Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Johnny Lee Williamson, MD

Child & Adolescent Psychiatry Physician in New Lenox, IL · enumerated 2006.

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

National Provider Identifier

1144310509

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Registry record

Entity type Individual (Type 1)

Name Dr. Johnny Lee Williamson

Credential MD

Sex Male

Practice address 2081 Calistoga Dr, Suite 2s, New Lenox, IL, 60451

Phone (815) 418-6070

Fax (779) 803-3119

Enumeration date Oct 13, 2006

Last updated in NPPES Dec 26, 2025

Taxonomy & licenses

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians · License 2022-02652 (NC) Secondary

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians · License 169712 (CA) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License D0090783 (MD) Secondary

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians · License 036100519 (IL) Primary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 036100519 (IL) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 169712 (CA) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
036100519	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.

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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 Johnny Williamson?

Johnny Williamson is registered in NPPES with the primary taxonomy of Child & Adolescent Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-26.