NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. William S O'Loughlin, DC

Chiropractor in Gaithersburg, MD · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1225127384

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Registry record

Entity type Individual (Type 1)
Name Mr. William S O'Loughlin
Credential DC
Sex Male
Practice address Gaithersburg, MD, 20879
Phone (301) 987-0111
Fax (301) 987-0114
Enumeration date Oct 12, 2006
Last updated in NPPES Dec 16, 2019

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License S01866 (MD) Primary
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders. About the DC credential

Other identifiers

Identifier Type State Issuer
G386 Other - CAREFIRST DC

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.

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Frequently asked questions

What is the NPI number for William O'Loughlin?
The National Provider Identifier (NPI) for William O'Loughlin is 1225127384, a Type 1 (individual) record in the CMS NPPES registry.
Where does William O'Loughlin practice?
The practice location on file with NPPES is in Gaithersburg, MD. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-12-16.