Depression ICD-10 Codes for Therapists: Complete Guide

Depression is the leading cause of disability worldwide, and depressive disorder codes consistently rank among the most-billed in mental health. Getting the coding right matters—for reimbursement, for clinical continuity, and for avoiding the audit flags that come with imprecise billing.

This guide covers the full range of depression-related ICD-10 codes, with attention to the distinctions that matter most: single episode vs. recurrent, severity specifiers, and when to use (or avoid) unspecified codes.

Quick Reference: Depression ICD-10 Codes

Major Depressive Disorder — Single Episode (F32.x)

Major Depressive Disorder — Recurrent (F33.x)

Other Depressive Disorders

Single Episode vs. Recurrent: The Critical Distinction

The most important coding decision for MDD is whether this is a single episode (F32.x) or recurrent (F33.x).

Single episode (F32.x): This is the client's first major depressive episode—they have no history of prior episodes.

Recurrent (F33.x): The client has a history of two or more major depressive episodes, with an intervening period of at least two months without significant depressive symptoms.

Why This Matters

1. Clinical accuracy: Recurrent depression has different treatment implications and prognosis
2. Billing consistency: Switching between single and recurrent codes mid-treatment without justification raises red flags
3. Medical necessity: Recurrent depression supports ongoing treatment and relapse prevention work

Getting History Right

At intake, specifically ask:

• Have you experienced periods of depression before this one?
• When was your first episode of depression?
• Have there been times between episodes when you felt significantly better?

Document the answer. If the client is unclear or you're awaiting records, you can start with single episode and update to recurrent once history is confirmed.

Severity Specifiers

After determining single vs. recurrent, specify severity:

Mild (.0)

• Minimum symptom count (5-6 symptoms)
• Symptoms are distressing but manageable
• Minor impairment in social or occupational functioning
• Client is still functioning, though with difficulty

Moderate (.1)

• More than minimum symptoms
• Intermediate between mild and severe
• Significant impairment in functioning
• This is the most commonly billed severity

Severe without Psychotic Features (.2)

• Most or all symptoms present
• Symptoms markedly interfere with functioning
• Unable to maintain work, relationships, or self-care
• No delusions or hallucinations

Severe with Psychotic Features (.3)

• Meets severe criteria plus psychotic symptoms
• May include mood-congruent delusions (worthlessness, guilt, deserved punishment)
• Typically requires psychiatric referral and possible hospitalization

In Remission (.4/.5 or .40/.41/.42)

• Symptoms have substantially resolved
• Client is in maintenance phase of treatment
• Use when continuing treatment for relapse prevention

Primary Depression Codes in Detail

F32.1 — Major Depressive Disorder, Single Episode, Moderate

When to use: First-ever depressive episode with moderate symptom severity.

Documentation requirements:

• Five or more symptoms present for 2+ weeks (per DSM-5)
• At least one symptom is depressed mood OR loss of interest/pleasure
• Symptoms cause clinically significant distress or impairment
• Not attributable to substances or medical conditions
• Confirm no history of prior depressive episodes

Common symptoms to document:

1. Depressed mood most of the day, nearly every day
2. Markedly diminished interest or pleasure
3. Significant weight/appetite changes
4. Insomnia or hypersomnia
5. Psychomotor agitation or retardation
6. Fatigue or loss of energy
7. Feelings of worthlessness or excessive guilt
8. Diminished concentration
9. Recurrent thoughts of death or suicidal ideation

F33.1 — Major Depressive Disorder, Recurrent, Moderate

When to use: Current depressive episode with moderate severity AND history of at least one prior episode.

National ranking: #3 most-billed mental health code.

Documentation requirements:

• Current episode meets MDD criteria
• History of at least one prior episode (document when/how confirmed)
• Intervening period of at least 2 months between episodes
• Moderate severity currently

Why it's so common: Many clients seeking therapy have experienced depression before. By definition, any client with a prior episode who's depressed again is "recurrent."

