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F05 vs F06.7

F05 (Delirium due to known physiological condition) compared with F06.7 (Mild neurocognitive disorder due to known physiological condition), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because F06.7 lists F05 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

Title wording and billing status.The titles share “due to known physiological condition”; F05 says “Delirium” where F06.7 says “Mild neurocognitive disorder”. F06.7 is a non-billable header; F05 is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.F06.7 lists F05 under Excludes2: “delirium due to known physiological condition (F05)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. F05 carries 1 Excludes1 note and F06.7 carries 10 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.F06.7’s tabular entry: “delirium due to known physiological condition (F05)”. The note covers F05.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

One is a header.F06.7 is a non-billable header, but F05 is not one of its subdivisions.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

F06.7
Mild neurocognitive disorder due to known physiological condition
↔
F05
Delirium due to known physiological condition

What we found

Yes, when both are documented.F06.7 carries an Excludes2 note covering F05: “delirium due to known physiological condition (F05)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

F05Delirium due to known physiological conditionF06.7Mild neurocognitive disorder due to known physiological condition
Billing statusBillableNon-billable header

Report instead: F06.70, F06.71

ClassificationF01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99)F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99)
DefinitionDelirium due to known physiological condition is a billable ICD-10-CM diagnosis code (F05).Mild neurocognitive disorder due to known physiological condition is a non-billable ICD-10-CM category code (F06.7).
Includes
Acute or subacute brain syndrome
Acute or subacute confusional state (nonalcoholic)
Acute or subacute infective psychosis
Acute or subacute organic reaction
mental disorders due to endocrine disorder
mental disorders due to exogenous hormone
mental disorders due to exogenous toxic substance
mental disorders due to primary cerebral disease
Excludes1
delirium NOS (R41.0)
age related cognitive decline (R41.81)
altered mental status (R41.82)
cerebral degeneration (G31.9)
change in mental status (R41.82)
cognitive deficits following (sequelae of) cerebral hemorrhage or infarction (I69.01-I69.11-, I69.21-I69.31-, I69.81- I69.91-)
dementia (F01.-, F02.-, F03.-)
mild cognitive impairment due to unknown or unspecified etiology (G31.84)
neurologic neglect syndrome (R41.4)
personality change, nonpsychotic (F68.8)
unspecified dementia (F03.-)
Excludes2
delirium tremens alcohol-induced or unspecified (F10.231, F10.921)
delirium due to known physiological condition (F05)
dementia as classified in F01-F02
other mental disorders associated with alcohol and other psychoactive substances (F10-F19)
Code first
the underlying physiological condition, such as:
dementia (F03.9-)
the underlying physiological condition, such as:
Alzheimer's disease (G30.-)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources