F04 vs F44.0
F04 and F44.0 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on F04
dissociative amnesia (F44.0)
F04
Amnestic disorder due to known physiological condition
Billable
- Chapter 5
- Mental, Behavioral and Neurodevelopmental disorders
- Section
- F01-F09
Use when the record says
- Korsakov's psychosis or syndrome, nonalcoholic
Indexed under
- Amnes (t)ic syndrome (post-traumatic)
- Meynert's amentia (nonalcoholic)
- Toxemica cerebropathia psychica (nonalcoholic)
- Amentia › Meynert's
- Disease, diseased › Korsakoff's
F44.0
Dissociative amnesia
Billable
- Chapter 5
- Mental, Behavioral and Neurodevelopmental disorders
- Section
- F40-F48
Indexed under
- Amnesia › dissociative
- Amnesia › hysterical
- Amnesia › psychogenic
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027