Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

R. Mark Williams MD Apmc

Otolaryngology Physician in Lake Charles, LA · enumerated 2008 · authorized official Roger Williams, Physician/Owner.

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

National Provider Identifier

1912168014

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Registry record

Entity type Organization (Type 2)

Legal business name R. Mark Williams MD Apmc

Practice address 501 Dr Michael Debakey Dr, Lake Charles, LA, 70601

Phone (337) 477-6172

Fax (337) 477-1422

Enumeration date Jun 20, 2008

Last updated in NPPES Jun 21, 2018

Taxonomy & classification

207Y00000X Otolaryngology Physician Allopathic & Osteopathic Physicians · License 016891 (LA) Primary

Authorized official

Name Roger Williams

Title Physician/Owner

Phone (337) 477-6172

Other identifiers

Identifier	Type	State	Issuer
1366901	Medicaid	LA	-
4369092740	Other	LA	BLUE CROSS BLUE SHIELD

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

Where is R. Mark Williams MD Apmc located?

The practice location on file with NPPES is in Lake Charles, LA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2018-06-21. Verify at npiregistry.cms.hhs.gov.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-21.