Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William James Mallon, M.D.

Sports Medicine (Orthopaedic Surgery) Physician in Durham, NC · enumerated 2005.

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

National Provider Identifier

1366437048

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name William James Mallon

Credential M.D.

Sex Male

Practice address 120 William Penn Plz, Durham, NC, 27704

Phone (919) 220-5255

Fax (919) 313-1276

Enumeration date Sep 19, 2005

Last updated in NPPES Jun 21, 2012

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 39019 (NC) Secondary

207XX0005X Sports Medicine (Orthopaedic Surgery) Physician Allopathic & Osteopathic Physicians · License 39019 (NC) 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
8953295	Medicaid	NC	-

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 William Mallon?

The National Provider Identifier (NPI) for William Mallon is 1366437048, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Mallon practice?

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

Other providers at this practice address

Browse all →

Laura Gerstner Physician Assistant · Durham, NC NPI 1376548420 John Lord Primary Podiatric Medicine Podiatrist · Durham, NC NPI 1497748412 Paul Kerner Orthopaedic Surgery Physician · Durham, NC NPI 1639160393 Anne Toohey Rheumatology Physician · Durham, NC NPI 1275524829 Linda Belhorn Rheumatology Physician · Durham, NC NPI 1043201692 Robert Harrell Specialist · Durham, NC NPI 1912998162 Susan Fisher Physician Assistant · Durham, NC NPI 1205817129 Walter Burns Surgery Physician · Durham, NC NPI 1831170323

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-06-21.