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ICD-10-CM 2027 diagnosis code

F06.4Anxiety disorder due to known physiological condition

✓ Billable / specific

F06.4 is a valid, billable ICD-10-CM code for anxiety disorder due to known physiological condition. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 F06.4

F06.4 is the ICD-10-CM diagnosis code for anxiety disorder due to known physiological condition. It belongs to category F06 (other mental disorders due to known physiological condition), 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.

Within F06 (other mental disorders due to known physiological condition), F06.4 is specifically for anxiety disorder due to known physiological condition. Related codes cover psychotic disorder with hallucinations due to known physiological condition (F06.0), Catatonic disorder due to known physiological condition (F06.1), psychotic disorder with delusions due to known physiological condition (F06.2), mood disorder due to known physiological condition (F06.3), mild neurocognitive disorder due to known physiological condition (F06.7) and other specified mental disorders due to known physiological condition (F06.8).

The conditions in its Excludes2 note aren't part of F06.4, but may be coded alongside it if the patient has both: anxiety disorders due to alcohol and other psychoactive substances (F10-F19 with .180, .280, .980) and anxiety disorders, not due to known physiological condition or unspecified (F40.-, F41.-).

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 293.84 (anxiety disorder in conditions classified elsewhere).

Coding notes

Excludes2Not included here — may be reported together if both conditions exist
  • anxiety disorders due to alcohol and other psychoactive substances (F10-F19 with .180, .280, .980)
  • anxiety disorders, not due to known physiological condition or unspecified (F40.-, F41.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to F06.4.

› From F06 Other mental disorders due to known physiological condition
Includes
  • mental disorders due to endocrine disorder
  • mental disorders due to exogenous hormone
  • mental disorders due to exogenous toxic substance
  • mental disorders due to primary cerebral disease
  • mental disorders due to somatic illness
  • mental disorders due to systemic disease affecting the brain
Excludes1
  • unspecified dementia (F03.-)
Excludes2
  • delirium due to known physiological condition (F05)
  • dementia as classified in F01-F02
  • other mental disorders associated with alcohol and other psychoactive substances (F10-F19)
Code first
  • the underlying physiological condition

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

3 entries

Terms in the official ICD-10-CM index that lead to F06.4.

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 →
  • 293.84Anxiety disorder in conditions classified elsewhereexact

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 F06.4

Is F06.4 billable?

Yes. F06.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can F06.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict F06.4 as a principal diagnosis.

Is F06.4 a CC or MCC?

No. F06.4 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does F06.4 group to?

F06.4 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 F06.4?

The CMS General Equivalence Mappings map F06.4 to ICD-9-CM 293.84.