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F39 ICD-10-CM Code: Unspecified mood [affective] disorder

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FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Mood [affective] disorders (F30-F39)

F39

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Unspecified mood [affective] disorder

A mood or emotional disorder that cannot be classified into any specific category of depression, mania, or other mood conditions.

Buddy the Bee presenting code insight

Buddy Insight

Unspecified mood disorder is a broad catch-all code used when a provider documents a mood disturbance without specifying whether it is depressive, bipolar, persistent, or episodic.

CMS-HCC V28

N/A

—

Not mapped

CMS-HCC V24

HCC 59

RAF 0.309

ACA/HHS

N/A

—

Not mapped

ESRD/PACE

HCC 59

RAF 0.066

RXHCC

HCC 132

RAF 0.070

Code Book Path

Official
F3Mood [affective] disorders (F30-F39)
F39Unspecified mood [affective] disorder

Inclusion Terms

Official
  • Affective psychosis NOS

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F39 in this effective period.

Related Child Codes

Official

ICD-10-CM does not list child codes under F39 for this display context.

Includes

Official

ICD-10-CM does not list Includes notes for F39 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for F39 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F39 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F39 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F39 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance
Provider documentation of a mood disorder or mood disturbance
Current symptoms described (depressed mood, elevated mood, irritability, etc.)
Impact on functioning and daily activities
Mental status examination supporting a mood disorder diagnosis

MEAT Support

HCC Buddy guidance
Provider documentation of a mood disorder or mood disturbance
Current symptoms described (depressed mood, elevated mood, irritability, etc.)
Impact on functioning and daily activities
Mental status examination supporting a mood disorder diagnosis

Audit Caution

HCC Buddy guidance
Accepting F39 without querying the provider — this code almost always warrants a provider query for further specification
Assigning F39 when the record contains enough information to support a specific mood disorder code
Using F39 for situational mood changes that do not constitute a clinical mood disorder
Coding F39 from problem list entries without supporting documentation in the current encounter

Common Mistakes

HCC Buddy guidance
F34.9 (Persistent mood disorder, unspecified) — Use F34.9 when chronicity/persistence is documented but the specific type is unclear; F39 is for any mood disorder without specification
F32.9 (Major depressive disorder, single episode, unspecified) — If depression is specified, use the appropriate F32 code rather than F39
F31.9 (Bipolar disorder, unspecified) — If bipolar features are documented, use F31.9 rather than F39
F41.9 (Anxiety disorder, unspecified) — Anxiety disorders are distinct from mood disorders; differentiate based on predominant symptom pattern

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is F39 an HCC code?

Yes. F39 maps to Major Depressive, Bipolar, and Paranoid Disorders under the V24 model but is not retained in V28.

HCC Category Mapping

V24HCC 59, Major Depressive, Bipolar, and Paranoid Disorders
0.309
ESRDHCC 59, Major Depressive, Bipolar, and Paranoid Disorders
0.066
RxHCCHCC 132, Major Depressive Disorder and Other Mood Disorders
0.070

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work F39 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F39

For F39to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

  • MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
  • EEvaluate: test results, medication response, or physical findings reviewed by the provider
  • AAssess: explicit mention in the assessment or plan with acknowledgment of status
  • TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed F39 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F39 is the ICD-10-CM diagnosis code for unspecified mood [affective] disorder. A mood or emotional disorder that cannot be classified into any specific category of depression, mania, or other mood conditions. F39 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering mood [affective] disorders (f30-f39).

Under the older CMS-HCC V24 model, F39 maps to Major Depressive, Bipolar, and Paranoid Disorders (HCC 59) with a community, non-dual, aged base RAF weight of 0.309. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

This is the least specific mood disorder code and should only be used when no other mood disorder code applies. Because F39 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F39 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •This is the least specific mood disorder code and should only be used when no other mood disorder code applies
  • •Encourage provider documentation to specify the type of mood disturbance for more accurate coding

Clinical Significance

Unspecified mood disorder is a broad catch-all code used when a provider documents a mood disturbance without specifying whether it is depressive, bipolar, persistent, or episodic. It maps to HCC 59 under V24 with a 0.309 RAF weight, but its lack of specificity makes it a frequent audit target. This code should prompt a query to the provider to determine the exact nature of the mood disorder.

Documentation Requirements

  • ✓Provider documentation of a mood disorder or mood disturbance
  • ✓Current symptoms described (depressed mood, elevated mood, irritability, etc.)
  • ✓Impact on functioning and daily activities
  • ✓Mental status examination supporting a mood disorder diagnosis
  • ✓Current treatment plan
  • ✓Reason why a more specific mood disorder cannot be identified

Commonly Confused Codes

  • •F34.9 (Persistent mood disorder, unspecified): Use F34.9 when chronicity/persistence is documented but the specific type is unclear; F39 is for any mood disorder without specification
  • •F32.9 (Major depressive disorder, single episode, unspecified): If depression is specified, use the appropriate F32 code rather than F39
  • •F31.9 (Bipolar disorder, unspecified): If bipolar features are documented, use F31.9 rather than F39
  • •F41.9 (Anxiety disorder, unspecified): Anxiety disorders are distinct from mood disorders; differentiate based on predominant symptom pattern

Code Hierarchy

└F39Unspecified mood [affective] disorder
└F39Unspecified mood [affective] disorder

Because F39 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

Work F39 in HCC Buddy

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