F32.1

Major depressive disorder, single episode, moderate

Major depressive disorder (MDD), single episode, moderate, is a clinical diagnosis characterized by a period of at least two weeks during which there is either depressed mood or the loss of interest or pleasure in nearly all activities. In a moderate episode, the individual typically exhibits a greater number of symptoms or more significant functional impairment than seen in mild cases, but without the extreme incapacitation or psychotic features often present in severe episodes. Patients often experience significant difficulty in continuing with social, work, or domestic activities, though they may still be able to function at a basic level. The diagnosis requires that the episode is not better explained by a schizoaffective disorder and is not superimposed on schizophrenia, schizophreniform disorder, delusional disorder, or other specified or unspecified schizophrenia spectrum and other psychotic disorders. Additionally, there must be no history of a manic episode or a hypomanic episode.

Clinical Symptoms

  • Depressed mood most of the day, nearly every day (feeling sad, empty, or hopeless)
  • Markedly diminished interest or pleasure in all, or almost all, activities (anhedonia)
  • Significant weight loss when not dieting or weight gain, or decrease or increase in appetite nearly every day
  • Insomnia or hypersomnia nearly every day
  • Psychomotor agitation or retardation nearly every day (observable by others)
  • Fatigue or loss of energy nearly every day
  • Feelings of worthlessness or excessive or inappropriate guilt (which may be delusional)
  • Diminished ability to think or concentrate, or indecisiveness, nearly every day
  • Recurrent thoughts of death (not just fear of dying), recurrent suicidal ideation without a specific plan, or a suicide attempt or a specific plan for committing suicide
  • Social withdrawal and avoidance of interpersonal contact
  • Reduced productivity and difficulty completing routine tasks at work or home

Common Causes

  • Genetic predisposition and family history of mood disorders
  • Neurobiological factors including dysregulation of neurotransmitters such as serotonin, norepinephrine, and dopamine
  • Structural and functional changes in brain regions such as the prefrontal cortex, hippocampus, and amygdala
  • Hypothalamic-pituitary-adrenal (HPA) axis hyperactivity and elevated cortisol levels
  • Significant life stressors such as bereavement, relationship dissolution, or financial hardship
  • History of childhood trauma, abuse, or neglect
  • Chronic medical conditions or chronic pain syndromes
  • Personality traits such as neuroticism or high levels of self-criticism
  • Social isolation and lack of a supportive social network

Documentation & Coding Tips

Distinguish between single and recurrent episodes by reviewing longitudinal history of depressive symptoms and previous treatment response.

Example: Patient presents with first lifetime occurrence of pervasive low mood and anhedonia lasting 6 weeks. No prior history of similar episodes or antidepressant use. MDD, single episode, moderate. Billing Focus: Single episode status. Risk Adjustment: Captures initial incident severity for HCC profiling.

Billing Focus: Single episode status

Document specific PHQ-9 scores to support the moderate severity classification, typically ranging from 10 to 14.

Example: Current PHQ-9 score is 13, consistent with moderate depressive symptoms including sleep disturbance and poor concentration. MDD, single episode, moderate. Billing Focus: Clinical severity level. Risk Adjustment: Justifies higher resource utilization for moderate versus mild disease.

Billing Focus: Clinical severity level

Explicitly state the absence of psychotic features such as hallucinations or delusions to differentiate from severe episodes.

Example: Patient reports significant fatigue and worthlessness but denies any auditory or visual hallucinations; no evidence of delusional thinking. MDD, single episode, moderate. Billing Focus: Exclusion of psychosis (F32.3). Risk Adjustment: Ensures accurate severity tiering for risk-based contracts.

Billing Focus: Exclusion of psychosis (F32.3)

Identify the specific functional impairments caused by the depressive episode, such as occupational or social difficulties.

Example: Patient reports difficulty completing work assignments and withdrawal from family activities due to lack of energy. MDD, single episode, moderate. Billing Focus: Manifestation of symptoms. Risk Adjustment: Documents functional decline relevant to Medicare Advantage risk scoring.

Billing Focus: Manifestation of symptoms

Differentiate from adjustment disorders by assessing the duration and intensity of symptoms beyond an identifiable stressor.

Example: Symptoms of moderate depression have persisted for 3 months, exceeding the typical duration and severity of a localized adjustment reaction. MDD, single episode, moderate. Billing Focus: Differential diagnosis clarity. Risk Adjustment: Major depression carries a higher risk weight than adjustment disorder.

Billing Focus: Differential diagnosis clarity

Document the presence or absence of suicidal ideation to further support the clinical decision-making complexity.

Example: Patient denies active suicidal ideation or intent but expresses frequent feelings of hopelessness. MDD, single episode, moderate. Billing Focus: Medical decision making complexity. Risk Adjustment: Supports complexity of management in the Hierarchical Condition Category model.

Billing Focus: Medical decision making complexity

Relevant CPT Codes