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

Heather Sinclair

General Practice Registered Nurse in Winthrop, MA · enumerated 2017.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1235644808

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Registry record

Entity type Individual (Type 1)

Name Heather Sinclair

Sex Female

Practice address Winthrop, MA, 02152

Phone (207) 351-5193

Enumeration date Dec 5, 2017

Last updated in NPPES Dec 5, 2017

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

Taxonomy & licenses

163WG0000X General Practice Registered Nurse Nursing Service Providers · License RN2291252 (MA) Primary

Other identifiers

Identifier	Type	State	Issuer
RN2291252	Other	MA	BOARD OF NURSING REGISTERED NURSE

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

How do I verify Heather Sinclair's NPI record?

Cross-check NPI 1235644808 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1235644808 active?

Yes — as of the latest NPPES snapshot, NPI 1235644808 is active (record last updated 2017-12-05).

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2017-12-05.