ICD-10-CM 2027
ICD-10 code for Shellshock
From the official ICD-10-CM alphabetic index entry “Shellshock (current)”. Page updated September 29, 2026.
About coding Shellshock
The ICD-10-CM code for Shellshock is F43.0 (Acute stress reaction).
Within F43 (reaction to severe stress, and adjustment disorders), F43.0 is specifically for acute stress reaction. Related codes cover post-traumatic stress disorder (PTSD) (F43.1), adjustment disorders (F43.2), other reactions to severe stress (F43.8) and reaction to severe stress, unspecified (F43.9).
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 880 (Acute Adjustment Reaction and Psychosocial Dysfunction, relative weight 0.9306), 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.
More specific Shellshock codes (official index)
- lasting state
Common questions about Shellshock ICD-10 codes
What is the ICD-10 code for Shellshock?
- F43.0 — Acute stress reaction.
Is F43.0 billable?
- Yes. F43.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F43.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F43.0 as a principal diagnosis.
Is F43.0 a CC or MCC?
- No. F43.0 is neither a CC nor an MCC under MS-DRG v44.0.