For example, a certain maize variety grown in a cool climate will need less water per day than the same maize variety grown in a hotter climate. It is therefore useful to take a certain standard crop or reference crop and determine how much water this crop needs per day in the various climatic regions.
An implantable cardioverter defibrillator (ICD) looks very similar to a pacemaker, except that it is slightly larger. It has a generator, one or more leads, and an electrode for each lead. These components work very much like a pacemaker.
A common question for practitioners beginning to bill insurance is, What's the difference between CPT and ICD-9?. CPT stands for Current Procedural Terminology, whereas ICD-9 stands for International Classification of Diseases, volume 9.