F43.0
Acute stress reaction
F43.0 (also written F430) is a billable ICD-10-CM diagnosis code for acute stress reaction. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 14 codes in category F43 (Reaction to severe stress, and adjustment disorders). The Alphabetic Index lists it under 27 entries. Its coding notes include 1 Excludes2 entry.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Behavioral Health clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026IPF Primary
IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:
| MS-DRG | Description | Factor |
|---|---|---|
| 880 | Acute adjustment reaction & psychosocial dysfunction | 1.08 |
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- disorders of psychological development
Inclusion terms
Conditions classified to this code.
- Acute crisis reaction
- Acute reaction to stress
- Combat and operational stress reaction
- Combat fatigue
- Crisis state
- Psychic shock
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 27 entries
- 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
Show 15 more
- 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)