Rapper Lil Wayne has missed a court date relating to drugs charges in Arizona after undergoing an unspecified medical procedure.The star was due to appear in front of a judge in Yuma County, Arizona on Monday as part of his ongoing legal battle against charges of drug possession.But Lil Wayne - real name Dwayne Carter Jr. - failed to appear, citing treatment for an unnamed medical condition for his absence.Carter Jr. was arrested in January after police officers allegedly discovered a stash of illegal drugs on his tour bus. The Lollipop hitmaker pleaded not guilty to weapons and drug charges in May.He is due back in court in Arizona in October.