NPI Portal NPI Lookup & Verification

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

Mr. Michael Stephen Sirois, PA-C

Physician Assistant in Lynnfield, MA · enumerated 2011.

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

National Provider Identifier

1528355856

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Registry record

Entity type Individual (Type 1)
Name Mr. Michael Stephen Sirois
Credential PA-C
Sex Male
Practice address Lynnfield, MA, 01940
Phone (781) 599-1998
Fax (781) 599-1221
Enumeration date Jul 7, 2011
Last updated in NPPES Jul 7, 2011

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

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA4069 (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.

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Frequently asked questions

How do I verify Michael Sirois's NPI record?
Cross-check NPI 1528355856 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1528355856 active?
Yes, as of the latest NPPES snapshot, NPI 1528355856 is active (record last updated 2011-07-07).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-07-07.