ICD-10-CM code F43.20 describes adjustment disorder, unspecified. Maladaptive reaction to an identifiable stressor within three months of onset. It is a billable, specific code valid for claim submission. It is grouped under the “Anxiety, Trauma & Stress-Related Disorders” section of the mental, behavioral, and neurodevelopmental disorders chapter.
When to use F43.20
Use this group for phobias, panic, generalized anxiety, OCD, PTSD, acute and adjustment disorders, and dissociative and somatic symptom disorders. Match the code to the specific syndrome and document the precipitating trigger where relevant. For F43.20 specifically, maladaptive reaction to an identifiable stressor within three months of onset.
Documentation & billing
Document the specific syndrome, severity or frequency, and for trauma- or stress-related codes the precipitating event. For somatic symptom and pain disorders, note the psychological factors involved.
Common pitfalls
- Using unspecified anxiety (F41.9) when criteria for a specific disorder are met.
- Coding PTSD under a generic anxiety or stress code.
- Failing to specify the phobia type (animal, situational, or blood-injection-injury).
Common search terms for F43.20
Clinicians often look up F43.20 using plain-language terms. This code maps to:
Frequently asked questions
What is ICD-10-CM code F43.20?
Adjustment disorder, unspecified. Maladaptive reaction to an identifiable stressor within three months of onset.
Is F43.20 a billable ICD-10-CM code?
Yes. F43.20 (Adjustment disorder, unspecified) is a billable, specific ICD-10-CM code that can be reported on a claim. Confirm the current official descriptor against the CDC code set and your payer’s policies before submitting.
What should I document to support F43.20?
Document the specific syndrome, severity or frequency, and for trauma- or stress-related codes the precipitating event. For somatic symptom and pain disorders, note the psychological factors involved.