Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Sidney Williams II, D.C.

Chiropractor in Elverson, PA · enumerated 2007 · practices at Twin Valley Upper Cervical Chiropractic, PC.

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

National Provider Identifier

1124175112

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Registry record

Entity type Individual (Type 1)

Name Dr. John Sidney Williams II

Credential D.C.

Sex Male

Practice address 319 Darby Sq, 4225 Main Street, Elverson, PA, 19520

Phone (610) 913-1222

Enumeration date Jan 4, 2007

Last updated in NPPES Dec 16, 2020

Taxonomy & licenses

111N00000X Chiropractor Chiropractic Providers · License DC010660 (PA) Primary

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.

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Frequently asked questions

How do I verify John Williams's NPI record?

Cross-check NPI 1124175112 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1124175112 active?

Yes, as of the latest NPPES snapshot, NPI 1124175112 is active (record last updated 2020-12-16).

Other providers at this practice address

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Noelle Casses-Williams Chiropractor · Elverson, PA NPI 1003963083 Twin Valley Upper Cervical Chiropractic, PC Chiropractor · Elverson, PA NPI 1619342771

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-16.