Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Heidi Ann O'Brien, PA-C
Physician Assistant in Milford, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1417057944
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Registry record
Entity type Individual (Type 1)
Name Mrs. Heidi Ann O'Brien
Credential PA-C
Sex Female
Practice address 115 Water St, Suite 104, Milford, MA, 01757
Phone (508) 482-5411
Fax (508) 482-5417
Enumeration date Sep 24, 2006
Last updated in NPPES Jan 4, 2016
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License AP 1492 (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.
Frequently asked questions
What specialty is Heidi O'Brien?
Heidi 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.
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.
Other providers at this practice address
Browse all → Ralph Cahaly Allergy Physician · Milford, MA NPI 1790778553 Beata E. Kersezti, M.D., P.C. Specialist · Milford, MA NPI 1932326303 Lois Robbins Family Nurse Practitioner · Milford, MA NPI 1609081850 Amos Adelowo Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician · Milford, MA NPI 1841498755 Eddie Michli Urology Physician · Milford, MA NPI 1194924738 Line-Up Services, Inc. In Home Supportive Care Agency · Milford, MA NPI 1255646824 Jacquelyn Marshall Nurse Practitioner · Milford, MA NPI 1376398107
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-01-04.