Ans: Outpatient Coders are responsible to know and apply special requirements for reporting outpatient facility services. Inpatient hospital coding focuses on a different subset of skills, where coders work with ICD-10-CM and ICD-10-PCS. Many outpatient coders assign diagnosis and procedural codes for physician offices, ambulatory surgery centers, or emergency department (ED) services, whereas inpatient coders assign codes for services provided during a hospital inpatient stay.