Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Roger Thieler, M.D.

Surgery Physician in Orlando, FL · enumerated 2006.

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

National Provider Identifier

1912959735

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Registry record

Entity type Individual (Type 1)

Name Dr. William Roger Thieler

Credential M.D.

Sex Male

Practice address 601 E Rollins Ave, Orlando, FL, 32803

Phone (407) 303-6611

Enumeration date May 17, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License ME19390 (FL) Primary

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

Where does William Thieler practice?

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

What is the NPI number for William Thieler?

The National Provider Identifier (NPI) for William Thieler is 1912959735, a Type 1 (individual) record in the CMS NPPES registry.

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Leslie Mackey Surgical Physician Assistant · Orlando, FL NPI 1619928355 Herly Ramos Surgical Physician Assistant · Orlando, FL NPI 1285688580 Lee Smyk Obstetrics & Gynecology Physician · Orlando, FL NPI 1033158423 Antonio Cunanan Hospitalist Physician · Orlando, FL NPI 1255363651 Christopher Buddendorff Hospitalist Physician · Orlando, FL NPI 1265465603 Gleen Go Hospitalist Physician · Orlando, FL NPI 1083649529 Ramkishan Gummadapu Hospitalist Physician · Orlando, FL NPI 1205845633 Southern Surgical Services, LLC Surgical Physician Assistant · Orlando, FL NPI 1649459389

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.