Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory P Penning, R.T.(R)(CT)ARRT

Diagnostic Radiology Physician in Santa Rosa, CA · enumerated 2022.

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

National Provider Identifier

1124767330

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Registry record

Entity type Individual (Type 1)

Name Gregory P Penning

Credential R.T.(R)(CT)ARRT

Sex Male

Practice address 30 Mark West Springs Rd, Santa Rosa, CA, 95403

Phone (707) 576-4000

Enumeration date Jun 4, 2022

Last updated in NPPES Jun 4, 2022

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License RHF00097211 (CA) Primary

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

What is the NPI number for Gregory Penning?

The National Provider Identifier (NPI) for Gregory Penning is 1124767330, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gregory Penning practice?

The practice location on file with NPPES is in Santa Rosa, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-04.