ICD-10-CM 2027 diagnosis code
F59Unspecified behavioral syndromes associated with physiological disturbances and physical factors
F59 is a valid, billable ICD-10-CM code for unspecified behavioral syndromes associated with physiological disturbances and physical factors. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Unsp behavrl synd assoc w physiol disturb and physcl factors
Looking up by condition? See ICD-10 code for Psychological and behavioral factors affecting medical condition.
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 F59
F59 is the ICD-10-CM diagnosis code for unspecified behavioral syndromes associated with physiological disturbances and physical factors. It belongs to block F50-F59 (behavioral syndromes associated with physiological disturbances and physical factors) 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.
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 887 (Other Mental Disorder Diagnoses, relative weight 1.1139), 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 306.8 (other specified psychophysiological malfunction).
Coding notes
- Psychogenic physiological dysfunction NOS
Notes that apply from higher levels
Instructions written at a parent level also apply to F59.
Broader instructions also apply from Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.
Alphabetic index entries
3 entriesTerms in the official ICD-10-CM index that lead to F59.
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.
MDC 19 · Mental Diseases and Disorders
ICD-9-CM equivalent
Converter →- 306.8Other specified psychophysiological malfunctionapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about F59
Is F59 billable?
- Yes. F59 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F59 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F59 as a principal diagnosis.
Is F59 a CC or MCC?
- No. F59 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does F59 group to?
- F59 is used in the MS-DRG v44.0 logic for MS-DRG 887 (Other Mental Disorder Diagnoses). 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 F59?
- The CMS General Equivalence Mappings map F59 to ICD-9-CM 306.8.