F43.8Other reactions to severe stress

F43.8 is the ICD-10-CM diagnosis code for other reactions to severe stress. It belongs to category F43 (reaction to severe stress, and adjustment disorders), block F40-F48 (anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within F43, choose F43.8 (Other reactions to severe stress) only when documentation doesn't support a more specific option: acute stress reaction (F43.0), post-traumatic stress disorder (PTSD) (F43.1), adjustment disorders (F43.2) and reaction to severe stress, unspecified (F43.9).

To report this condition, pick the subcode that matches the documentation: F43.81 (disorder) and F43.89 (stress).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2023 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 309.89 (other specified adjustment reactions).