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F06.7 vs F09

F06.7 (Mild neurocognitive disorder due to known physiological condition) compared with F09 (Unspecified mental disorder due to known physiological condition), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes should not be reported together because F09’s tabular entry lists F06.7 under Excludes1.

Official rule
What is different?

Title wording and billing status.The titles share “disorder due to known physiological condition”; F06.7 says “Mild neurocognitive” where F09 says “Unspecified mental”. F06.7 is a non-billable header; F09 is billable.

Registry fact

Can these codes be reported together?

No.F09’s entry carries an Excludes1 note covering F06.7: “mild neurocognitive disorder due to known physiological condition (F06.7-)”. Both may be reported only when the documentation shows the two conditions are unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

Yes.F09’s tabular entry: “mild neurocognitive disorder due to known physiological condition (F06.7-)”. The note covers F06.7.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

None.Neither entry carries an Excludes2 note that names the other code. F06.7 carries 3 Excludes2 notes covering other codes; the side-by-side table quotes them.

Official rule

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 F09 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?

Excludes1 — generally not reported together

Excludes1 conflict

F09
Unspecified mental disorder due to known physiological condition
↔
F06.7
Mild neurocognitive disorder due to known physiological condition

What we found

No — do not report together.F09 carries an Excludes1 note covering F06.7: “mild neurocognitive disorder due to known physiological condition (F06.7-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

What to review

Report one of the two. Both may be reported only when the documentation shows the two conditions are unrelated to each other.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes1 note means the two conditions are not ordinarily reported together for the same encounter, because the classification treats them as mutually exclusive forms of the same condition. The documented exception is when the two conditions are unrelated to each other.

Source / rule

CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Official guidance behind these answers

  • Section I.A.12.a — Excludes1 · applies to: Excludes1

    A type 1 Excludes note is a pure excludes note. It means “NOT CODED HERE!” An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition. An exception to the Excludes1 definition is the circumstance when the two conditions are unrelated to each other. If it is not clear whether the two conditions involving an Excludes1 note are related or not, query the provider. For example, code F45.8, Other somatoform disorders, has an Excludes1 note for "sleep related teeth grinding (G47.63)," because "teeth grinding" is an inclusion term under F45.8. Only one of these two codes should be assigned for teeth grinding. However psychogenic dysmenorrhea is also an inclusion term under F45.8, and a patient could have both this condition and sleep related teeth grinding. In this case, the two conditions are clearly unrelated to each other, and so it would be appropriate to report F45.8 and G47.63 together.

    ICD-10-CM Official Guidelines FY2027

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

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
F06.7

Mild neurocognitive disorder due to known physiological condition

F09

Unspecified mental disorder due to known physiological condition

StatusDiffers
F06.7
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: F06.70, F06.71

F09
Billable
Excludes1Differs
F06.7
  • 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.-)
F09
  • mild neurocognitive disorder due to known physiological condition (F06.7-)
  • psychosis NOS (F29)
Excludes2Differs
F06.7
  • 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)
F09

None at this code

Code firstDiffers
F06.7
  • the underlying physiological condition, such as:
  • Alzheimer's disease (G30.-)
F09
  • the underlying physiological condition
CategoryDiffers
F06.7

F06 Other mental disorders due to known physiological condition

F09

Is itself a category

ChapterSame for both

F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99)

IncludesDiffers
F06.7
  • 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
F09
  • Mental disorder NOS due to known physiological condition
  • Organic brain syndrome NOS
  • Organic mental disorder NOS
  • Organic psychosis NOS

No Use additional code, Code also and 7th character note at either code.

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. In a row that differs, notes every code shares are dimmed.

Edit this comparisonCheck a whole claim

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