NPI Portal NPI Lookup & Verification

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

Dr. Gerald Marti, MD, PHD

Hematology (Internal Medicine) Physician in Potomac, MD · enumerated 2013.

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

National Provider Identifier

1427395300

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Registry record

Entity type Individual (Type 1)
Name Dr. Gerald Marti
Credential MD, PHD
Sex Male
Practice address Potomac, MD, 20854
Phone (301) 706-4399
Enumeration date Jan 11, 2013
Last updated in NPPES Aug 3, 2015

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

Taxonomy & licenses

207RH0000X Hematology (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License D0025897 (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
1064403 Other MD MD STATE MEDICAL LICENCE

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 Gerald Marti?
The National Provider Identifier (NPI) for Gerald Marti is 1427395300, a Type 1 (individual) record in the CMS NPPES registry.
Where does Gerald Marti practice?
The practice location on file with NPPES is in Potomac, MD. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-08-03.