Guidelines from which agency provide invaluable information for hospital environment controls, especially where infection prevention is concerned?

Severe caries is seen radiographically as a radiolucency that has:

a. penetrated less than halfway through the enamel. b. penetrated over halfway through the enamel but did not reach the DEJ. c. penetrated at or through the DEJ but less than halfway through the dentin toward the pulp. d. penetrated over halfway through the dentin toward the pulp.

Using a CPT manual, select the correct anesthesia code

Anesthesia: General Procedure: Total cystectomy