3M Health Information Systems
3M Health Information Systems
APR DRG Classification Data Elements
MDC (Major Diagnostic Category)
Base APR DRG
(316 base APR DRG categories)
Four Severity of Illness Subclasses*
Subclass
Severity
Four Risk of Mortality Subclasses
Subclass
Severity
1
Minor
1
Minor
2
Moderate
2
Moderate
3
Major
3
Major
4
Extreme
4
Extreme
* Severity subclasses have APR DRG weights for each subclass.
1
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Underlying Principle of 3M™ APR DRGs
Severity of illness (SOI) and risk of
mortality (ROM) are dependent on
the patient’s underlying problem.
High severity of illness and risk of
mortality are characterized by multiple
serious diseases and the interaction
among those diseases.
2
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3M™ APR DRG Assignment is Driven by:
Principal diagnosis
Procedures performed
All secondary diagnoses
Age
Gender
3
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Example of Progression of Severity of Illness Subclass
4
Severity
Secondary Diagnosis of
Of Illness
Diabetes Mellitus
1
Minor
Uncomplicated Diabetes (250.0x)
2
Moderate
Diabetes with Renal Manifestation
(250.4x)
3
Major
Diabetes with Ketoacidosis (250.1x)
4
Severe
Diabetes with Hyperosmolar Coma
(250.2x)
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Example of Progression of Risk of Mortality Subclass
Risk of
5
Secondary Diagnosis of
Mortality
1 Minor
Cardiac Arrhythmias
Premature beats (427.60)
2
Moderate
Sinoatrial Node Dysfunction (427.81)
3
Major
4
Severe
Paroxysmal Ventricular Tachycardia
(427.1)
Ventricular Fibrillation (427.41)
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SOI and ROM are Independent
The severity of illness and risk of mortality subclass are
calculated separately and may be different from each other.
 Severity of Illness is a weight base
 ROM is based on many factors including age & gender
Acute
Cholecystitis
SOI = 3
Major severity
of illness
ROM = 1
Low risk of
mortality
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