Treating a patient with Major Depressive Disorder, Single Episode, Unspecified? F32.9 is a Billable depression code in 2026. You may use it when a single MDD episode is documented but severity is not specified. However, remember that overuse of F32.9 invites audits and claim denials.This blog shall help you understand depression ICD-10 Codes according to different diagnoses, including the ones for postpartum depression and mild depression.
Remember! Unspecified codes are a last resort. If the note documents severity, use the specific code. Thus, do not use F32.9 out of habit.
Depression diagnoses in ICD-10-CM fall under Chapter 5 (Mental, Behavioral and Neurodevelopmental Disorders). Two main groups cover most presentations: F32 for single episodes and F33 for recurrent episodes.
Coding accuracy affects reimbursement, audit risk, and care planning. The 2026 ICD-10-CM edition (effective October 1, 2025) carries no major changes to core F32/F33 codes — but specificity requirements remain strict.
Key Rule: Two or more distinct episodes (separated by ≥2 months of significant recovery) means F33, not F32. Always review intake history before assigning a code.
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Use F32 codes when the patient is experiencing their first documented major depressive episode:
| ICD-10 Code | Diagnosis | Status | Key Conditions to Establish |
|---|---|---|---|
| F32.0 | MDD, Single Episode, Mild (mild depression ICD-10) | Billable | ≥5 DSM-5 symptoms for ≥2 weeks; minimum threshold met; limited functional impairment. PHQ-9 score 5–9. First episode only. |
| F32.1 | MDD, Single Episode, Moderate | Billable | PHQ-9 score 10–14. Moderate functional impairment in work or relationships. Symptoms beyond minimum threshold. First episode. |
| F32.2 | MDD, Single Episode, Severe without Psychotic Features | Billable | PHQ-9 score 15–27. Marked functional impairment. No hallucinations or delusions. Suicidal ideation may be present. First episode. |
| F32.3 | MDD, Single Episode, Severe with Psychotic Features | Billable | Severe depression plus documented delusions or hallucinations. Psychotic symptoms must be present and charted. First episode. |
| F32.4 | MDD, Single Episode, Partial Remission | Billable | Full criteria no longer met, but residual symptoms remain. Significant improvement documented. Ongoing treatment justified. |
| F32.5 | MDD, Single Episode, Full Remission | Billable | No significant symptoms for ≥2 months. Supports continued medication management documentation for insurers. |
| F32.81 | Premenstrual Dysphoric Disorder (PMDD) | Billable | Depressive symptoms consistently in the luteal phase; resolve after menses. Document cyclical pattern, severity, and functional impact. |
| F32.89 | Other Specified Depressive Episodes | Billable | Depressive presentations not captured by other F32 codes. Includes episodes tied to substance use or other conditions. Document why no other code applies. |
| F32.9 | MDD, Single Episode, Unspecified | Billable | Single MDD episode documented; severity not specified. Last resort — always aim for a more specific code. Overuse triggers audits. |
| F32.A | Depression, Unspecified | Billable | Subthreshold depressive symptoms; full MDD criteria not yet met. Common in emergency or first-visit settings before complete history is gathered. PHQ-9 score 5–9. |
Note: No valid codes exist between F32.6 and F32.8. Jump from F32.5 directly to F32.81, then F32.89, then F32.9. Assigning a non-existent code results in claim rejection.
