NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alan Howard Gruber, MD

Ophthalmology Physician in Rochester, NY · enumerated 2005 · practices at Rochester Ophthalmological Group.

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

National Provider Identifier

1356345839

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Registry record

Entity type Individual (Type 1)
Name Alan Howard Gruber
Credential MD
Sex Male
Practice address 2100 Clinton Ave S, Rochester, NY, 14618
Phone (585) 244-6011
Fax (585) 244-0236
Enumeration date Jun 13, 2005
Last updated in NPPES Aug 20, 2014

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 154919 (NY) 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
00962721 Medicaid NY -
1356345839 Other NY MVP
P010154919 Other NY BCBS
1073577961 Other NY EXCELLUS BCBS
180007722 Other NY RAILROAD MEDICARE

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 Alan Gruber?
Alan Gruber is registered in NPPES with the primary taxonomy of Ophthalmology 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 2014-08-20.