ICD10 hard start

My manager is telling me that the ICD 10 will be a "hard start"

meaning on 10.01.2015 you begin using icd10 codes regardless of what dates of service you are billing.

I will still probs be billing august 2015 dates of service at the 10.01.15 date

Do you know if this is true ? where can I find some info on this ?

thx

ICD10 hard start