California Board of Registered Nursing BRN's website. what a NP and CNS are Advanced Practice apply for the PHN certificate http://www.rn.ca.gov/applicants/ad-pract.shtml#np California Board of Registered Nursing http://www.rn.ca.gov/applicants/ad-pract.shtml#phn http://www.rn.ca.gov/applicants/ad-pract.shtml#np http://www.rn.ca.gov/applicants/ad-pract.shtml Board of Registered Nursing (BRN) Board of Registered Nursing Advanced Practice and Certification http://www.rn.ca.gov/applicants/ad-pract.shtml California Board of Registered Nursing Website apply for the PHN certificate California Public Health Nurse Certification California Board of Registered Nursing California Board of Registered Nursing California Board of Registered Nursing