ICD-10 Codes for Anxiety and Depression: Therapist Reference Guide
Anxiety and depression are the two most common diagnoses in outpatient mental health — and they’re also among the most frequently miscoded. Using the wrong ICD-10 code can trigger claim denials, audits, or documentation mismatches that create headaches for you and your clients.
This guide covers the ICD-10 codes you’ll use most often for anxiety and depression, how to choose between them, and what your documentation needs to support each one.
ICD-10 Codes for Anxiety Disorders
Generalized Anxiety Disorder
F41.1 — Generalized Anxiety Disorder
The most common anxiety code in outpatient therapy. GAD requires excessive worry occurring more days than not for at least six months, about multiple domains, that the client finds difficult to control. Associated symptoms include fatigue, difficulty concentrating, irritability, muscle tension, and sleep disturbance — at least three for adults.
Document to support F41.1:
Panic Disorder
F41.0 — Panic Disorder
Recurrent unexpected panic attacks followed by at least one month of anticipatory anxiety or significant behavioral change (avoidance). The “unexpected” qualifier matters — if panic attacks are consistently triggered by a specific stimulus, look at specific phobia or social anxiety instead.
Social Anxiety Disorder (Social Phobia)
F40.10 — Social Phobia, Unspecified
F40.11 — Social Phobia, Generalized
Use F40.11 when anxiety spans most social situations. Use F40.10 for more limited social fear (e.g., primarily performance situations). Both require marked fear of scrutiny and significant impairment or distress.
Specific Phobia
F40.218 — Other Specified Phobia (use when no more specific code applies)
F40.241 — Fear of heights
F40.242 — Claustrophobia
F40.240 — Fear of flying
F40.230 — Fear of blood
When a more specific code exists, use it. When it doesn’t, F40.218 covers most presentations.
Agoraphobia
F40.00 — Agoraphobia Without Panic Disorder
F40.01 — Agoraphobia With Panic Disorder
Always specify the presence or absence of panic disorder — they’re distinct clinical presentations with different treatment implications.
Anxiety Disorder, Unspecified
F41.9 — Anxiety Disorder, Unspecified
Appropriate when anxiety clearly causes distress and impairment but doesn’t meet full criteria for a more specific diagnosis — or early in treatment while assessment is still in progress. Revisit and update once your clinical picture is clearer.
ICD-10 Codes for Depressive Disorders
Major Depressive Disorder
MDD coding in ICD-10 uses episode specifiers. You’ll see both single-episode and recurrent-episode codes.
Single Episode:
Recurrent Episodes:
How to choose severity:
Document to support an MDD code:
Persistent Depressive Disorder (Dysthymia)
F34.1 — Persistent Depressive Disorder (Dysthymia)
Depressed mood for most of the day, more days than not, for at least two years (one year for children/adolescents), plus at least two associated symptoms (appetite changes, sleep disturbance, low energy, poor concentration, low self-esteem, hopelessness). The key differentiator from MDD: chronic, lower-level persistence rather than episodic severity.
Clients with dysthymia often don’t identify as “depressed” — they describe it as “just how they are.” Ask about chronicity and baseline mood, not just episodic lows.
Depressive Episode, Unspecified
F32.9 — Major Depressive Disorder, Single Episode, Unspecified
F32.A — Depression, Unspecified (note: code availability varies by system)
Use unspecified codes when a depressive episode is clearly present but you haven’t yet confirmed severity or episode history. These are appropriate for early sessions — update once your assessment is complete.
Adjustment Disorder with Depressed Mood
F43.21 — Adjustment Disorder with Depressed Mood
When depressive symptoms develop in response to an identifiable stressor within three months of its onset, and the reaction is disproportionate or causes significant impairment — but full MDD criteria are not met.
Don’t overuse this code. Adjustment disorder is time-limited by definition and should not persist beyond six months after the stressor resolves. If symptoms persist, reassess for MDD.
Coding Mixed Anxiety and Depression
Many clients present with clinically significant anxiety and depression simultaneously. ICD-10 handles this in a few ways.
Code Both Separately
The most defensible approach for most presentations: use both the relevant anxiety code and the relevant depressive disorder code on the claim. List the primary diagnosis first — the condition most related to your current treatment focus.
Example: Client presents with GAD and moderate MDD. Primary focus is depressive symptoms.
Mixed Anxiety and Depressive Disorder
F41.8 — Other Specified Anxiety Disorder
ICD-10-CM doesn’t have a direct equivalent to ICD-10’s “mixed anxiety and depressive disorder” (F41.2) in the US clinical version. When symptoms of both are present but neither meets full criteria individually, F41.8 with documentation specifying the mixed presentation is the most appropriate option.
ICD-10 Codes Quick Reference: Anxiety & Depression
| Code | Diagnosis |
| F41.1 | Generalized Anxiety Disorder |
| F41.0 | Panic Disorder |
| F40.10 | Social Phobia, Unspecified |
| F40.11 | Social Phobia, Generalized |
| F40.218 | Specific Phobia, Other |
| F40.00 | Agoraphobia Without Panic |
| F40.01 | Agoraphobia With Panic Disorder |
| F41.9 | Anxiety Disorder, Unspecified |
| F32.0 | MDD, Single Episode, Mild |
| F32.1 | MDD, Single Episode, Moderate |
| F32.2 | MDD, Single Episode, Severe |
| F32.9 | MDD, Single Episode, Unspecified |
| F33.0 | MDD, Recurrent, Mild |
| F33.1 | MDD, Recurrent, Moderate |
| F33.2 | MDD, Recurrent, Severe |
| F33.9 | MDD, Recurrent, Unspecified |
| F34.1 | Persistent Depressive Disorder |
| F43.21 | Adjustment Disorder with Depressed Mood |
| F43.23 | Adjustment Disorder with Anxiety |
Documentation Tips for Anxiety and Depression Codes
Be specific about symptoms. “Client reports feeling anxious” doesn’t support F41.1. Document the specific symptoms, their frequency, duration, and functional impact.
Note episode history. For MDD, the single vs. recurrent distinction matters. Ask about prior episodes — including ones the client may not have recognized as depression at the time.
Update codes as your assessment clarifies. It’s appropriate to start with an unspecified code and refine it once you have enough clinical data. Document your reasoning when you update.
Verify current code lists. ICD-10-CM codes update annually. Always confirm codes against your current-year ICD-10-CM manual or a verified billing resource before submitting claims.
For more clinical documentation resources — including progress note templates, CPT code guides, and private practice billing tools — visit the TherapistDesk resource library.
Note: ICD-10-CM codes are updated annually. Always verify against the current code set before use in billing.