Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Louis Robert Caplan, MD
Neurology Physician in Boston, MA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1306833561
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Registry record
Entity type Individual (Type 1)
Name Dr. Louis Robert Caplan
Credential MD
Sex Male
Practice address 330 Brookline Ave, Boston, MA, 02215
Phone (617) 632-8911
Fax (617) 632-8920
Enumeration date Oct 4, 2005
Last updated in NPPES Mar 7, 2023
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
Where does Louis Caplan practice?
The practice location on file with NPPES is in Boston, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Louis Caplan?
The National Provider Identifier (NPI) for Louis Caplan is 1306833561, 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 2023-03-07.