Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Lee Johnson, MD

Pediatric Allergy/Immunology Physician in Saint Louis, MO · enumerated 2005.

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

National Provider Identifier

1669476495

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Registry record

Entity type Individual (Type 1)

Name Dr. William Lee Johnson

Credential MD

Sex Male

Practice address 1 Childrens Pl, Saint Louis, MO, 63110

Phone (314) 454-2694

Fax (314) 454-2515

Enumeration date Jun 9, 2005

Last updated in NPPES Jan 24, 2018

Taxonomy & licenses

2080P0201X Pediatric Allergy/Immunology Physician Allopathic & Osteopathic Physicians · License R1F19 (MO) Primary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License R1F19 (MO) 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
202878708	Medicaid	MO	-
ENROLLED	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

Where does William Johnson practice?

The practice location on file with NPPES is in Saint Louis, MO. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Johnson?

The National Provider Identifier (NPI) for William Johnson is 1669476495, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-01-24.