Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William Henry Niemeyer III, P.A.-C

Physician Assistant in Avon, CT · enumerated 2006 · practices at Hartford Healthcare Urgent Care Centers, LLC.

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

National Provider Identifier

1861435679

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Registry record

Entity type Individual (Type 1)

Name Mr. William Henry Niemeyer III

Credential P.A.-C

Sex Male

Practice address 385 W Main St, Avon, CT, 06001

Phone (860) 777-1280

Enumeration date Jun 13, 2006

Last updated in NPPES Sep 21, 2020

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA01134 (RI) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 004173 (CT) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 085-001528 (IL) Primary

Other identifiers

Identifier	Type	State	Issuer
004173	Other	CT	CT LIC

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 1861435679 active?

Yes, as of the latest NPPES snapshot, NPI 1861435679 is active (record last updated 2020-09-21).

How do I verify William Niemeyer's NPI record?

Cross-check NPI 1861435679 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Christopher Delgross Medical Physician Assistant · Avon, CT NPI 1225029663 Jessica Grant Medical Physician Assistant · Avon, CT NPI 1376527085 Michael Zerbe Medical Physician Assistant · Avon, CT NPI 1952361453 Lois-Ann Lovelace Medical Physician Assistant · Avon, CT NPI 1710926696 Miriam Wiggins Medical Physician Assistant · Avon, CT NPI 1194753087 Gerald Hussar Physician Assistant · Avon, CT NPI 1295758571 Todd Bickmore Family Medicine Physician · Avon, CT NPI 1952315632 Traci Voss Physician Assistant · Avon, CT NPI 1861591265

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-09-21.