F43.0 Acute stress reaction

Billable ICD-10-CM code, FY2026.

Applicable to

• Acute crisis reaction
• Acute reaction to stress
• Combat and operational stress reaction
• Combat fatigue
• Crisis state
• Psychic shock

MS-DRG index

Defines the logic of DRG(s) 880 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 308.9 Unspecified acute reaction to stress (approximate)

Code annotations containing back-references to F43.0

Back-references to F43.0

• Type 2 Excludes: F41 Other anxiety disorders ("acute stress reaction (F43.0)")
• Type 1 Excludes: R53.8 Other malaise and fatigue ("combat exhaustion and fatigue (F43.0)")
• Type 1 Excludes: R57 Shock, not elsewhere classified ("psychic shock (F43.0)")

Back-references to F43

• Type 2 Excludes: F93.0 Separation anxiety disorder of childhood ("nonpsychotic mental disorders (F40-F48)")

Diagnosis Index entries for F43.0

• Battle exhaustion
• Combat fatigue
• Crisis › acute reaction
• Crisis › emotional › acute reaction to stress
• Crisis › state (acute reaction)
• Delirium, delirious (acute or subacute) (not alcohol- or drug-induced) › exhaustion
• Disorder (of) › acute › stress
• Disorder (of) › dissociative › brief reactive
• Disorder (of) › stress › acute
• Disturbance (s) › situational (transient) › acute
• Exhaustion, exhaustive (physical NEC) › battle
• Exhaustion, exhaustive (physical NEC) › delirium
• Exhaustion, exhaustive (physical NEC) › psychosis
• Fatigue › combat
• Fugue › reaction to exceptional stress (transient)
• Panic (attack) (state) › reaction to exceptional stress (transient)
• Psychosis, psychotic › exhaustive
• Reaction › combat and operational stress
• Reaction › crisis, acute
• Reaction › stress (severe) › acute (agitation) ("daze") (disorientation) (disturbance of consciousness) (flight reaction) (fugue)
• Shellshock (current)
• Shock › psychic
• Situational › disturbance (transient) › acute
• Situational › reaction › acute
• State (of) › agitated › acute reaction to stress
• State (of) › crisis
• Stupor (catatonic) › reaction to exceptional stress (transient)

Nearby codes

• F43 Reaction to severe stress, and adjustment disorders
• F43.0 Acute stress reaction (this code)
• F43.1 Post-traumatic stress disorder (PTSD)
• F43.10 Post-traumatic stress disorder, unspecified
• F43.11 Post-traumatic stress disorder, acute
• F43.12 Post-traumatic stress disorder, chronic
• F43.2 Adjustment disorders