F39
BillableUnspecified mood [affective] disorder
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
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
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. 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.
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.
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