Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas P. Butler, M.D.

Medical Oncology Physician in Arlington, VA · enumerated 2006.

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

National Provider Identifier

1548225048

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas P. Butler

Credential M.D.

Sex Male

Practice address 1635 N George Mason Dr, Ste 170, Arlington, VA, 22205

Phone (703) 894-3800

Fax (703) 528-0338

Enumeration date Apr 18, 2006

Last updated in NPPES Jan 9, 2023

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 0101029485 (VA) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 0101029485 (VA) 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

What is the NPI number for Thomas Butler?

The National Provider Identifier (NPI) for Thomas Butler is 1548225048, a Type 1 (individual) record in the CMS NPPES registry.

Where does Thomas Butler practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-01-09.