Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Joseph Charles Mares, M.D.
Pediatrics Physician in Downey, CA · enumerated 2009.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1316186323
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Registry record
Entity type Individual (Type 1)
Name Dr. Joseph Charles Mares
Credential M.D.
Sex Male
Practice address 9449 Imperial Hwy Ste 332, Downey, CA, 90242
Phone (562) 657-2141
Enumeration date Feb 13, 2009
Last updated in NPPES Dec 15, 2021
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
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 Joseph Mares?
Joseph Mares 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.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-15.