2025 ICD-10-CM Diagnosis Code F09

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Unspecified mental disorder due to known physiological condition

  • F09 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Unsp mental disorder due to known physiological condition
  • The 2025 edition of ICD-10-CM F09 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of F09 – other international versions of ICD-10 F09 may differ.

Applicable To

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

Code First

  • the underlying physiological condition

Type 1 Excludes

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

The following code(s) above F09 contain annotation back-references

 that may be applicable to F09:

  • F01-F99  Mental, Behavioral and Neurodevelopmental disorders
  • F01-F09  Mental disorders due to known physiological conditions

Approximate Synonyms

  • Chronic organic brain syndrome
  • Chronic organic mental disorder
  • Cognitive disorder
  • Mental disorder due to medical condition
  • Mild cognitive impairment, so stated
  • Non-psychotic mental disorder
  • Organic brain syndrome
  • Organic mental disorder
  • Specific nonpsychotic mental disorders following organic brain damage
  • Transient organic mental disorder

Clinical Information

  • Broad group of severe mental and behavioral disorders etiologically traceable to brain disease, injury, or toxicosis; psychosis associated with endocrine disorders, drugs, and metabolic or nutritional abnormalities.
  • Cognitive disorders including delirium, dementia, and other cognitive disorders. These may be the result of substance use, trauma, or other causes.
  • What: organic brain syndrome. Organic brain syndrome: either a long term deterioration of intellectual function and memory (dementia) or a short term disturbance of orientation, judgement, or consciousness (delirium). Both may be marked by illusions, hallucinations, delusions, or disturbances of perceptions, mood, behavior, cognitive capacity, or personality. Why: delirium can occur with rheumatic fever or cerebral vasculitis. Both delirium and dementia can occur in systemic lupus erythematosus, and rarely also in mixed connective tissue disease. How: ten or more incorrect responses to the following 30 questions usually means an organic impairment exists. 1) what day of the week is this? 15) the opposite of fast is slow. 2) what month? the opposite of up is? 3) what day of the month? 16) the opposite of large is? 4) what year? 17) the opposite of hard is? 5) what place is this? 18) an orange and a banana are 6) repeat these numbers 8 7 2. Both fruits. A penny and a 7) say them backwards. Dime are both? 8) repeat these numbers 6 3 7 1. 19) red and blue are both? 9) listen to these numbers 6 9 4. 20) what are those words i asked count 1 through 10 out loud, you to remember? (hat) then repeat 6 9 4. (help if 21) (car) needed; then use 5 7 3.) 22) (tree) 10) listen to these numbers 8 1 23) (twenty-six) 4 3. Count 1 through 10 out 24) 100 minus 7 is? loud; then repeat 8 1 4 3. 25) minus 7 is? 11) beginning with sunday, say the 26) minus 7 is? days of the week backwards. 27) minus 7 is? 12) 9 + 3 is? 28) minus 7 is? 13) add 6 (to answer of 12). 29) minus 7 is? 14) take away 5 (from answer of 18). 30) minus 7 is? repeat these words after me and remember them. I will ask for them later. Hat, car, tree, twenty-six. Refs: 1) “organic brain syndromes”. In diagnostic and statistical manual of mental disorders, 3rd ed. (dsm iii). Washington, d.c.: american psychiatric association, 1980. 2) west, nd: “organic brain syndromes”. In psychiatry in primary care medicine (ch. 2). Chicago: year book medical publishers, inc., 1979. 3) sharp, gc: “mixed connective tissue disease and overlap syndromes”. In textbook of rheumatology (ch. 71). Philadelphia: w.b. Saunders co., 1981. 4) bennet, rm and spargo, bh: neuropsychiatric problems in mixed connective tissue disease. Am j med 65(6), december 1978, pp. 955-62. Dn193071. 5) jacobs, et al.: screening for organic mental syndromes in the medically ill. Ann intern med 86(1), january 1977, pp. 40-46. Dn19308-9.

ICD-10-CM F09 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 884 Organic disturbances and intellectual disability
  • 974 Hiv with major related condition with mcc
  • 975 Hiv with major related condition with cc
  • 976 Hiv with major related condition without cc/mcc

Convert F09 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Code annotations containing back-references to F09:

Diagnosis Index entries containing back-references to F09:

  • Deficiency, deficient
    • cognitive F09
  • Disease, diseased – see also Syndrome
    • mentalF99
      • organic F09
  • Disorder (of) – see also Disease
    • cognitive F09
      • due to F09 (secondary to)
    • mental (or behavioral) (nonpsychotic) F99
      • due to (secondary to)
        • brain disease, damage and dysfunction F09
        • general medical condition F09
      • organic or symptomatic F09
  • Organic – see also condition
    • brain syndrome F09
    • mental disorder F09
    • psychosis F09
  • Psychosis, psychoticF29
    • organic F09
    • symptomatic F09
  • Syndrome – see also Disease
    • brain (nonpsychotic) F09
      • organic F09
        • post-traumatic (nonpsychotic) F07.81
          • psychotic F09
      • with psychosis, psychotic reaction F09
      • psycho-organic F09
    • organic
      • brain F09
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