F05 diagnosis code · Billable category · FY2027

F05 Delirium due to known physiological condition

Billable
CC
POA reported

F05 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

Chapter 5 Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
F01-F09 Mental disorders due to known physiological conditions (F01-F09)
F05 Delirium due to known physiological condition

CC / MCC: CC
MS-DRG: 880
HCC V28: –
POA: Reported
Code Editor: Unacceptable PDX
Index entries: 26

Instructions

At F05

Inclusion terms

Acute or subacute brain syndrome
Acute or subacute confusional state (nonalcoholic)
Acute or subacute infective psychosis
Acute or subacute organic reaction
Acute or subacute psycho-organic syndrome
Delirium of mixed etiology
Delirium superimposed on dementia
Sundowning

Excludes1

delirium NOS (R41.0) R41.0

Excludes2

delirium tremens alcohol-induced or unspecified (F10.231, F10.921) F10.231 F10.921

Code first

the underlying physiological condition, such as:
dementia (F03.9-) F03.9

Notes that also apply

Block F01-F09 instructions (Notes 1): printed on the block page.

Chapter 5 instructions (Includes 1, Excludes2 1): printed on the chapter 5 page.

Index entries

Sundowning → F05
Confusion, confusedepileptic → F05
Delirium, delirious (acute or subacute) (not alcohol- or drug-induced)postprocedural (postoperative) → F05
Delirium, delirious (acute or subacute) (not alcohol- or drug-induced)puerperal → F05
Epilepsy, epileptic, epilepsia (attack) (cerebral) (convulsion) (fit) (seizure)twilight → F05
Psychosis, psychoticinfective (acute) (subacute) → F05
Puerperal, puerperium (complicated by, complications)delirium NEC → F05
Twilight stateepileptic → F05
Confusion, confusedacutewith dementia → F05
Delirium, delirious (acute or subacute) (not alcohol- or drug-induced)withdementia → F05
Delirium, delirious (acute or subacute) (not alcohol- or drug-induced)due to (secondary to)general medical condition → F05
Delirium, delirious (acute or subacute) (not alcohol- or drug-induced)due to (secondary to)multiple etiologies → F05
Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)withacute confusional state → F05
Insanity, insaneconfusionalacute or subacute → F05
Psychosis, psychoticconfusionalacute or subacute → F05
Senile, senilitywithacute confusional state → F05
State (of)confusional (psychogenic)epileptic → F05
State (of)twilightepileptic → F05
Syndromepsycho-organic (nonpsychotic severity)acute or subacute → F05
Psychosis, psychoticorganicdue to or associated withepilepsy transient (acute) → F05
Psychosis, psychoticorganicinfectiveacute or subacute → F05
Psychosis, psychoticorganicpost-traumaticacute or subacute → F05
Psychosis, psychoticorganicdue to or associated withtrauma, brain (birth) (from electric current) (surgical)acute or subacute → F05
State (of)confusional (psychogenic)acutewithsenility or dementia → F05
Psychosis, psychoticorganicdue to or associated withdiseaseendocrine or metabolicacute or subacute → F05
Psychosis, psychoticorganicdue to or associated withinfectionbrain (intracranial)acute or subacute → F05

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for F05
CC / MCC	CC
PDX exclusion list	0596 (1 code)
Appendix B	MDC 19 Mental Diseases and Disorders, MS-DRG 880 (Acute Adjustment Reaction and Psychosocial Dysfunction…)
Code Editor	Unacceptable principal diagnosis
POA	Reported
HCC V28	–

CC as a secondary diagnosis, not when the principal diagnosis is on its PDX exclusion list.

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.