Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Martin Simon Gross, MD

Urology Physician in New Haven, CT · enumerated 2010.

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

National Provider Identifier

1881915833

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Registry record

Entity type Individual (Type 1)

Name Dr. Martin Simon Gross

Credential MD

Sex Male

Practice address 789 Howard Ave, New Haven, CT, 06519

Phone (203) 785-2815

Enumeration date Jun 14, 2010

Last updated in NPPES Aug 6, 2026

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 17624 (NH) Secondary

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 86191 (CT) 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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Martin Gross?

Martin Gross is registered in NPPES with the primary taxonomy of Urology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-08-06.