Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark J Johns, PSYD, CADC

Professional Counselor in Park Ridge, IL · enumerated 2006.

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

National Provider Identifier

1437120680

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark J Johns

Credential PSYD, CADC

Sex Male

Practice address 350 S Northwest Hwy Ste 300, Park Ridge, IL, 60068

Phone (773) 502-8252

Enumeration date Jan 27, 2006

Last updated in NPPES Jul 10, 2024

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 1683 (IL) Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 180.001399 (IL) Secondary

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 180.001399 (IL) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD credential

Other identifiers

Identifier	Type	State	Issuer
180.001399	Medicaid	IL	-

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

What specialty is Mark Johns?

Mark Johns is registered in NPPES with the primary taxonomy of Professional Counselor. 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-10.