Alphabetic Index FY2027

F06.8

Other specified mental disorders due to known physiological condition

FY2027Chapter 5: Mental, Behavioral and Neurodevelopmental disorders/F01–F09 Mental disorders due to known physiological conditions

BillableComplete code, valid to report
Care settingsHospice: not accepted as primaryIPF Primary · MS-DRG 884

F06.8 (also written F068) is a billable ICD-10-CM diagnosis code for other specified mental disorders due to known physiological condition. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 12 codes in category F06 (Other mental disorders due to known physiological condition). The Alphabetic Index lists it under 30 entries. Its coding notes include a Code first instruction, 1 Excludes1 entry and 4 Excludes2 entries.

Code first

If the underlying condition listed here is present and known, sequence it first.

Inherited from F06 Other mental disorders due to known physiological condition
  • the underlying physiological condition

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from F06 Other mental disorders due to known physiological condition
  • unspecified dementia (F03.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from F06 Other mental disorders due to known physiological condition
  • 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)
Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Hospice: not accepted as primary

Not accepted as the principal diagnosis on a hospice claim (bill types 081x and 082x). The Integrated OCE returns an edit for this code.
Reason: Supplementary or additional code, not allowed as principal diagnosis.

Source: CMS Integrated Outpatient Code Editor (IOCE) v27.3, effective October 1, 2026, edit 113

IPF Primary

IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:

MS-DRGDescriptionFactor
884Organic disturbances & intellectual disabilities1.08
A principal diagnosis that groups to none of the 19 designated MS-DRGs gets no MS-DRG adjustment. Otherwise the claim still receives the federal per diem base rate and the other adjustments. This code carries a Code first note (see the Code first note). Under CMS’s IPF grouper rules, when a psychiatric code carries a Code first note, the provider follows the instructions in the Tabular List, and the grouper identifies the principal diagnosis as non-psychiatric and searches the secondary codes for a psychiatric code.

Source: CMS IPF PPS FY 2027 final rule (CMS-1847-F), Addendum A; code lists from the CMS MS-DRG Definitions Manual v44, Addendum B-2 (Code First table); effective for discharges on or after October 1, 2026

Includes

Further defines or gives examples of the content of the category.

Inherited from F06 Other mental disorders due to known physiological condition
  • 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
  • mental disorders due to somatic illness
  • mental disorders due to systemic disease affecting the brain
Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • disorders of psychological development

Inclusion terms

Conditions classified to this code.

This code
  • Epileptic psychosis NOS
  • Obsessive-compulsive and related disorder due to a known physiological condition
  • Organic dissociative disorder
  • Organic emotionally labile [asthenic] disorder

Notes

Also from chapter/block level (1 note)
Inherited from F01–F09 Mental disorders due to known physiological conditions
  • This block comprises a range of mental disorders grouped together on the basis of their having in common a demonstrable etiology in cerebral disease, brain injury, or other insult leading to cerebral dysfunction. The dysfunction may be primary, as in diseases, injuries, and insults that affect the brain directly and selectively; or secondary, as in systemic diseases and disorders that attack the brain only as one of the multiple organs or systems of the body that are involved.

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 30 entries

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