Ohio Revised Code Title XIII. Commercial Transactions § 1337.14

(A) A principal who creates a valid durable power of attorney for health care may revoke that instrument or the designation of the attorney in fact under it.

The principal may so revoke at any time and in any manner. The revocation shall be effective when the principal expresses an intention to so revoke, except that, if the principal made the principal's attending physician aware of the durable power of attorney for health care, the revocation shall be effective upon its communication to the attending physician by the principal, a witness to the revocation, or other health care personnel to whom the revocation is communicated by such a witness. Absent actual knowledge to the contrary, the attending physician of the principal and other health care personnel who are informed of the revocation of a durable power of attorney for health care by an alleged witness may rely on the information and act in accordance with the revocation.

(B) Upon the communication as described in division (A) of this section to the attending physician of a principal of the fact that the principal's durable power of attorney for health care has been revoked, the attending physician or other health care personnel acting under the direction of the attending physician shall make the fact a part of the principal's medical record.

(C) Unless the instrument provides otherwise, a valid durable power of attorney for health care revokes a prior, valid durable power of attorney for health care.

(D) Regardless of when the declaration is drafted, the execution of a declaration for mental health treatment does not revoke a valid durable power of attorney for health care. A declaration for mental health treatment executed in accordance with Chapter 2135. of the Revised Code supersedes a valid durable power of attorney for health care with regard to mental health treatment and the designation of a proxy to make decisions regarding mental health treatment.