Depression is the second most common mental health issue in America. Over 18% of U.S. adults currently have it or are being treated for it; a record high (Gallup, 2025). That means clinicians are coding for depression every single day.
And one small coding error can trigger a denied claim, an audit, or a gap in a patient’s medical history. This guide gives you everything you need to diagnose and document everything right the first time.
Understanding the ICD-10 System for Mental Health
ICD-10-CM is the U.S. clinical version of the World Health Organization’s International Classification of Diseases, 10th Revision. Mental and behavioral health codes fall in the F01–F99 range. Depression codes specifically sit within F30–F39, which covers mood disorders.
The Centers for Medicare & Medicaid Services (CMS) and the National Center for Health Statistics (NCHS) manage annual updates. Changes go live every October 1st. For 2025, there were no major revisions to the core depression codes. (Medheave, 2025).
Two things determine which depression code you use:
Episode type — Is this the patient’s first depressive episode, or have they had more than one?
Severity and features — Is the episode mild, moderate, or severe? Are psychotic features present?
Get those two questions answered in your clinical notes, and you’ll almost always land on the right code.
F32 Codes: Major Depressive Disorder, Single Episode
The F32 category is used when the patient has the initial recorded episode of major depressive disorder (MDD). It is the most widespread entry point for making new depression diagnoses.
Here’s the full breakdown:
| F32.0 | MDD, single episode, mild |
| F32.1 | MDD, single episode, moderate |
| F32.2 | MDD, single episode, severe without psychotic features |
| F32.3 | MDD, single episode, severe with psychotic features |
| F32.4 | MDD, single episode, in partial remission |
| F32.5 | MDD, single episode, in full remission |
| F32.9 | MDD, single episode, unspecified |
| F32.A | Depression, unspecified |
No valid codes exist between F32.6 and F32.8 — skip straight from F32.5 to F32.9 (Valant, 2025).
Mild vs. Moderate vs. Severe: What’s the Difference?
This is where many providers get stuck. The clinical distinction matters more than most people realize.
A mild episode (F32.0) means the patient has the minimum number of symptoms needed for an MDD diagnosis. Those symptoms cause only minor interference with daily function. Patients can still go to work. They can still maintain most relationships.
Moderate episode (F32.1) implies that there are additional symptoms, and the functioning is significantly reduced. The patient may be experiencing difficulties in the workplace, avoiding social life, and having insomnia and trouble sleeping.
A minor episode without psychosis (F32.2) is also highly disabling. The patient might not even be capable of working or even taking care of himself.
An acute episode of psychotic nature (F32.3) includes delusions or hallucinations of an image.
Your clinical documentation needs to support whichever code you select. If it doesn’t, downcode to F32.9 — but make a note that you’ll reassess at the next visit.
F33 Codes: Major Depressive Disorder, Recurrent
Once a patient has had two or more separate depressive episodes – with at least two months of significant recovery between them; you move from F32 to F33. This distinction is critical for proper billing and care planning.
| F33.0 | MDD, recurrent, mild |
| F33.1 | MDD, recurrent, moderate |
| F33.2 | MDD, recurrent, severe without psychotic features |
| F33.3 | MDD, recurrent, severe with psychotic features |
| F33.40 | MDD, recurrent, in remission, unspecified |
| F33.41 | MDD, recurrent, in partial remission |
| F33.42 | MDD, recurrent, in full remission |
| F33.9 | MDD, recurrent, unspecified |
Here’s a practical scenario. You’re seeing a 42-year-old woman who had her first depressive episode six years ago. She recovered, went off medication, and functioned well for three years. Now she’s back with the same symptoms; low mood, fatigue, poor concentration, sleep disruption. She meets the criteria at a moderate level of severity. The correct code is F33.1.
According to Headway’s Clinical Lead of Medical Billing and Auditing, your documentation should explicitly support the recurrence. A phrase like “patient’s second depressive episode in six years” in your clinical note goes a long way toward justifying the F33 category over F32 (Headway, 2023).
Beyond MDD: Other Depression ICD-10 Codes
Major depressive disorder isn’t the only way depression shows up in clinical practice. You’ll regularly encounter these other diagnoses—and each needs its own specific code.
Dysthymia / Persistent Depressive Disorder — F34.1
Dysthymia is a chronic, low-level depression lasting at least two years. It never quite reaches the severity of a full MDD episode, but it never fully goes away either. Patients often describe it as “always feeling a little off.”
