DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

F09 diagnosis code · Billable category · FY2027

F09 Unspecified mental disorder due to known physiological condition

  • Billable
  • Not CC/MCC
  • POA reported

F09 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 5 Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
  2. F01-F09 Mental disorders due to known physiological conditions (F01-F09)
  3. F09 Unspecified mental disorder due to known physiological condition
CC / MCC
Neither
MS-DRG
884, 974-976
HCC V28
–
POA
Reported
Code Editor
–
Index entries
18

Instructions

At F09

Inclusion terms

  • Mental disorder NOS due to known physiological condition
  • Organic brain syndrome NOS
  • Organic mental disorder NOS
  • Organic psychosis NOS
  • Symptomatic psychosis NOS

Excludes1

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

Code first

  • the underlying physiological condition

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

  • Deficiency, deficientcognitive → F09
  • Disorder (of)cognitive → F09
  • Organicbrain syndrome → F09
  • Organicmental disorder → F09
  • Organicpsychosis → F09
  • Psychosis, psychoticorganic → F09
  • Psychosis, psychoticsymptomatic → F09
  • Syndromebrain (nonpsychotic) → F09
  • Disease, diseasedmentalorganic → F09
  • Disorder (of)cognitivedue to (secondary to) general medical condition → F09
  • Disorder (of)mental (or behavioral) (nonpsychotic)organic or symptomatic → F09
  • Syndromebrain (nonpsychotic)with psychosis, psychotic reaction → F09
  • Syndromebrain (nonpsychotic)organic → F09
  • Syndromebrain (nonpsychotic)psycho-organic → F09
  • Syndromeorganicbrain → F09
  • Disorder (of)mental (or behavioral) (nonpsychotic)due to (secondary to)brain disease, damage and dysfunction → F09
  • Disorder (of)mental (or behavioral) (nonpsychotic)due to (secondary to)general medical condition → F09
  • Syndromebrain (nonpsychotic)organicpost-traumatic (nonpsychotic)psychotic → F09

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

Medicare grouping and edits

CMS files for F09
CC / MCCNeither
Appendix BMDC 19 Mental Diseases and Disorders, MS-DRG 884 (Organic Disturbances and Intellectual Disability…); MDC 25 Human Immunodeficiency Virus Infections, MS-DRG 974-976 (HIV with Major Related Condition with MCC…)
Code Editor–
POAReported
HCC V28–

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

Hierarchy