Table 1—

ICD-9-CM diagnosis codes for internalizing and externalizing disorders

Internalizing disorders
Externalizing disorders
DiagnosisICD-9-CM codesDiagnosisICD-9-CM codes
Major depressive disorders296.2x, 296.3xAdjustment reaction, conduct309.3x
Atypical depressive disorder296.82Conduct disorders312.xx
Depressive type psychosis298.0xOppositional disorder313.81
Anxiety states300.0xHyperkinetic syndromes, including ADHD314.xx
Phobic disorders, obsessive-compulsive disorders, neurotic depression300.2x, 300.3x, 300.4x
Adjustment reaction, depressive309.0x, 309.1x
Post-traumatic stress disorder309.81
Depressive disorder, NOS311.xx
Overanxious disorder313.0x
  • ADHD, attention deficit hyperactivity disorder; NOS, not otherwise specified.