Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mary Teresa Maloney O'Donnell, M.D.

Colon & Rectal Surgery Physician in Bethesda, MD · enumerated 2010.

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

National Provider Identifier

1891016135

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Registry record

Entity type Individual (Type 1)

Name Dr. Mary Teresa Maloney O'Donnell

Credential M.D.

Sex Female

Practice address Department of General Surgery 8901 Rockville Pike, Bethesda, MD, 20889

Phone (013) 295-2420

Enumeration date Jun 22, 2010

Last updated in NPPES Mar 26, 2024

Taxonomy & licenses

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License 0101251302 (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

Where does Mary Teresa O'Donnell practice?

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

What is the NPI number for Mary Teresa O'Donnell?

The National Provider Identifier (NPI) for Mary Teresa O'Donnell is 1891016135, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-26.