Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Jeffrey Monahan, D.C.
Chiropractor in Diamond Bar, CA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720071962
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Registry record
Entity type Individual (Type 1)
Name Dr. Jeffrey Monahan
Credential D.C.
Sex Male
Practice address 3220 S Brea Canyon Rd, #F, Diamond Bar, CA, 91765
Phone (909) 598-7868
Fax (909) 598-4428
Enumeration date Aug 23, 2005
Last updated in NPPES Nov 30, 2007
Taxonomy & licenses
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders.
About the DC 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 Jeffrey Monahan?
Jeffrey Monahan is registered in NPPES with the primary taxonomy of Chiropractor. 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.
Other providers at this practice address
Browse all → Diamond Bar Medical Group Family Medicine Physician · Diamond Bar, CA NPI 1811013394 Michael Kwok Internal Medicine Physician · Diamond Bar, CA NPI 1881717197 Monahan Chiropractic Corp Chiropractor · Diamond Bar, CA NPI 1366610354 Sdxray & Lab Physiological Laboratory · Diamond Bar, CA NPI 1760706576 Beau Chung General Practice Physician · Diamond Bar, CA NPI 1841746799
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-30.