Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Jerrilyn Johnston, M.D.
Pediatrics Physician in Hayward, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1194827980
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Registry record
Entity type Individual (Type 1)
Name Dr. Jerrilyn Johnston
Credential M.D.
Sex Female
Practice address 22290 Foothill Blvd #1, Hayward, CA, 94541
Phone (510) 581-1446
Fax (510) 581-1805
Enumeration date Sep 2, 2006
Last updated in NPPES Sep 29, 2025
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
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.
Frequently asked questions
What specialty is Jerrilyn Johnston?
Jerrilyn Johnston is registered in NPPES with the primary taxonomy of Pediatrics Physician. 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.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-29.