Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dan E. Williams, PA, PSYD

Medical Physician Assistant in Janesville, WI · enumerated 2006.

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

National Provider Identifier

1801874664

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Registry record

Entity type Individual (Type 1)

Name Dan E. Williams

Credential PA, PSYD

Sex Male

Practice address 3524 E Milwaukee St, Janesville, WI, 53546

Phone (608) 756-7100

Fax (608) 756-4700

Enumeration date Jan 3, 2006

Last updated in NPPES Oct 26, 2016

Taxonomy & licenses

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 8500535 (IL) Secondary

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 3873-23 (WI) Primary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

Other identifiers

Identifier	Type	State	Issuer
1801874664	Other	WI	BCBSWI
1801874664	Medicaid	WI	-
WILLIDAN	Other	WI	MERCYCARE INSURANCE

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 Dan Williams's NPI record?

Cross-check NPI 1801874664 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1801874664 active?

Yes, as of the latest NPPES snapshot, NPI 1801874664 is active (record last updated 2016-10-26).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-26.