Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Mark Edwin Williams, PA-C

Medical Physician Assistant in Berlin, MD · enumerated 2008.

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

National Provider Identifier

1861649642

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Registry record

Entity type Individual (Type 1)

Name Mr. Mark Edwin Williams

Credential PA-C

Sex Male

Practice address 9714 Healthway Dr # Drl, Berlin, MD, 21811

Phone (410) 641-3340

Enumeration date Aug 22, 2008

Last updated in NPPES Sep 7, 2011

Taxonomy & licenses

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License C0003723 (MD) Primary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Mark Williams?

The National Provider Identifier (NPI) for Mark Williams is 1861649642, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Williams practice?

The practice location on file with NPPES is in Berlin, MD. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-07.