Major Depressive Disorder (MDD) is one of the psychiatric illnesses which needs careful documentation and coding accuracy. Errors made while coding major depressive disorder, wrongly choosing ICD-10 codes for major depressive disorder, may lead to claim rejection, audit hazard or less than full claim payment. For coders and billers in 2026, a knowledge of the various ICD-10-CM codes of Major Depressive Disorder by the episode, severity, and recurrence is the prerequisite for coders.

This article explains everything there is to know about ICD-10 Major Depressive Disorder codes including single episode, recurrent, mild, moderate and severe symptoms as well as the FAQs.

What Is the ICD-10 Code for Major Depressive Disorder?

Let's start with the most basic question providers, coders, and billers ask every day: What is the ICD-10-CM code for Major Depressive Disorder?

Within ICD-10-CM there are two subdivisions for Major Depressive Disorder (MDD):

F32 - Major Depressive Disorder, single episode: 

Used for reporting a single episode of major depressive disorder, without any previous history.

F33 - Major Depressive Disorder, recurrent: Used while reporting a recurrence of a Major Depressive Disorder or if there is a history of MDD documented by the provider, then recurrence is documented. Recurrence indicates the return of the symptoms of a depression episode after resolution or remission.

There are other code modifiers that can be used for both these types that define severity, extent of remission and presence or absence of psychotic features.

Both these categories are also divided into severity types. The appropriate ICD-10 code for MDD will depend on the specific details about the MDD which is documented by the treating physician in the clinic note.

The most critical component that you will need to determine the accurate ICD-10 code for major depressive disorder is the severity specifier. It is critical to code at the most specific code possible to achieve coverage and avoid denial, as well as, support the medical necessity.

Complete ICD-10-CM Code List for Major Depressive Disorder (2026)

Below is the current, valid ICD-10-CM code set for MDD as of the 2026 code year. These codes are the building blocks every coder must know when working with MDD claims.

ICD-10 Code for Major Depressive Disorder, Recurrent Mild (F33.0)

Major Depressive Disorder, recurrent mild should be assigned to the ICD-10 code F33.0. This code is usually given when the physician documents recurrent mild Major Depressive Disorder. In the patient's case, despite their distress, they maintain social functions and everyday activities.

The documentation provides the following clues for F33.0:

  • Patient notes sustained low mood and/or anhedonia ongoing for more than two weeks
  • Changes in sleep and appetite, but are manageable
  • Function is maintained and the patient is continuing to engage in work/school responsibilities
  • Providers commonly document mild depressive symptoms with minimal functional impairment.
  • Clinician notes symptomatically described as "mild" and "not clinically impairing".

ICD-10 Code for Major Depressive Disorder, Recurrent Moderate (F33.1)

The ICD-10 code for major depressive disorder, recurrent moderate is F33.1. This is perhaps the most frequently billed code in mental health outpatient practices. Moderate MDD is between mild and severe MDD. The patient's impairment is significant and impactful to their daily life, but not so severe that they are completely nonfunctional.

The following documentation notes would support billing this code:

  • Providers commonly document moderate depressive symptoms associated with noticeable functional impairment.
  • Documentation of fatigue, trouble concentrating and disturbed sleep are present.
  • The patient states that work is being affected and that his social interactions and family life are being affected, but that he has not quite lost the ability to function fully.
  • Language such as "moderate depression," "noticeable impairment," or "significant distress" is used by the clinician.
  • Psychotic features are absent.

Severe MDD: F33.2 vs F33.3 - With or Without Psychosis

Severe MDD requires careful disambiguation. The ICD-10 code for major depressive disorder in severe presentations splits into two codes:

F33.2 Major Depressive Disorder, recurrent, severe without psychotic features

This code is used to document a severe recurrent depressive episode which causes considerable impairment in the patient's functioning, but there are no documented psychotic features (no hallucinations or delusions present).

F33.3 Major Depressive Disorder, recurrent, severe with psychotic features

This code is assigned when the physician's documentation reflects a severe recurrent depressive episode with psychotic features such as hallucinations or delusions. Psychotic features should be clearly documented to assign F33.3.

There may be very large differences in the treatment, clinical risk and reimbursement; therefore physician's should make every effort to accurately and specifically detail psychotic features that would necessitate the assignment of the correct ICD-10-CM code for the illness being treated.

Single Episode vs. Recurrent: Getting It Right

One of the most frequent coding mistakes that occurs with the ICD-10 major depressive disorder codes involves differentiating F32 from F33 diagnoses. Here are how to code these conditions.

Use F32 (single episode) when:

  • It is the patient's documented first-ever MDD episode
  • There is no prior psychiatric history of MDD in the medical record
  • The provider explicitly documents "first episode" or "no prior depressive episodes"

Use F33 (recurrent) when:

  • The patient has a prior history of MDD in the chart
  • There is documentation of prior major depressive episodes followed by remission and recurrence.

