PIONEER VALLEY ALLERGY, LLC
NPI 1376435883
Allergy & Immunology in Westfield, MA

Q: What is Pioneer Valley Allergy, LLC's NPI number?

The NPI number for Pioneer Valley Allergy, LLC is 1376435883. It was assigned to this organization in the NPPES registry on July 18, 2025.

Q: What is Pioneer Valley Allergy, LLC's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Active since July 18, 2025

212 SOUTHAMPTON RD UNIT B, WESTFIELD, MA 01085(413) 628-5187(413) 321-0170 Get Directions Write a Review

NPPES record last updated: September 17, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Pioneer Valley Allergy, Llc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

PIONEER VALLEY ALLERGY, LLC (NPI 1376435883) is a healthcare organization registered as an allergy & immunology in Westfield, Massachusetts and active in the NPI registry since July 2025. The organization lists Vanessa L Van Stee, Owner/ao, as its authorized official.

NPPES Registry Identity

NPI1376435883

Entity TypeOrganization

Primary Taxonomy207K00000X

Legal Business NamePIONEER VALLEY ALLERGY, LLC

Location Address212 SOUTHAMPTON RD UNIT BWestfield, MA 01085-1321

Mailing Address212 Southampton Rd Unit BWestfield, MA 01085-1321 · (413) 628-5187

Phone(413) 628-5187

Fax(413) 321-0170

Organization SubpartNo

Authorized OfficialVanessa L Van SteeOwner/ao · (413) 628-5187

Enumeration DateJuly 18, 2025

Last NPPES UpdateSeptember 17, 2025

NPPES CertifiedSeptember 17, 2025

✔ NPI 1376435883 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians

Taxonomy Code207K00000X

Definition

An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.

212 SOUTHAMPTON RD UNIT B, Westfield, MA 01085

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Pioneer Valley Allergy, Llc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to Pioneer Valley Allergy, LLC, which bills Medicare for the services they deliver. Of these, 1 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Vanessa Vanstee, M.D.

Allergy/Immunology

NPI 1528094372

212 SOUTHAMPTON RD UNIT B
Westfield, MA 01085

(413) 628-5187

✔ PECOS✔ Accepts MedicareSame address

Margaret Sharron, NP

Nurse Practitioner

NPI 1477651677

269 LOCUST ST STE 201
Florence, MA 01062

(413) 586-0769

✔ PECOS✔ Accepts Medicare13 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Pioneer Valley Allergy, LLC's NPI number?

The NPI number for Pioneer Valley Allergy, LLC is 1376435883. It was assigned to this organization in the NPPES registry on July 18, 2025.

Where is Pioneer Valley Allergy, LLC located?

Pioneer Valley Allergy, LLC is located at 212 Southampton Rd Unit B, Westfield, MA 01085. The listed phone number is (413) 628-5187.

What is Pioneer Valley Allergy, LLC's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Pioneer Valley Allergy, LLC enrolled in Medicare?

Yes. Pioneer Valley Allergy, LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Pioneer Valley Allergy, LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Pioneer Valley Allergy, LLC, in Allergy/Immunology and Nurse Practitioner. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 1 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Pioneer Valley Allergy, LLC was last updated on September 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.