Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gretchen O'Brien, N.P.
Nurse Practitioner in Needham, MA · enumerated 2010.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1013220961
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Registry record
Entity type Individual (Type 1)
Name Gretchen O'Brien
Credential N.P.
Sex Female
Practice address 148 Chestnut St, Needham, MA, 02492
Phone (781) 453-7750
Fax (781) 453-7770
Enumeration date Jul 21, 2010
Last updated in NPPES Feb 1, 2021
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN232134 (MA) Primary
NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority.
About the NP 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.
Frequently asked questions
Is NPI 1013220961 active?
Yes, as of the latest NPPES snapshot, NPI 1013220961 is active (record last updated 2021-02-01).
How do I verify Gretchen O'Brien's NPI record?
Cross-check NPI 1013220961 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-01.