Code this as F34.1. Another notable heads-up: dysthymia and chronic MDD were combined into one category called Persistent Depressive Disorder in the DSM-5. However, they are still subdivided in ICD-10-CM. (TheraPlatform, 2024).
Postpartum Depression — F53.0
Postpartum depression affects 10–15% of mothers every year, and symptoms persist beyond six months in up to half of those cases (TheraPlatform, 2024). Code it as F53.0 — Puerperal depression.
Don’t mix this up with the “baby blues.” The baby blues experienced by up to 70% of new mothers; resolve on their own within two weeks. They don’t require a code. Postpartum depression is clinically distinct, more severe, and persistent enough to require diagnosis and treatment.
Adjustment Disorder With Depressed Mood — F43.21
Sometimes depression is clearly tied to a specific stressor — a job loss, a divorce, a serious illness diagnosis. When the depressive symptoms don’t meet full MDD criteria and are traceable to an external cause, use F43.21.
The key differentiator here is timeline and causality. Symptoms of adjustment disorder typically improve within 6 months. MDD is independent of external causes and persists regardless of any other factors.
Seasonal Affective Disorder — F33.9
Seasonal Affective Disorder (SAD) has no dedicated ICD-10 code. Most clinicians code it as F33.9 i.e. MDD, recurrent, unspecified and note the seasonal specifier in the clinical documentation. Since SAD is recurrent (it recurs each year), the F33 category is the right home for it.
Five Coding Mistakes You Need To Stop Making
Even careful coders slip up here. These are the most common errors — and how to fix them.
Defaulting to F32.9 out of habit. Unspecified codes are last resorts, not shortcuts. Document severity so you can use a specific code.
Using F32 for a patient with a history of prior episodes. Always review the intake history. Two episodes means F33, not F32.
Forgetting remission codes. A patient on maintenance medication in full remission gets F33.42 — not an active severity code.
Billing depression without supporting documentation. If the note doesn’t describe symptoms, duration, and functional impact, the code is unsupported.
Confusing F32.A with F32.9. F32.9 means confirmed MDD with unspecified severity. F32.A means depression is present, but MDD hasn’t been confirmed yet.
Quick-Reference Code Summary
F32.0 – F32.5 → MDD, single episode (mild through full remission)
F32.9 → MDD, single episode, unspecified
F32.A → Depression, unspecified (not confirmed as MDD)
F33.0 – F33.3 → MDD, recurrent (mild through severe with psychosis)
F33.40 – F33.42 → MDD, recurrent, in remission
F33.9 → MDD, recurrent, unspecified / Seasonal Affective Disorder
F34.1 → Dysthymia / Persistent Depressive Disorder
F43.21 → Adjustment disorder with depressed mood
F53.0 → Postpartum (puerperal) depression
To see the official full list of codes with clinical descriptions, go to the ICD-10-CM code browser at ICD10Data. To update every year, we recommend visiting the CMS ICD-10 resource page each September to ensure you are updated before October 1st.
Coding for depression doesn’t have to be a guessing game. Know your episode type, document your severity, and match the code to the clinical picture in front of you. That’s all it takes to get it right every time; and to give your patients the accurate, complete records they deserve.
Frequently Asked Questions
What is the ICD-10 code for depression, unspecified?
There are two options. Use F32.9 when you’ve confirmed MDD but haven’t documented the severity level. Use F32. A when depression is present but hasn’t yet been confirmed as meeting the full criteria for MDD.
What’s the difference between F32 and F33 depression codes?
F32 codes are for a patient’s first or single depressive episode. F33 codes apply when a patient has had two or more distinct depressive episodes with a significant period of recovery in between. The recurrence history in your clinical notes is what justifies the switch from F32 to F33.
Is postpartum depression coded differently from regular depression?
Yes. Postpartum depression uses F53.0 — Puerperal depression, which is a distinct category from the F32 and F33 MDD codes. The “baby blues” that many new mothers experience do not require a diagnostic code.
Can I bill for depression and anxiety at the same visit?
Yes, as long as both diagnoses are clinically supported and documented in the visit notes. Depression (F32. x or F33.x) and anxiety disorder codes (F41.x) can coexist on the same claim when the patient meets criteria for both.
Did any depression ICD-10 codes change for 2025?
No major changes were made to F32 or F33 codes for the 2025 cycle. The 2025 updates, effective October 1, 2024, focused on other areas of behavioral health coding. The core depression codes remain consistent with the prior year.
