The number of diagnosis codes has expanded from 13,000 ICD-9 codes to 68,000 ICD-10 codes, with 78 percent of ICD-9 diagnosis codes mapping 1-to-1 with an ICD-10 code, either exactly or approximately.
A California Workers’ Compensation Institute report found medical coding submissions still lack key diagnostic characters, in spite of the move toward increased specificity under ICD-10. California ...