Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William C Mason MD LLC

Q: What is the NPI number for William C Mason MD LLC?

The NPI for William C Mason MD LLC is 1912252768, a Type 2 (organization) record in the CMS NPPES registry.

Diagnostic Radiology Physician in Carmel, IN · enumerated 2012 · authorized official William Mason, Owner.

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

National Provider Identifier

1912252768

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Registry record

Entity type Organization (Type 2)

Legal business name William C Mason MD LLC

Practice address 12238 Bayhill Dr, Carmel, IN, 46033

Phone (317) 694-0215

Fax (317) 564-8594

Enumeration date Jul 18, 2012

Last updated in NPPES Oct 18, 2016

Taxonomy & classification

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 01036336A (IN) Primary

Authorized official

Name William Mason

Title Owner

Phone (317) 694-0215

Other identifiers

Identifier	Type	State	Issuer
201095210A	Medicaid	IN	-

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 C Mason MD LLC?

The NPI for William C Mason MD LLC is 1912252768, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for William C Mason MD LLC?

NPPES lists William Mason (Owner) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-18.