F06.7 vs G31.9
F06.7 (Mild neurocognitive disorder due to known physiological condition) compared with G31.9 (Degenerative disease of nervous system, 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. F06.7 carries an Excludes1 note covering G31.9: “cerebral degeneration (G31.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Sequencing on the claim
1stG31.9 then F06.7
G31.9 carries a Use Additional Code instruction covering F06.7: “mild neurocognitive disorder due to known physiological condition (F06.7-)”
Side by side
| F06.7Mild neurocognitive disorder due to known physiological condition | G31.9Degenerative disease of nervous system, unspecified | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Mild neurocognitive disorder due to known physiological condition is a non-billable ICD-10-CM category code (F06.7). | Degenerative disease of nervous system, unspecified is a billable ICD-10-CM diagnosis code (G31.9). |
| Includes | 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 | — |
| Use additional code | — | code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify: dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4) dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-) |
| Code first | the underlying physiological condition, such as: Alzheimer's disease (G30.-) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources