Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mario E Nicholson, MD

Internal Medicine Physician in Hyattsville, MD · enumerated 2006.

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

National Provider Identifier

1689735144

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Registry record

Entity type Individual (Type 1)

Name Dr. Mario E Nicholson

Credential MD

Sex Male

Practice address 6525 Belcrest Road, Suite 160, Hyattsville, MD, 20782

Phone (301) 209-6155

Fax (301) 209-6206

Enumeration date Dec 12, 2006

Last updated in NPPES Jan 22, 2025

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD21652 (DC) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D41747 (MD) Primary

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

Other identifiers

Identifier	Type	State	Issuer
182511900	Medicaid	MD	-

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 Mario Nicholson?

The National Provider Identifier (NPI) for Mario Nicholson is 1689735144, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mario Nicholson practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-22.