F43.21 — Adjustment Disorder with Depressed Mood

Clinical Description

F43.21 applies when emotional or behavioral symptoms develop within 3 months of an identifiable stressor, with the predominant presentation being depressed mood. Symptoms must be clinically significant but not meet criteria for MDD or bereavement.

Key Symptoms to Document

When using F43.21, your documentation should reference these symptoms:

• Depressed mood, tearfulness, or hopelessness in response to an identifiable stressor
• Distress out of proportion to the severity of the stressor
• Impairment in social or occupational functioning
• Symptom onset within 3 months of the stressor
• Low motivation or withdrawal from usual activities
• Difficulty coping with daily responsibilities

Common Interventions to Document

Evidence-based interventions typically documented with this diagnosis:

• Supportive psychotherapy
• Brief solution-focused therapy
• Cognitive Behavioral Therapy (CBT) focused on coping skills
• Stress management and problem-solving training
• Crisis intervention if indicated

CPT Code Pairings

Common CPT codes used when billing with F43.21:

• 90791 — Psychiatric diagnostic evaluation
• 90832 — Individual psychotherapy, 30 minutes
• 90834 — Individual psychotherapy, 45 minutes
• 96127 — Brief emotional/behavioral assessment
• 90847 — Family psychotherapy with patient present

Documentation Tips

• Clearly identify the precipitating stressor(s) and document the temporal link — symptoms must begin within 3 months of stressor onset.
• Document why full MDD criteria are not met (e.g., insufficient symptom count or duration).
• Note the expected trajectory: symptoms should resolve within 6 months of stressor termination.
• Record functional impairment to justify clinical significance beyond normal stress reactions.
• If the stressor is ongoing, document why adjustment disorder remains the most appropriate diagnosis.

Differential Diagnosis Considerations

When documenting F43.21, consider and rule out:

• Major depressive disorder, single episode (F32.x)
• Normal grief or bereavement (Z63.4)
• Generalized anxiety disorder (F41.1)
• Post-traumatic stress disorder (F43.10)
• Persistent depressive disorder (F34.1)

Screening Tools

Standardized measures commonly used with this diagnosis:

• PHQ-9 (to rule out MDD)
• Adjustment Disorder New Module (ADNM-20)
• GAD-7 (to screen for comorbid anxiety)
• C-SSRS (Columbia Suicide Severity Rating Scale)