ICD-10 code F32 covers Major Depressive Disorder (MDD), single episode. Choosing the correct F32 subcode — based on severity and features — is essential for accurate billing and demonstrates diagnostic precision to insurers and auditors.
The F32 Subcodes
- F32.0 — Major depressive disorder, single episode, mild. Minimal impairment; client meets criteria but functions in most areas.
- F32.1 — Major depressive disorder, single episode, moderate. Moderate impairment across multiple domains.
- F32.2 — Major depressive disorder, single episode, severe without psychotic features. Significant impairment; suicidality should be assessed and documented.
- F32.3 — Major depressive disorder, single episode, severe with psychotic features. Requires documentation of delusions or hallucinations.
- F32.4 — Major depressive disorder, single episode, in partial remission.
- F32.5 — Major depressive disorder, single episode, in full remission.
- F32.9 — Major depressive disorder, single episode, unspecified. Use only when severity cannot yet be determined.
F32 (Single Episode) vs F33 (Recurrent)
The distinction between F32 and F33 matters for clinical accuracy and insurance processing:
- F32 — Use when this is the client's first or only identifiable depressive episode, with no prior episodes documented in history.
- F33 — Use when the client has had two or more separate depressive episodes (with a period of full remission of at least 2 months between them). F33 has parallel subcodes: F33.0 (mild), F33.1 (moderate), F33.2 (severe without psychotic features), F33.3 (severe with psychotic features), F33.40/F33.41 (remission).
In practice, many clients presenting for therapy have a history of prior episodes. Take a thorough lifetime depression history at intake — it directly affects which code is accurate.
Choosing the Right Severity Specifier
Severity in MDD is determined by the number of symptoms beyond the minimum diagnostic threshold and the degree of functional impairment:
- Mild: few symptoms above threshold; minor functional impact
- Moderate: symptoms between mild and severe; moderate functional impact
- Severe: most or all criteria symptoms; marked functional impairment
Standardized rating scales such as the PHQ-9 support severity documentation: PHQ-9 scores of 5–9 (mild), 10–14 (moderate), 15–19 (moderately severe), 20–27 (severe). Document the score and date in your intake and progress notes.
Why Specificity Matters for Insurance
Insurers process specificity-coded claims more smoothly than unspecified claims. F32.9 (unspecified) is appropriate at the start of treatment when severity is still being assessed, but should be replaced with a severity-specified code within the first few sessions. Persistent use of unspecified codes is a yellow flag in payer audits.
On the Superbill
List the most specific F32 or F33 subcode that your documentation supports. Superbilled lets you enter any ICD-10 code, so you can update the diagnosis code as your clinical picture becomes clearer across sessions.