When a physician sees an OB patient at the hospital for "rule out labor", or hypertension, dehydration, etc...how do you code the visit? Do you use an E/M? which state office or other outpatient visit, or would you use Observation care codes? But how does the doctor determine what is observation and what isn't? If I should use E/M codes do you submit with notes to prove it was a hospital visit and not part of routine obstetrical care or bill with a modifier? I would appreciate any help I can get, this has been a long standing question in the office.