Billed Medicare for CPT99213 with dx 765.18, for a new born aged 02 months, insurance denied as dx inconsistent with pt's age, need to know the age criteria for billing the dx.
ICD9 defines what these codes are to be used for and it also defines what is to be considered an "infant"
I typically use this family of codes in the newborn nursery. If I use it after discharge, I use it as a secondary diagnosis, for example, as a reason why I am seeing the baby weekly to monitor weight gain, etc.
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