Amnestic disorder due to known physiological condition
In Mental disorders due to known physiological conditions (F01-F09), chapter 5: Mental, Behavioral and Neurodevelopmental Disorders
- F04 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under F01-F09 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28; it was HCC 52 in V24).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
Also indexed as: Amentia, Meynert's; Amnesic syndrome; Disease, Korsakoff's; Disorder, amnesic, amnestic, due to general medical condition; Korsakoff's disease, nonalcoholic; Meynert's amentia; Psychosis, Korsakoff's, Korsakov's, Korsakow's; Syndrome, Korsakoff; Syndrome, organic, amnesic; Syndrome, Wernicke-Korsakoff; Toxemica cerebropathia psychica; Wernicke-Korsakoff's syndrome or psychosis, nonalcoholic
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Instructional notes
Includes: conditions that are coded here
- Korsakov's psychosis or syndrome, nonalcoholic
Excludes1: not coded here, use a different code
Excludes2: not included here, code separately if applicable
Code first: code the underlying condition first, then this code
- the underlying physiological condition
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers psychological pain disorders, substance use, abuse, dependence and remission, factitious disorder including Munchausen by proxy, and dementia severity.
- Pain disorders related to psychological factors (page 43)
- Mental and behavioral disorders due to psychoactive substance use (page 43)
- Factitious Disorder (page 44)
- Dementia (page 45)
Other codes under F01-F09
Mental disorders due to known physiological conditions (F01-F09)
- F01Vascular dementia
- F02Dementia in other diseases classified elsewhere
- F03Unspecified dementia
- F04Amnestic disorder due to known physiological condition(this code)
- F05Delirium due to known physiological condition
- F06Other mental disorders due to known physiological condition
- F07Personality and behavioral disorders due to known physiological condition
- F09Unspecified mental disorder due to known physiological condition
F04 MS-DRG
As the principal diagnosis, F04 groups to MS-DRG 884 (v44.0).
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
F04 is in Neurocognitive disorders (NVS011, its default category), with 95 codes. Others in it:
- F01.50 Vascular dementia, unspecified severity, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
- F01.511 Vascular dementia, unspecified severity, with agitation
- F01.518 Vascular dementia, unspecified severity, with other behavioral disturbance
- F01.52 Vascular dementia, unspecified severity, with psychotic disturbance
- F01.53 Vascular dementia, unspecified severity, with mood disturbance
- F01.54 Vascular dementia, unspecified severity, with anxiety
- F01.A0 Vascular dementia, mild, without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety
- F01.A11 Vascular dementia, mild, with agitation
Medicare coverage articles listing F04
These 9 Medicare billing and coding articles list F04 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
- Home Health - Psychiatric Care
- MRI and CT Scans of the Head and Neck
- Monitored Anesthesia Care
- Outpatient Psychiatry and Psychology Services
- Outpatient Psychotherapy
- Psychiatric Codes
- Psychiatric Diagnostic Evaluation and Psychotherapy Services
- Psychiatry and Psychology Services
- Psychological and Neuropsychological Tests
Other codes that refer to F04
Notes on these codes point to F04.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Memory
Every day, you have different experiences and you learn new things. Your brain cannot store all of that information, so it has to decide what is worth remembering. Memory is the process of storing and then remembering this information. There are different types of memory. Short-term memory stores information for a few seconds or minutes. Long-term memory stores it for a longer period of time.
Read more about memory on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 294.0 Amnestic disorder in conditions classified elsewhere (approximate)