F43.0 — Acute stress reaction
Is F43.0 billable?
Yes — F43.0 is billable for FY2027. F43.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. F43.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.
F43.0 at a glance
| Code | F43.0 |
|---|---|
| Description | Acute stress reaction |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does F43.0 group to?
F43.0 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 880Acute Adjustment Reaction and Psychosocial Dysfunctionmedical
How is F43.0 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to F43.0. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Battle exhaustion
- Combat fatigue
- Shellshock (current)
- Crisis › acute reaction
- Crisis › state
- Delirium, delirious › exhaustion (acute or subacute) (not alcohol- or drug-induced)
- Exhaustion, exhaustive › battle (physical NEC)
- Exhaustion, exhaustive › delirium (physical NEC)
- Exhaustion, exhaustive › psychosis (physical NEC)
- Fatigue › combat
- Fugue › reaction to exceptional stress
- Panic › reaction to exceptional stress (attack) (state)
Inclusion terms
Alternative wording in documentation that is classified to F43.0.
- Acute crisis reaction
- Acute reaction to stress
- Combat and operational stress reaction
- Combat fatigue
- Crisis state
- Psychic shock
Excludes2 — not included here — inherited from Chapter 5
The conditions below are not part of F43.0, but a patient may have both at the same time. When documentation supports it, F43.0 and the excluded code may both be reported.
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
How long has F43.0 existed?
F43.0 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with F43.0?
ICD-10-CM declares these codes mutually exclusive with F43.0 — exactly one of each pair can be correct for a given encounter.