Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Conan Mustain, M.D.

Colon & Rectal Surgery Physician in Oklahoma City, OK · enumerated 2008.

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

National Provider Identifier

1760635890

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Registry record

Entity type Individual (Type 1)

Name Dr. William Conan Mustain

Credential M.D.

Sex Male

Practice address 4205 Mcauley Blvd Ste 301, Oklahoma City, OK, 73120

Phone (405) 936-5718

Fax (405) 936-5719

Enumeration date Nov 3, 2008

Last updated in NPPES Mar 25, 2024

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License R1900 (KY) Secondary

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License E-9260 (AR) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License E-9260 (AR) Secondary

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License 42838 (OK) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
5ZZ13	Other	AR	AR BCBS
209704001	Medicaid	AR	-

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 specialty is William Mustain?

William Mustain is registered in NPPES with the primary taxonomy of Colon & Rectal Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-25.