Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Nancy Ann O'Brien, CNM
Midwife in Rohnert Park, CA · enumerated 2008.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1003084245
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Registry record
Entity type Individual (Type 1)
Name Ms. Nancy Ann O'Brien
Credential CNM
Sex Female
Practice address 1370 Medical Center Dr, Rohnert Park, CA, 94928
Phone (707) 584-3528
Fax (707) 584-3924
Enumeration date Feb 11, 2008
Last updated in NPPES Feb 11, 2008
Taxonomy & licenses
CNM · Certified Nurse Midwife: An advanced practice nurse specializing in pregnancy, childbirth, and reproductive care.
About the CNM 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 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 Nancy O'Brien?
Nancy O'Brien is registered in NPPES with the primary taxonomy of Midwife. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Planned Parenthood Golden Gate Clinic/Center · Rohnert Park, CA NPI 1164598058 Eye Care Institute, A Medical Corporation Durable Medical Equipment & Medical Supplies · Rohnert Park, CA NPI 1609932342 Eye Care Institute, A Medical Corporation Ophthalmology Physician · Rohnert Park, CA NPI 1699831115 Christine Gibson Women's Health Nurse Practitioner · Rohnert Park, CA NPI 1003036559 Rona Oughin Registered Nurse · Rohnert Park, CA NPI 1861608796 Northern California Medical Assoc Inc Ophthalmology Physician · Rohnert Park, CA NPI 1467720888
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-11.