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ICD-10-CM 2027 diagnosis code

F39Unspecified mood [affective] disorder

✓ Billable / specific

F39 is a valid, billable ICD-10-CM code for unspecified mood [affective] disorder. 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 Mood disorder.

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 F39

F39 is the ICD-10-CM diagnosis code for unspecified mood [affective] disorder. It belongs to block F30-F39 (mood [affective] disorders) 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 885 (Psychoses, relative weight 1.3901), 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 296.90 (unspecified episodic mood disorder).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Affective psychosis NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to F39.

Broader instructions also apply from Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to F39.

Codes whose notes reference F39

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 →
  • 296.90Unspecified episodic mood disorderapproximate

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 F39

Is F39 billable?

Yes. F39 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can F39 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict F39 as a principal diagnosis.

Is F39 a CC or MCC?

No. F39 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does F39 group to?

F39 is used in the MS-DRG v44.0 logic for MS-DRG 885 (Psychoses). 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 F39?

The CMS General Equivalence Mappings map F39 to ICD-9-CM 296.90.