Yes. Documentation of >99% or <1% may be used when reporting because an exact BMI percentile value is evident (i.e., 100% or 0%). These examples are not considered ranges or thresholds, which are not permitted when reporting the BMI percentile indicator. Examples of non-permitted ranges and thresholds are "75-80th percentile" and ">90th percentile" because the exact BMI percentile value is not evident.
HEDIS 2014