F99BillableSave
F99 - Mental disorder, not otherwise specified
ICD-10-CM Chapter 5: Mental, Behavioral and Neurodevelopmental disorders · F99 Unspecified mental disorder (F99) · Top-level category · FY2027
Applicable To
Inclusion terms listed under F99 in the ICD-10-CM tabular list.
- Mental illness NOS
Includes, Excludes and Coding Notes
Excludes 1 — Not Coded HereFrom F99
Mutually exclusive: these conditions are never reported together with this code.
- unspecified mental disorder due to known physiological condition (F09)
IncludesFrom Chapter F01-F99
Conditions this code covers.
- disorders of psychological development
Excludes 2 — Not Included HereFrom Chapter F01-F99
Not part of this code; report both codes when the patient has both conditions.
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Inpatient DRG Payments
DRG 8804,906 discharges
Acute Adjustment Reaction And Psychosocial Dysfunction
Avg. Medicare Payment
$7,564
Total Payment$9,825
Patient Responsibility$2,261
Hospital Charge$46,037
Chapter Information
Other categories in this chapter
Codes at the same level as F99
- Vascular dementiaF01
- Dementia in other diseases classified elsewhereF02
- Unspecified dementiaF03
- Amnestic disorder due to known physiological conditionF04
- Delirium due to known physiological conditionF05
- Other mental disorders due to known physiological conditionF06
- Personality and behavioral disorders due to known physiological conditionF07
- Unspecified mental disorder due to known physiological conditionF09
- Alcohol related disordersF10
- Opioid related disordersF11
- Cannabis related disordersF12
- Sedative, hypnotic, or anxiolytic related disordersF13
- Cocaine related disordersF14
- Other stimulant related disordersF15
- Hallucinogen related disordersF16
- Nicotine dependenceF17
- Inhalant related disordersF18
- Other psychoactive substance related disordersF19
- SchizophreniaF20
- Schizotypal disorderF21
- Delusional disordersF22
- Brief psychotic disorderF23
- Shared psychotic disorderF24
- Schizoaffective disordersF25
- Other psychotic disorder not due to a substance or known physiological conditionF28
- Unspecified psychosis not due to a substance or known physiological conditionF29
- Manic episodeF30
- Bipolar disorderF31
- Depressive episodeF32
- Major depressive disorder, recurrentF33
- Persistent mood [affective] disordersF34
- Unspecified mood [affective] disorderF39
- Phobic anxiety disordersF40
- Other anxiety disordersF41
- Obsessive-compulsive disorderF42
- Reaction to severe stress, and adjustment disordersF43
- Dissociative and conversion disordersF44
- Somatoform disordersF45
- Other nonpsychotic mental disordersF48
- Eating disordersF50
31 more in this chapter.