F05 vs R41.0
F05 (Delirium due to known physiological condition) compared with R41.0 (Disorientation, unspecified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. F05 carries an Excludes1 note covering R41.0: “delirium NOS (R41.0)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. R41.0 carries an Excludes1 note covering F05: “delirium due to known physiological condition (F05)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| F05Delirium due to known physiological condition | R41.0Disorientation, unspecified | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Delirium due to known physiological condition is a billable ICD-10-CM diagnosis code (F05). | Disorientation, unspecified is a billable ICD-10-CM diagnosis code (R41.0). |
| Includes | Acute or subacute brain syndrome Acute or subacute confusional state (nonalcoholic) Acute or subacute infective psychosis Acute or subacute organic reaction | Confusion NOS Delirium NOS |
| 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