Major Diagnostic Category (MDC)
The MDC is a category generally based on a single body system or aetiology that is associated with a particular medical speciality. However, records assigned to MDCs 01, 15, 18 and 21 may have principal diagnoses associated with other categories. In AR-DRG Version 6.0, there are 23 MDCs.
Principal diagnosis (PDX)
The diagnosis established after study to be chiefly responsible for occasioning an episode of admitted patient care, an episode of residential care or an attendance at a health care establishment (HDSC 2008).
Unrelated OR DRGs
Patients whose OR procedures are unrelated to the patient’s principal diagnosis are assigned to one of three unrelated OR DRGs:
801A OR Procedures Unrelated to Principal Diagnosis W Catastrophic CC
801B OR Procedures Unrelated to Principal Diagnosis W Severe or Moderate CC
801C OR Procedures Unrelated to Principal Diagnosis W/O CC
Typically, these are patients admitted for a medical treatment; they develop a complication unrelated to the principal diagnosis and later have an OR procedure performed for the secondary diagnosis associated with the complication.
801A OR Procedures Unrelated to Principal Diagnosis W Catastrophic CC
801B OR Procedures Unrelated to Principal Diagnosis W Severe or Moderate CC
801C OR Procedures Unrelated to Principal Diagnosis W/O CC
Typically, these are patients admitted for a medical treatment; they develop a complication unrelated to the principal diagnosis and later have an OR procedure performed for the secondary diagnosis associated with the complication.
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