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Each diagnosis must be coded to the highest level for that code (the maximum number of digits for the code being used). For example, In ICD-9, essential hypertension was coded using 401.0 (malignant), 401.1 (benign), or 401.9 (unspecified). In ICD-10 the code is I10. Essential (primary) hypertension in ICD-9, 401.0 includes “high blood pressure” but does not include elevated blood pressure without a diagnosis of hypertension, which in ICD-10 would be R03.0. Similarly, in ICD-9 the code for diabetes was 250.0, and the fifth digit indicates the type of diabetes (e.g., 250.00 diabetes mellitus type one). In ICD-10 the equivalent code is E10.649. 

Any missing information may be cause for a denial, but the most common missing items are the date of the accident, date of a medical emergency, and date of onset. Be sure to scrutinize all claims for missed fields and required supporting documentation.