Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jeffrey Allen Markow, LGPC

Professional Counselor in Ellicott City, MD · enumerated 2024 · practices at Catalyst Counseling LLC.

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

National Provider Identifier

1629800537

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Registry record

Entity type Individual (Type 1)

Name Jeffrey Allen Markow

Credential LGPC

Sex Male

Practice address 8181 Main Street, 2nd Floor, Ellicott City, MD, 21043

Phone (410) 505-0062

Enumeration date Aug 19, 2024

Last updated in NPPES Aug 19, 2024

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License LGP15204 (MD) Primary

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

Where does Jeffrey Markow practice?

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

What is the NPI number for Jeffrey Markow?

The National Provider Identifier (NPI) for Jeffrey Markow is 1629800537, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-19.