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

Dr. Jack Martin Long, PH.D.

Clinical Social Worker in Catonsville, MD · enumerated 2006.

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

National Provider Identifier

1447296629

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Registry record

Entity type Individual (Type 1)

Name Dr. Jack Martin Long

Credential PH.D.

Sex Male

Practice address Catonsville, MD, 21228

Phone (410) 744-5499

Fax (410) 455-0894

Enumeration date Jun 22, 2006

Last updated in NPPES Dec 12, 2011

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 03068 (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
755011100	Medicaid	MD	-
R7610001	Other	MD	BC/BS FEDERAL
Q292JM	Other	MD	BLUE CROSS/ BLUE SHIELD
R7610001	Other	MD	BLUE CHOICE
276629	Other	MD	MAMSI

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

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.

What specialty is Jack Long?

Jack Long 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.

Other providers at this practice address

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Sheila Sevidal Clinical Social Worker · Baltimore, MD NPI 1952328536

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-12-12.