Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William Lewis Marr IV, PA-C

Medical Physician Assistant in Durango, CO · enumerated 2006 · practices at Total Healthcare.

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

National Provider Identifier

1992801179

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Registry record

Entity type Individual (Type 1)

Name Mr. William Lewis Marr IV

Credential PA-C

Sex Male

Practice address 810 E 3rd St Unit 201, Durango, CO, 81301

Phone (970) 764-1790

Fax (970) 375-7927

Enumeration date Sep 15, 2006

Last updated in NPPES Mar 4, 2025

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA01678 (TX) Secondary

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA.0008209 (CO) Primary

Other identifiers

Identifier	Type	State	Issuer
PA01678	Other	TX	PA STATE LICENSE

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is William Marr?

William Marr is registered in NPPES with the primary taxonomy of Medical Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Kimberly Ayres Registered Dietitian · Durango, CO NPI 1669473161 Charlotte Barry Internal Medicine Physician · Durango, CO NPI 1518968734 Dennis Wales Family Medicine Physician · Durango, CO NPI 1376650408 Holly Mccoy Medical Physician Assistant · Durango, CO NPI 1366811366 Micah Helton Internal Medicine Physician · Durango, CO NPI 1194172379 Total Healthcare Family Medicine Physician · Durango, CO NPI 1144831033 Shona Jones Primary Care Nurse Practitioner · Durango, CO NPI 1417683632

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-04.