DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

F43 Reaction to severe stress, and adjustment disorders

  • Header · not billable

F43 is not billable. The category heads 14 billable codes in FY2027, grouped under 5 subdivisions.

ICD-10 code by name

What is the ICD-10 code for situational depression?
Situational depression ICD-10 code: F43.21 Adjustment disorder with depressed mood. Alphabetic Index: Depression (acute) (mental)situational → F43.21. Search ICD-10 for situational depression

Where it sits

  1. Chapter 5 Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
  2. F40-F48 Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders (F40-F48)
  3. F43 Reaction to severe stress, and adjustment disorders
Billable codes
14
Subdivisions
5
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
52

Codes in F43

  1. F43.0
    Acute stress reaction
    Billable
    Inclusion terms 6

    Inclusion terms

    • Acute crisis reaction
    • Acute reaction to stress
    • Combat and operational stress reaction
    • Combat fatigue
    • Crisis state
    • Psychic shock
  2. F43.1
    Post-traumatic stress disorder (PTSD) 3 billable codes
    Header
  3. F43.2
    Adjustment disorders
    Header
    Inclusion terms 3, Excludes2 1

    Inclusion terms

    • Culture shock
    • Grief reaction
    • Hospitalism in children

    Excludes2

    • separation anxiety disorder of childhood (F93.0) F93.0
  4. F43.20
    Adjustment disorder, unspecified
    Billable
  5. F43.21
    Adjustment disorder with depressed mood
    Billable
  6. F43.22
    Adjustment disorder with anxiety
    Billable
  7. F43.23
    Adjustment disorder with mixed anxiety and depressed mood
    Billable
  8. F43.24
    Adjustment disorder with disturbance of conduct
    Billable
  9. F43.25
    Adjustment disorder with mixed disturbance of emotions and conduct
    Billable
  10. F43.29
    Adjustment disorder with other symptoms
    Billable
  11. F43.8
    Other reactions to severe stress
    Header
    Inclusion terms 1

    Inclusion terms

    • Other specified trauma and stressor-related disorder
  12. F43.81
    Prolonged grief disorder
    Billable
    Inclusion terms 3

    Inclusion terms

    • Complicated grief
    • Complicated grief disorder
    • Persistent complex bereavement disorder
  13. F43.89
    Other reactions to severe stress
    Billable
  14. F43.9
    Reaction to severe stress, unspecified
    Billable
    Inclusion terms 2

    Inclusion terms

    • Trauma and stressor-related disorder, NOS
    • Unspecified trauma and stressor-related disorder

Sources of each column.

Instructions

Notes that also apply

Chapter 5 instructions (Includes 1, Excludes2 1): printed on the chapter 5 page.

Index entries

  • Battle exhaustion → F43.0
  • Combat fatigue → F43.0
  • Shellshock (current) → F43.0
  • Nostalgia → F43.20
  • Grief → F43.21
  • Stress → F43.9
  • Crisisacute reaction → F43.0
  • Crisisstate (acute reaction) → F43.0
  • Delirium, delirious (acute or subacute) (not alcohol- or drug-induced)exhaustion → F43.0
  • Exhaustion, exhaustive (physical NEC)battle → F43.0
  • Exhaustion, exhaustive (physical NEC)delirium → F43.0
  • Exhaustion, exhaustive (physical NEC)psychosis → F43.0
  • Fatiguecombat → F43.0
  • Fuguereaction to exceptional stress (transient) → F43.0
  • Panic (attack) (state)reaction to exceptional stress (transient) → F43.0
  • Psychosis, psychoticexhaustive → F43.0
  • Reactioncombat and operational stress → F43.0
  • Reactioncrisis, acute → F43.0
  • Shockpsychic → F43.0
  • State (of)crisis → F43.0
  • Stupor (catatonic)reaction to exceptional stress (transient) → F43.0
  • Disorder (of)adjustment (grief) → F43.20
  • Griefreaction → F43.20
  • Depression (acute) (mental)situational → F43.21
  • Disorder (of)bereavement, persistent complex → F43.81
  • Griefcomplicated → F43.81
  • Griefprolonged → F43.81
  • Disorder (of)stress → F43.9
  • Disorder (of)trauma and stressor-related NOS → F43.9
  • Reactionstress (severe) → F43.9
  • Stressreaction → F43.9
  • Crisisemotionalacute reaction to stress → F43.0
  • Disorder (of)acutestress → F43.0
  • Disorder (of)dissociativebrief reactive → F43.0
  • Disorder (of)stressacute → F43.0
  • Disturbance(s)situational (transient)acute → F43.0
  • Reactionstress (severe)acute (agitation) ("daze") (disorientation) (disturbance of consciousness) (flight reaction) (fugue) → F43.0
  • Situationaldisturbance (transient)acute → F43.0
  • Situationalreactionacute → F43.0
  • State (of)agitatedacute reaction to stress → F43.0

12 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy