Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. Damon N Toczylowski, ACNP

Acute Care Nurse Practitioner in Fairfield, CA · enumerated 2012.

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

National Provider Identifier

1174894612

Verified

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Registry record

Entity type Individual (Type 1)

Name Mr. Damon N Toczylowski

Credential ACNP

Sex Male

Practice address Fairfield, CA, 94535

Phone (707) 423-3400

Enumeration date Jan 13, 2012

Last updated in NPPES Jul 21, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

363LA2100X Acute Care Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 4749-33 (WI) Primary

364SA2100X Acute Care Clinical Nurse Specialist Physician Assistants & Advanced Practice Nursing Providers · License 4749-33 (WI) Secondary

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 Damon Toczylowski?

The National Provider Identifier (NPI) for Damon Toczylowski is 1174894612, a Type 1 (individual) record in the CMS NPPES registry.

Where does Damon Toczylowski practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.