WESTERN MASSACHUSETTS ALLERGY LLC
NPI 1538863774
Allergy & Immunology in Springfield, MA

Q: What is Western Massachusetts Allergy LLC's NPI number?

The NPI number for Western Massachusetts Allergy LLC is 1538863774. It was assigned to this organization in the NPPES registry on March 30, 2023.

Q: What is Western Massachusetts Allergy LLC's specialty?

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

Active since March 30, 2023

90 CAREW ST UNIT B, SPRINGFIELD, MA 01104(413) 707-6460(413) 707-6440 Get Directions Write a Review

NPPES record last updated: January 25, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jan 25, 2026, Jun 14, 2023, Mar 30, 2023 (3 updates tracked since 2023).

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About Western Massachusetts Allergy Llc NPPES

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

WESTERN MASSACHUSETTS ALLERGY LLC (NPI 1538863774) is a healthcare organization registered as an allergy & immunology in Springfield, Massachusetts and active in the NPI registry since March 2023. The organization lists David Robertson, Owner, as its authorized official.

NPPES Registry Identity

NPI1538863774

Entity TypeOrganization

Primary Taxonomy207K00000X

Legal Business NameWESTERN MASSACHUSETTS ALLERGY LLC

Location Address90 CAREW ST UNIT BSpringfield, MA 01104-3405

Mailing Address90 Carew St Unit BSpringfield, MA 01104-3405 · (413) 707-6460 · Fax (413) 707-6440

Phone(413) 707-6460

Fax(413) 707-6440

Organization SubpartNo

Authorized OfficialDavid RobertsonOwner · (413) 707-6460

Enumeration DateMarch 30, 2023

Last NPPES UpdateJanuary 25, 20263 updates tracked since enumeration

NPPES CertifiedJanuary 25, 2026

✔ NPI 1538863774 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.

90 CAREW ST UNIT B, Springfield, MA 01104

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Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-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)

Western Massachusetts 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 Western Massachusetts Allergy LLC, which bills Medicare for the services they deliver. Of these, 2 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Margaret Bear, FNP

Nurse Practitioner

NPI 1225929722

90 CAREW ST UNIT B
Springfield, MA 01104

(413) 707-6460

✔ PECOS✔ Accepts MedicareSame address

David Robertson, MD

Allergy/Immunology

NPI 1265647945

90 CAREW ST UNIT B
Springfield, MA 01104

(413) 707-6460

✔ PECOS✔ Accepts MedicareSame address

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 Western Massachusetts Allergy LLC's NPI number?

The NPI number for Western Massachusetts Allergy LLC is 1538863774. It was assigned to this organization in the NPPES registry on March 30, 2023.

Where is Western Massachusetts Allergy LLC located?

Western Massachusetts Allergy LLC is located at 90 Carew St Unit B, Springfield, MA 01104. The listed phone number is (413) 707-6460.

What is Western Massachusetts Allergy LLC's specialty?

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

Is Western Massachusetts Allergy LLC enrolled in Medicare?

Yes. Western Massachusetts Allergy LLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Western Massachusetts Allergy LLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Western Massachusetts 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, 2 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 Western Massachusetts Allergy LLC was last updated on January 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.