OB documentation

I am looking for any help on OB coding.
1) how to determine the appropriate E/M level for billing OB visits for Medicaid patients? The OB flow sheet is completed and there may or may not be any additional notes for the visit.
2) if a dx such as drug abuse was determined on prior visits, do you continue to
use that dx for subsequent visits?

Thanks for any help.

OB documentation

There's nothing special about auditing an OB note: select the level of service based on the history, exam and MDM.

If the only documentation is a single line on the OB prenatal form, it won't be a very high level. If the visit warrants additional history, exam and MDM, perhaps because of drug abuse, diabetes, hypertension, etc, ask the physician to document a more extensive note.