Once a patient has had two or more distinct major depressive episodes (≥2 months of significant recovery between them), all future episodes are coded under F33. Many payers approve more sessions for recurrent diagnoses — this distinction matters.
| ICD-10 Code | Diagnosis | Status | Key Conditions to Establish |
|---|---|---|---|
| F33.0 | MDD, Recurrent, Mild | Billable | ≥2 prior episodes confirmed. Current episode mild (PHQ-9 5–9). Minimal functional impairment. Document prior episode dates. |
| F33.1 | MDD, Recurrent, Moderate | Billable | ≥2 prior episodes. Current episode moderate (PHQ-9 10–14). Difficulty with daily activities. Note recurrence explicitly in clinical documentation. |
| F33.2 | MDD, Recurrent, Severe without Psychotic Features | Billable | ≥2 prior episodes. Severe current episode (PHQ-9 20+). Marked impairment. No psychotic symptoms. Co-administer C-SSRS for suicide risk. |
| F33.3 | MDD, Recurrent, Severe with Psychotic Symptoms | Billable | Recurrent MDD plus documented delusions or hallucinations in current episode. Psychotic features must be charted — not assumed. |
| F33.40 | MDD, Recurrent, In Remission, Unspecified | Billable | Remission confirmed but type (partial vs. full) not documented. Avoid if documentation allows greater specificity. |
| F33.41 | MDD, Recurrent, Partial Remission | Billable | Improved significantly; does not meet full criteria. Residual symptoms present and documented. Ongoing care supported. |
| F33.42 | MDD, Recurrent, Full Remission | Billable | No significant symptoms for ≥2 months. Patients on maintenance medication still receive this code. Justifies continued prescription management. |
| F33.8 | Other Recurrent Depressive Disorders | Billable | Recurrent depressive presentations not captured elsewhere. Document clinical reasoning for code selection. |
| F33.9 | MDD, Recurrent, Unspecified | Billable | Recurrent MDD; severity not documented. Also used for Seasonal Affective Disorder (SAD) — note seasonal patterns in clinical records. Last resort only. |
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Several subtypes have dedicated codes outside the core F32/F33 range. These are among the most searched and most frequently miscoded.
| ICD-10 Code | Diagnosis | Status | Key Conditions to Establish |
|---|---|---|---|
| F34.1 | Dysthymic Disorder / Persistent Depressive Disorder (chronic depression ICD10) | Billable | Depressive symptoms lasting ≥2 years (adults) or ≥1 year (children/adolescents). Milder than MDD but persistent. Symptoms present more days than not. Does not meet full MDD criteria during the 2-year period. |
| F53.0 | Postpartum Depression, Mild–Moderate (postpartum depression ICD10) | Billable | Depression onset within the postpartum period (typically within 4 weeks of delivery; up to 12 months accepted by many payers). Document temporal link to childbirth. Severity must be documented. |
| F53.1 | Puerperal Psychosis | Billable | Severe postpartum psychiatric episode with psychotic features. Coded separately from F53.0. Requires documented hallucinations, delusions, or disorganized behavior in the postpartum period. |
| F43.21 | Adjustment Disorder with Depressed Mood | Billable | Depressive response to an identifiable stressor. Does not meet full MDD criteria. Document the specific stressor and symptom onset within 3 months of stressor. |
| F43.23 | Adjustment Disorder with Mixed Anxiety and Depressed Mood | Billable | Both anxiety and depressive symptoms present; neither meets standalone disorder criteria. Use instead of dual-coding when symptoms overlap substantially. |
| F06.32 | Depressive Disorder Due to Another Medical Condition | Billable | Depression is a direct physiological consequence of a documented medical condition (e.g., hypothyroidism, Parkinson's). Code the underlying condition first. |
| F33.9 | MDD, Recurrent, Unspecified — used for SAD | Billable | Seasonal Affective Disorder has no dedicated ICD-10 code. Code as F33.9 (recurrent, since it returns annually). Note seasonal specifiers in clinical documentation. |
Disclaimer: This blog is only for informational purposes. Verify all codes against the current CMS ICD-10-CM code set and your payer contracts before billing.
Yes, a provider can bill Medicare and Medicaid electronically. The 837 form is a standard format for billing healthcare claims.
Medicare is for people aged 65 or older, so children don’t receive coverage from the Medicare program.
Use CMS form 855 for Medicare and contact your state agency to enroll in the Medicaid program as the provider.
