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

Michael O'Brien, PA

Physician Assistant in Florence, MA · enumerated 2020.

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

National Provider Identifier

1922625185

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Michael O'Brien

Credential PA

Sex Male

Practice address Florence, MA, 01062

Phone (413) 210-8823

Enumeration date Jul 2, 2020

Last updated in NPPES Sep 10, 2025

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 PA200001682 (DC) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 031368 (NY) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA100930 (MA) Primary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 085010117 (IL) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 123128 (IA) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 5601012132 (MI) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 2023043567 (MO) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License C08887 (MD) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 7143 (CT) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA58546 (CA) Secondary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

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 this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Michael O'Brien?

Michael O'Brien is registered in NPPES with the primary taxonomy of Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-10.