Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Louis H Watson, MD
Surgery Physician in Upland, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1730280827
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Registry record
Entity type Individual (Type 1)
Name Dr. Louis H Watson
Credential MD
Sex Male
Practice address 99 N San Antonio Ave, #140, Upland, CA, 91786
Phone (909) 931-1800
Fax (909) 931-1855
Enumeration date Sep 25, 2006
Last updated in NPPES Jun 29, 2011
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 Louis Watson?
Louis Watson is registered in NPPES with the primary taxonomy of Surgery 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 2011-06-29.