Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mario O Belledonne, M.D.

Nephrology Physician in Potomac, MD · enumerated 2006 · practices at Mario O Belledonne PA.

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

National Provider Identifier

1033129457

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Registry record

Entity type Individual (Type 1)

Name Dr. Mario O Belledonne

Credential M.D.

Sex Male

Practice address Potomac, MD, 20854

Phone (301) 605-7878

Fax (301) 605-7878

Enumeration date Aug 8, 2006

Last updated in NPPES Jun 29, 2021

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D23177 (MD) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License D23177 (MD) Secondary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License D0023177 (MD) Secondary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License D23177 (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
3233311100	Medicaid	MD	-
83742	Other	MD	UNITED HEALTH
879065	Other	MD	ALLIANCE PPO
379065	Other	MD	MAMSI, PPO
6009-001	Other	MD	CARE FIRST BLUE CHOICE

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.

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Frequently asked questions

Is NPI 1033129457 active?

Yes, as of the latest NPPES snapshot, NPI 1033129457 is active (record last updated 2021-06-29).

How do I verify Mario Belledonne's NPI record?

Cross-check NPI 1033129457 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Mario O Belledonne PA Internal Medicine Physician · Potomac, MD NPI 1477855823

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-29.