F34.1 — Dysthymic Disorder (Persistent Depressive Disorder)

When to use: Chronic depressive symptoms lasting 2+ years (1+ year for children/adolescents) that don't meet full MDD criteria.

Clinical picture:

• Depressed mood most of the day, more days than not, for 2+ years
• Plus 2+ of: appetite changes, sleep changes, low energy, low self-esteem, poor concentration, hopelessness
• Never without symptoms for more than 2 months

Key distinction from MDD: Dysthymia is chronic and lower-grade; MDD episodes are more acute and severe but may remit.

F32.9 / F33.9 — Unspecified

When to use: Only when you genuinely cannot determine severity—assessment is incomplete or information is pending.

Once your assessment is complete, you should be able to specify mild, moderate, or severe based on symptom count and functional impairment.

Differential Diagnosis Considerations

Depression vs. Bipolar Depression

Critical distinction: If the client has ANY history of manic or hypomanic episodes, do not use F32.x or F33.x. Bipolar depression requires codes from the F31.x series.

Why it matters: Bipolar depression has different treatment implications—antidepressant monotherapy without mood stabilization can trigger mania.

Questions to ask:

• Have you ever had periods of unusually high energy, decreased need for sleep, racing thoughts, or impulsive behavior?
• Have you ever been diagnosed with bipolar disorder?
• Has anyone ever told you that you seemed "manic" or "hypomanic"?

If there's any history of mania/hypomania, code under bipolar disorder (F31.x), not MDD.

Depression vs. Adjustment Disorder with Depressed Mood

If symptoms are clearly tied to an identifiable stressor and don't meet full MDD criteria, consider F43.21 (adjustment disorder with depressed mood).

Depression vs. Grief

Normal grief following a loss is not MDD. However, MDD can co-occur with grief if:

• Symptoms persist beyond what's culturally expected
• Functional impairment is marked
• Symptoms include worthlessness, suicidal ideation, psychomotor retardation, or psychotic features

Billing Considerations

Severity and Reimbursement

While all severity levels are billable, moderate (F32.1/F33.1) is by far the most common. This makes sense—mild depression may not always prompt treatment-seeking, while severe depression often requires higher levels of care.

That said, code accurately. Don't default to "moderate" if your assessment shows mild or severe.

Remission Codes

Remission codes (.4, .5, .40, .41, .42) are underutilized. If a client's symptoms have substantially resolved but you're continuing treatment for:

• Relapse prevention
• Skill consolidation
• Taper/termination planning

...consider updating to a remission code. This accurately reflects clinical status and supports continued treatment for maintenance purposes.

Episode Progression

It's clinically appropriate for coding to change across treatment:

1. Initial: F32.1 (single episode, moderate)
2. Improvement: F32.4 (single episode, partial remission)
3. Relapse (later): F33.1 (now recurrent, moderate)

Document the rationale for diagnostic changes in your notes.

Documentation Tips

Symptom specificity: Don't just write "depressed mood." Document observable signs and client-reported symptoms: "Client reports persistent low mood, tearfulness most days, difficulty getting out of bed, 3-hour sleep latency, 10-pound weight loss over 6 weeks, passive suicidal ideation without plan."

Functional impairment: Quantify when possible. "Missed 6 days of work this month. Stopped attending weekly church group. Described conflict with spouse due to irritability and withdrawal."

Episode history: "Client reports first depressive episode at age 22, lasting approximately 6 months. Subsequent episodes at ages 28 and 34. Current episode began approximately 2 months ago. Confirms symptom-free periods of 1+ years between episodes."

Severity justification: "Current presentation is moderate based on: 7 of 9 symptoms present, significant occupational impairment, intact self-care with effort."

Accurate depression coding reflects clinical reality—episode history, current severity, treatment phase. Take the time to distinguish single from recurrent, specify severity, and update codes as the clinical picture evolves.