Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dorothy Sliwonik

Certified Registered Nurse Anesthetist in Waterbury, CT · enumerated 2020.

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

National Provider Identifier

1386261949

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Registry record

Entity type Individual (Type 1)

Name Dorothy Sliwonik

Sex Female

Practice address 64 Robbins St, Waterbury, CT, 06708

Phone (203) 573-6000

Enumeration date Jun 30, 2020

Last updated in NPPES Jun 30, 2020

Taxonomy & licenses

367500000X Certified Registered Nurse Anesthetist Physician Assistants & Advanced Practice Nursing Providers · License 000000 (CT) 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

Is NPI 1386261949 active?

Yes, as of the latest NPPES snapshot, NPI 1386261949 is active (record last updated 2020-06-30).

How do I verify Dorothy Sliwonik's NPI record?

Cross-check NPI 1386261949 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 2020-06-30.