Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marcus D Sizemore, PA

Physician Assistant in Barnsdall, OK · enumerated 2005.

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

National Provider Identifier

1881686186

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Registry record

Entity type Individual (Type 1)

Name Marcus D Sizemore

Credential PA

Sex Male

Practice address 112 N 5th, Barnsdall, OK, 74002

Phone (918) 847-2558

Fax (918) 847-2053

Enumeration date Aug 22, 2005

Last updated in NPPES Mar 31, 2011

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 305 (OK) Primary

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

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Marcus Sizemore?

The National Provider Identifier (NPI) for Marcus Sizemore is 1881686186, a Type 1 (individual) record in the CMS NPPES registry.

Where does Marcus Sizemore practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-31.