Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Robert B Gross, OD

Optometrist in Cambridge, MA · enumerated 2006.

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

National Provider Identifier

1245204403

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Registry record

Entity type Individual (Type 1)

Name Robert B Gross

Credential OD

Sex Male

Practice address 77 Mass Ave, Medical E23-2s, Cambridge, MA, 02139

Phone (617) 253-4351

Enumeration date Feb 15, 2006

Last updated in NPPES Nov 16, 2012

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 2913 (MA) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
W16397	Other	MA	BLUE CROSS

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

Is NPI 1245204403 active?

Yes, as of the latest NPPES snapshot, NPI 1245204403 is active (record last updated 2012-11-16).

How do I verify Robert Gross's NPI record?

Cross-check NPI 1245204403 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-11-16.