An RN authorized by the Board to practice in an APRN clinical category may be authorized in additional APRN clinical categories in accordance with the requirements for authorization established for each clinical category. A RN authorized in more than one category must comply with the requirements for initial and renewal Board authorization to practice as an APRN for each clinical category, including payment of all initial and renewal fees established by the Executive Office of Administration and Finance for each APRN clinical category in which the RN is authorized.