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

Dr. Thayer A Clark, DNP

Family Nurse Practitioner in Thomaston, CT · enumerated 2018.

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

National Provider Identifier

1477052157

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Registry record

Entity type Individual (Type 1)

Name Dr. Thayer A Clark

Credential DNP

Sex Female

Practice address Thomaston, CT, 06787

Phone (860) 880-8091

Enumeration date Feb 7, 2018

Last updated in NPPES Jun 28, 2019

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

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 7667 (CT) Primary

DNP · Doctor of Nursing Practice: A clinical doctorate for advanced practice nurses. About the DNP 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 1477052157 active?

Yes, as of the latest NPPES snapshot, NPI 1477052157 is active (record last updated 2019-06-28).

How do I verify Thayer Clark's NPI record?

Cross-check NPI 1477052157 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-06-28.