4, Easton, MD, 21601

Phone (410) 690-8181

Fax (410) 690-8181

Enumeration date Oct 6, 2006

Last updated in NPPES Apr 6, 2020

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 07050 (MD) Primary

Other identifiers

Identifier	Type	State	Issuer
517251	Other	-	UNITED HEALTH CARE MAMSI
517251	Other	-	UHC MAMSI GROUP
609550002	Medicaid	MD	-
LM49EA	Other	MD	CAREFIRST BCBS GROUP
259147000	Other	MD	MAGELLAN GROUP
522555502	Other	MD	CAREFIRST BCBS PIN
724337	Other	-	NCPPO PIN
003953	Other	-	VALUE OPTIONS
100062229001	Other	-	AMERICAN PSYCH SYSTEM
6296784	Other	-	UNITED BEHAVIORAL HEALTH
R968	Other	DC	CAREFIRST FEDERAL GROUP
0012	Other	DC	CAREFIRST FEDERAL PIN
461837000	Other	MD	MAGELLAN PIN

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.

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Frequently asked questions

What specialty is Katherine Callahan?

Katherine Callahan is registered in NPPES with the primary taxonomy of Clinical Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Anastasia Tusa Psychiatric/Mental Health Nurse Practitioner · Easton, MD NPI 1063777043 Amy Thomas Mental Health Counselor · Easton, MD NPI 1992175079 Stacy Hemsley Professional Counselor · Easton, MD NPI 1689112559 Arman C. Moshyedi, MD, LLC Psychiatry Physician · Easton, MD NPI 1578121265 Community Behavioral Health, LLC Community/Behavioral Health Agency · Easton, MD NPI 1174161087 Community Behavioral Health, LLC Community/Behavioral Health Agency · Easton, MD NPI 1114565694 Community Behavioral Health LLC Community/Behavioral Health Agency · Easton, MD NPI 1578101051 Community Behavioral Health LLC Respite Care · Easton, MD NPI 1396331393

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-04-06.