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The use of Level III codes was discontinued on December 31, 2003, in order to adhere to consistent coding standards. [ 3 ] : 2 Level III codes were different from the modern CPT Category III codes, which were introduced in 2001 to code emerging technology.
To produce lithium 12-hydroxystearate, lithium hydroxide and 12-hydroxystearic acid are combined in an aqueous medium. With vigorous stirring, dilute monohydrate lithium hydroxide is gradually added to a dispersion of the fatty acid in water heated to slightly below boiling. [2]