F43.12Post-traumatic stress disorder, chronic

F43.12 is the ICD-10-CM diagnosis code for post-traumatic stress disorder, chronic. 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within F43.1 (post-traumatic stress disorder (PTSD)), F43.12 is specifically for post-traumatic stress disorder, chronic. Related codes cover unspecified (F43.10) and acute (F43.11).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 882 (Neuroses Except Depressive, relative weight 0.9952), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 309.81 (Posttraumatic stress disorder).