Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark H Henderson Jr., MD

Orthopaedic Surgery Physician in Leonardtown, MD · enumerated 2005.

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

National Provider Identifier

1902883762

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Registry record

Entity type Individual (Type 1)

Name Mark H Henderson Jr.

Credential MD

Sex Male

Practice address 23000 Moakley St, Suite 102, Leonardtown, MD, 20650

Phone (301) 475-5555

Fax (301) 475-8535

Enumeration date Dec 22, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License D0040288 (MD) 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 Mark Henderson?

The National Provider Identifier (NPI) for Mark Henderson is 1902883762, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Henderson practice?

The practice location on file with NPPES is in Leonardtown, MD. 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 2007-07-08.