Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Thomas Rusnock, DMD

Periodontics in Cambridge, MA · enumerated 2006.

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

National Provider Identifier

1245296037

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Registry record

Entity type Individual (Type 1)

Name Dr. John Thomas Rusnock

Credential DMD

Sex Male

Practice address 1105 Massachusetts Ave, Ste 1e, Cambridge, MA, 02138

Phone (617) 547-0618

Fax (617) 576-3187

Enumeration date Apr 21, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

122300000X Dentist Dental Providers · License 17209 (MA) Secondary

1223P0300X Periodontics Dental Providers · License 17209 (MA) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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

Is NPI 1245296037 active?

Yes, as of the latest NPPES snapshot, NPI 1245296037 is active (record last updated 2025-09-11).

How do I verify John Rusnock's NPI record?

Cross-check NPI 1245296037 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 2025-09-11.