Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Rebecca Alleyne Holtzclaw

Nurse Practitioner in Watertown, MA · enumerated 2016.

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

National Provider Identifier

1043671415

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Registry record

Entity type Individual (Type 1)

Name Rebecca Alleyne Holtzclaw

Sex Female

Practice address 40 Spring St, Watertown, Watertown, MA, 02472

Phone (617) 923-6334

Enumeration date Mar 14, 2016

Last updated in NPPES Mar 14, 2016

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 141869 (MA) 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 1043671415 active?

Yes, as of the latest NPPES snapshot, NPI 1043671415 is active (record last updated 2016-03-14).

How do I verify Rebecca Alleyne Holtzclaw's NPI record?

Cross-check NPI 1043671415 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 2016-03-14.