NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Irwin Gross, M.D.

Specialist in Bangor, ME · enumerated 2006.

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

National Provider Identifier

1730109117

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Irwin Gross
Credential M.D.
Sex Male
Practice address 417 State St Ste 439, Bangor, ME, 04401
Phone (207) 561-2400
Fax (207) 990-4848
Enumeration date Jul 20, 2006
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 011973 (ME) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Irwin Gross practice?
The practice location on file with NPPES is in Bangor, ME. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Irwin Gross?
The National Provider Identifier (NPI) for Irwin Gross is 1730109117, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.