In 2013, the WCAB held in Athens Administrators v. WCAB (Kite) that an injured worker's disabilities are not required to be combined using the Combined Values Chart (CVC). The WCAB explained that although the AMA guides favor the combined values method, "physicians may, under certain circumstances, employ a different method of determining impairment if they remain within the four corners of the AMA Guides."
For more than 10 years, Kite became shorthand for combining disabilities by simple addition. Although the case is not binding, such addition is a common method accepted for combining an injured worker's disabilities. Over the years, many cases have applied Kite, but none of the cases was binding nor did any fully elaborate on the circumstances when disabilities could be combined by addition, rather than by using the CVC. The cases also largely depended on how well the physicians explained their opinions.