Multiple Choice Identify the choice that best completes the statement or answers the question. 17. Category codes in the ICD-9-CM contain a series of how many digit codes?
18. Subcategory codes in the ICD-9-CM contain how many digits?
19. Subclassification codes contain how many digits?
20. What are codes that do not contain all necessary digits called? a. category codes d. valid codes c. truncated codes b. section codes
21. When are subcategory codes used?
22. The ICD-9-CM codebook consists of how many volumes?
23. What does Volume 1 of the ICD-9-CM contain?