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ICD-10-CM 2027 diagnosis code

F04Amnestic disorder due to known physiological condition

✓ Billable / specific

F04 is a valid, billable ICD-10-CM code for amnestic disorder due to known physiological condition. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Amnesic syndrome, ICD-10 code for Meynert's amentia, ICD-10 code for Korsakoff syndrome, ICD-10 code for Toxemica cerebropathia psychica.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About F04

F04 is the ICD-10-CM diagnosis code for amnestic disorder due to known physiological condition. It belongs to block F01-F09 (mental disorders due to known physiological conditions) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report F04 together with the conditions in its Excludes1 note: amnesia NOS (R41.3), anterograde amnesia (R41.1), dissociative amnesia (F44.0) and retrograde amnesia (R41.2).

The conditions in its Excludes2 note aren't part of F04, but may be coded alongside it if the patient has both: alcohol-induced or unspecified Korsakov's syndrome (F10.26, F10.96) and Korsakov's syndrome induced by other psychoactive substances (F13.26, F13.96, F19.16, F19.26, F19.96).

Code first: the underlying physiological condition.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 884 (Organic Disturbances and Intellectual Disability, relative weight 1.6001), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 294.0 (amnestic disorder in conditions classified elsewhere).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Korsakov's psychosis or syndrome, nonalcoholic
Excludes1Not coded here — never report together with this code
  • amnesia NOS (R41.3)
  • anterograde amnesia (R41.1)
  • dissociative amnesia (F44.0)
  • retrograde amnesia (R41.2)
Excludes2Not included here — may be reported together if both conditions exist
Code firstSequence the underlying condition first
  • the underlying physiological condition

Notes that apply from higher levels

Instructions written at a parent level also apply to F04.

Broader instructions also apply from F01-F09 Mental disorders due to known physiological conditions and Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

Alphabetic index entries

12 entries

Terms in the official ICD-10-CM index that lead to F04.

Codes whose notes reference F04

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 294.0Amnestic disorder in conditions classified elsewhereapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about F04

Is F04 billable?

Yes. F04 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can F04 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict F04 as a principal diagnosis.

Is F04 a CC or MCC?

No. F04 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does F04 group to?

F04 is used in the MS-DRG v44.0 logic for MS-DRG 884 (Organic Disturbances and Intellectual Disability). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for F04?

The CMS General Equivalence Mappings map F04 to ICD-9-CM 294.0.