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

Dr. Jon William Mader, M.D.

Q: What is the NPI number for Jon Mader?

The National Provider Identifier (NPI) for Jon Mader is 1255656864, a Type 1 (individual) record in the CMS NPPES registry.

Physical Medicine & Rehabilitation Physician in Leesburg, VA · enumerated 2010.

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

National Provider Identifier

1255656864

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Registry record

Entity type Individual (Type 1)

Name Dr. Jon William Mader

Credential M.D.

Sex Male

Practice address Leesburg, VA, 20176

Phone (703) 840-0665

Fax (571) 346-1924

Enumeration date Apr 7, 2010

Last updated in NPPES Oct 3, 2023

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

Taxonomy & licenses

208100000X Physical Medicine & Rehabilitation Physician Allopathic & Osteopathic Physicians · License 0101259167 (VA) 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
1255656864	Medicaid	VA	-
30016466210001	Medicaid	VA	-

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 Jon Mader?

The National Provider Identifier (NPI) for Jon Mader is 1255656864, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jon Mader practice?

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

Other providers at this practice address

Browse all →

Martin Korkowski Internal Medicine Physician · Leesburg, VA NPI 1801880752 Shahid Siddiqui Internal Medicine Physician · Leesburg, VA NPI 1386662757 Loudoun Medical Group, PC Internal Medicine Physician · Leesburg, VA NPI 1386131936 Loudoun Medical Group, PC Physical Medicine & Rehabilitation Physician · Leesburg, VA NPI 1457028342 Loudoun Medical Group, PC Internal Medicine Physician · Leesburg, VA NPI 1245096718

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-03.