F03 vs F05
F03 (Unspecified dementia) compared with F05 (Delirium due to known physiological condition), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. F03 carries an Excludes2 note covering F05: “dementia with delirium or acute confusional state (F05)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| F03Unspecified dementia | F05Delirium due to known physiological condition | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) |
| Definition | Unspecified dementia is a non-billable ICD-10-CM category code (F03). | Delirium due to known physiological condition is a billable ICD-10-CM diagnosis code (F05). |
| Includes | Major neurocognitive disorder NOS Presenile dementia NOS Presenile psychosis NOS Primary degenerative dementia NOS | Acute or subacute brain syndrome Acute or subacute confusional state (nonalcoholic) Acute or subacute infective psychosis Acute or subacute organic reaction |
| Code first | — | the underlying physiological condition, such as: dementia (F03.9-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources