ICD-10 Codes for Depression: Complete Guide to Diagnosis, Documentation, and Billing

ICD-10 codes for depression are organized in three families. F32 codes a single depressive episode. F33 codes recurrent major depressive disorder. F34.1 codes persistent depressive disorder, documented in most charts as dysthymia or chronic depression.

Three additional codes cover presentations the three families exclude. F32.A codes depression where major depressive disorder is not established. F53.0 codes postpartum depression. F43.21 codes for adjustment disorder with depressed mood.

Code selection depends on documentation rather than clinical difficulty. A note recording only depression cannot support a major depressive disorder code. A major depressive disorder diagnosis without documented severity produces an unspecified code, and unspecified codes generate medical necessity denials on established patients.

This guide covers every depression code in the FY2027 ICD-10-CM code set, the documentation each code requires, the denial patterns these codes produce and the CPT codes reported alongside them.

Depression ICD-10 Codes: Full Reference Table

The FY2027 ICD-10-CM code set took effect on October 1, 2026. Every code below is current under that set.

What Is the ICD-10 Code for Depression?

The ICD-10 code for depression depends on three documented variables. The first is whether major depressive disorder is established. The second is whether the episode is a first occurrence or a recurrence. The third is the severity of the current episode.

These three variables are sequential. Each one narrows the code range for the next. Severity cannot be applied until the episode type is known, and episode type is irrelevant until major depressive disorder is confirmed.

How Is the Correct Depression Code Selected?

Depression code selection follows a fixed five step sequence. Each step eliminates code ranges that no longer apply.

1. Confirm the diagnosis as documented. Depression, major depressive disorder and persistent depressive disorder are three separate index entries producing three different code ranges.
2. Establish the episode history. A first episode routes to F32. Two or more episodes separated by recovery route to F33.
3. Determine the severity of the current episode. Severity is assigned by symptom count and functional impairment, not clinician impression.
4. Check for psychotic features. Documented delusions, hallucinations or depressive stupor move the code from F32.2 to F32.3, or from F33.2 to F33.3.
5. Check remission status. Partial and full remission carry their own codes and require the symptom free interval to be documented.

Skipping any step produces an unspecified code. F32.A, F32.9 and F33.9 are the three outcomes of an incomplete sequence.

What Is the Difference Between F32.A and F32.9?

F32.A codes depression where major depressive disorder is not established. F32.9 codes major depressive disorder, single episode, where severity is not documented. F32.A describes a missing diagnosis. F32.9 describes a missing detail inside a confirmed diagnosis.

This distinction did not exist before October 1, 2021. The ICD-10-CM index directed unspecified depression to F32.9. Every chart note recording only depression was counted as major depressive disorder, which inflated recorded MDD incidence in national data. F32.A was created to separate the two conditions.

The selection rule is binary. Documented major depressive disorder assigns an F32 or F33 code. Documented depression without a stated MDD diagnosis assigns F32.A. A coder cannot convert a chart recording depression into a major depressive disorder diagnosis. That conversion is a coding error, and in risk adjusted populations where MDD carries hierarchical condition category weight it is a compliance exposure.

Index verification: the ICD-10-CM index entry for Depression leads to F32.A. The entry for Depression, major leads to F32.9. An encoder defaulting unspecified depression to F32.9 is running an outdated index mapping.

What Is the Difference Between F32 and F33?

F32 codes the first lifetime depressive episode. F33 codes two or more episodes separated by a period of recovery. This determination precedes severity assignment because it selects the code family.

Three rules govern the F32 and F33 boundary.

• Severity in F33 reflects the current episode, not the most severe episode in the patient history. A patient with two prior severe episodes presenting mildly is coded F33.0.
• Recurrence is permanent. Once an episode is documented as recurrent, subsequent episodes cannot return to F32.
• Two depressive periods without an intervening recovery constitute one episode. The recovery interval must be documented when a recurrent diagnosis is assigned.

ICD-10 Codes for Depression by Severity

Severity in the depression codes is assigned by symptom count and functional impairment. Three core symptoms and seven additional symptoms form the assessment.

The three core symptoms are persistent low mood, loss of interest or pleasure and fatigue or reduced energy. At least one must be present most of the time for two weeks or longer.

The seven additional symptoms are disturbed sleep, poor concentration or indecisiveness, low self confidence, appetite or weight change, thoughts of death or self harm, psychomotor agitation or slowing, and guilt or self blame. The count of these symptoms sets the severity level.

What Is the ICD-10 Code for Mild Depression?

Mild depression is coded F32.0 as a single episode and F33.0 as a recurrent episode. The criteria are two or three symptoms beyond the core criteria, with work and social activity continued despite difficulty.

Mild is the severity level omitted from documentation most frequently. The presentation appears manageable and the note records the diagnosis without the severity qualifier. The omission assigns F32.9, and repeated use of F32.9 on an established patient produces a denial pattern payers identify.

What Is the ICD-10 Code for Moderate Depression?

Moderate depression is coded F32.1 as a single episode and F33.1 as a recurrent episode. The criteria are four to six additional symptoms with considerable difficulty continuing work, social and domestic activity.

F32.1 and F33.1 carry the majority of outpatient psychotherapy volume. These two codes appear alongside extended session lengths more than any other depression code, which raises payer scrutiny on the supporting documentation.

What Is the ICD-10 Code for Severe Depression?

Severe depression without psychotic features is coded F32.2 as a single episode and F33.2 as a recurrent episode. Severe depression with psychotic features is coded F32.3 and F33.3. The criteria are seven or more additional symptoms, marked distress and substantial loss of functioning.

The psychotic feature distinction requires explicit documentation. Delusions, hallucinations or depressive stupor must be described in the note. The phrase psychotic features recorded without supporting description will not survive review. The distinction changes both the treatment authorization and the risk adjustment weight.

What Is the ICD-10 Code for Depression in Remission?

Depression in remission is coded F32.4 for partial remission and F32.5 for full remission as a single episode. Recurrent remission requires a fifth character and is coded F33.40, F33.41 or F33.42.

F33.4 is not a billable code. F33.4 is a category heading requiring a fifth character. A claim submitted with F33.4 rejects at the clearinghouse before reaching the payer.

Remission is not resolution. A patient in full remission retains the diagnosis. Coding the remission preserves the clinical history for subsequent episodes and maintains the risk adjustment record.

What Is the ICD-10 Code for Chronic Depression?

Chronic depression is coded F34.1, dysthymic disorder. The code covers persistent depressive disorder, dysthymia, depressive neurosis and neurotic depression.

F34.1 is defined by duration rather than severity. The criteria are depressed mood present most of the day, more days than not, for at least two years. Symptom intensity is lower than a major depressive episode and symptom duration is substantially longer. The duration threshold in children and adolescents is one year.

F34.1 can be reported alongside an F32 or F33 code when the provider documents both diagnoses. A major depressive episode occurring on an existing persistent depressive disorder is a recognised clinical presentation. The documentation must support each diagnosis independently.

Three adjacent codes complete the F34 range. F34.81 codes disruptive mood dysregulation disorder. F34.89 codes other specified persistent mood disorders. F34.9 codes persistent mood disorder, unspecified.

What Is the ICD-10 Code for Postpartum Depression?

Postpartum depression is coded F53.0. The code sits in category F53, mental and behavioral disorders associated with the puerperium. Its inclusion terms cover postpartum depression and postnatal depression where neither is further specified.

The Excludes1 note governs the F53.0 and O90.6 relationship. Postpartum dysphoria is coded O90.6 and is excluded from F53. An Excludes1 note means the two conditions cannot be reported together. A chart documenting transient mood disturbance in the days following delivery does not assign F53.0.

O99.345 follows the Chapter 15 sequencing rule. Obstetric codes take sequencing priority when a condition is documented as complicating pregnancy, childbirth or the puerperium. O99.345 is reported with an additional code identifying the specific mental disorder. Major depressive disorder complicating the puerperium is coded O99.345 followed by the applicable F32 or F33 code. Postpartum depression documented without further specification is coded F53.0.

Documentation requirement: onset timing relative to delivery supports every code in this group. A note recording depressive symptoms without placing them in the puerperium assigns an ordinary F32 or F33 code with no obstetric link.

What Is the ICD-10 Code for Depression With Anxiety?

ICD 10-CM contains no combination code for depression with anxiety. The code assignment depends on how the provider documented the two conditions.

Two separately documented diagnoses are reported with two codes. Depression assigns the applicable F32, F33 or F34.1 code. Anxiety assigns F41.1 for generalized anxiety disorder or F41.9 for anxiety unspecified. Sequencing follows the reason for the encounter.

Mixed anxiety and depression documented as a single presentation assigns F41.8, other specified anxiety disorders. F41.8 is the index entry for anxiety depression that is mild or not persistent. F41.8 does not apply where the provider diagnosed major depressive disorder and an anxiety disorder as distinct conditions.

Depressive and anxious symptoms following an identifiable stressor, where neither disorder meets full criteria, assign F43.23, adjustment disorder with mixed anxiety and depressed mood.

Which Conditions Are Not Coded as Depression?

Eight presentations resemble depression in documentation and assign codes outside F32 and F33. Reporting an F32 or F33 code for any of them transfers a diagnostic error into the claim.

What Documentation Is Required for Depression Coding?

Six documentation elements determine whether a depression diagnosis assigns a specific code. A note missing any element assigns an unspecified code.

• Diagnosis as stated. Depression, major depressive disorder and persistent depressive disorder are separate index entries assigning different codes
• Episode history. First episode or two or more prior episodes, with the recovery interval documented for a recurrent diagnosis
• Severity. Mild, moderate or severe, supported by the symptoms present rather than stated as a conclusion
• Psychotic features. Present or absent, and described where present
• Remission status. Partial or full, with the symptom free interval documented
• Comorbid conditions. Anxiety disorders, substance use and medical conditions contributing to the mood disturbance

Severity is the element omitted most frequently. Severity determines whether the claim carries a specific code or an unspecified one, which makes it the highest value documentation improvement available to a practice.

Why Are Depression Claims Denied?

Depression claims deny on five reason codes. Four of the five originate in the diagnosis code rather than the service.

CO-109 and CO-16 contain no clinical component. Behavioral health carve outs and taxonomy mismatches are front end administrative failures and are fully preventable before submission.

Which CPT Codes Are Reported With Depression Diagnoses?

Depression diagnoses are reported with nine CPT code and HCPCS code groups. The diagnosis code establishes medical necessity. The procedure code determines payment.

Two pairings produce the majority of avoidable denials in this group. 96127 reported alongside an office visit requires the screening to be separately identifiable from the evaluation. G0444 reported with a depressive disorder code contradicts the screening benefit, which applies to patients without an established diagnosis.

How Stream RCM Supports Depression Billing

Stream RCM operates behavioral health billing as a separate workflow from general medical billing. Carve out verification runs before claim routing, which sends behavioral health claims to the behavioral health payer rather than the medical plan. Taxonomy validation runs for practices billing both service lines under one tax identification number. Session counts are tracked against the active authorization, which prevents the authorization denials concentrated in ongoing psychotherapy.

Coding review targets the documentation elements that force unspecified codes. Severity, episode history and remission status are verified against the note before submission rather than after a medical necessity denial. An unspecified code accepted at intake and still in use six months later is the most predictable denial handling in behavioral health billing and the most preventable.

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