The provider uses language like "recurrent depression," "relapse," or "history of MDD with new episode"

Documentation Requirements for Accurate MDD Coding

The clinical documentation must support assignment of the highest level of ICD-10-CM specificity for Major Depressive Disorder. Accurate documentation remains important for supporting code selection, medical necessity, and audit readiness. What should coders look for in the clinical note:

  • Episode clearly identified - documentation needs to differentiate between first-ever episode vs recurrent episode.
  • Severity should be documented by the treating provider whenever possible.
  • Psychotic features documented - If present, 'hallucinations' or 'delusions' need to be stated to justify F32.3 or F33.3.
  • Status of remission - If assigning F32.4, F32.5, F33.41 or F33.42, the remission status should be clinically documented by the provider.
  • Comorbidities coded - Assign additional diagnosis codes for any noted comorbidities, such as anxiety, substance use, etc per ICD-10-CM guidelines.

Common Coding Errors and How to Avoid Them

The most common coding errors for Major Depressive Disorder (MDD) seem to arise from an incomplete review of the clinical documentation, or lack of coding to the highest supported specificity. Even experienced professionals can fall into these coding mistakes when assigning ICD-10-CM codes for Major Depressive Disorder (MDD).

  • Using unspecified depression codes when the severity is documented. Assign the correct code for whether provider is marking patient as depressed (minor, moderate, or major depression), and do not assign unspecified codes such as F32.9 Major depressive disorder, single episode, unspecified or F33.9 Major depressive disorder, recurrent, unspecified. The coder must first use the plan and assessment for to determine if depression is being marked before assigning unspecified codes.
  • Using the incorrect code for a patient's episodes of Major Depressive Disorder. There are two different codes to use when reporting Major Depressive Disorder: F32 which is single episode, and F33 which is recurrent episode. When the chart or the provider's notes indicate that the patient has a history of a single major depressive episode, is currently experiencing a current or second, third, etc., Major Depressive episode or has experienced one or more Major Depressive episodes followed by remission and then recurrence, the appropriate code from category F33 should be used.
  • Assigning codes that identify the patient as experiencing Psychotic features when the provider has not documented any psychotic features. Codes like F32.3 or F33.3 identifying a patient with psychotic features, should not be assigned unless the provider has clearly indicated within the clinical notes that the patient has psychotic features associated with the depression such as delusions or hallucinations.
  • Assigning remission codes to patients when the provider has not documented that the depression has been resolved, or placed in partial or complete remission. The coder should not assign remission codes solely because the patient is reporting a decrease in symptoms, is medication managed, or has scored low on the screening tools for depression.
  • Failing to code comorbidities. Major Depressive Disorder is often present with other psychiatric conditions such as PTSD, anxiety disorders, substance use disorders and other comorbidities. The coder should include and report on other comorbidities present along with the Major Depressive Disorder if it is documented in the record, addressed during the visit, and plan in place to treat the disorder according to ICD-10-CM rules and payer policies.

How RapidClaims Supports Accurate MDD Coding in 2026

While the ICD-10 code for major depressive disorder might seem simple on the surface, as illustrated throughout this guide, correctly applying this code requires careful review of provider documentation, the ICD-10-CM coding guidelines and the payer's policies. RapidClaims’ AI coding platform was designed to ease these complexities: 

  • Detect whether to code F32 or F33 based on the episode history wording
  • Identify documented severity specifiers (mild, moderate, or severe) within the provider's assessment and supporting clinical documentation.
  • Alert coders when documentation indicates psychosis, yet a non-psychotic code was chosen
  • Pull all pertinent codes for comorbid diagnoses to prevent undercoding
  • Provide coders with an audit-ready rationale to back each selected code

If you are a sole psychiatrist's practice, a behavioral health practice or a hospital's coding staff, RapidClaims offers the tool to get the correct MDD ICD-10 code on the first claim submission, avoiding claim denials and saving revenue, while keeping patient information correct.

Final Thoughts

When coding Major Depressive Disorder in the ICD-10-CM system, you need to determine the type of episode, severity, presence of psychotic features and current remission. Using the more specific code that is supported by provider documentation will ensure accuracy of the claim, decrease claim denials, and decrease compliance issues. 

Understanding the differences between F32 (single episode) and F33 (recurrent) category and the consistent use of the ICD-10-CM guidelines will ensure the proper coding of MDD with adequate reimbursement and clean claims and audit-proof documentation.

FAQs

  1. What is the ICD-10 code for Major Depressive Disorder (MDD)?

The ICD-10-CM code for Major Depressive Disorder will vary based on whether the episode is single (F32 category) or recurrent (F33 category) and based on severity, remission and psychotic features as documented in the medical record. For example, recurrent, mild MDD is F33.0 and recurrent, moderate MDD is F33.1.

  1. What is the ICD-10 code for Major Depressive Disorder, recurrent, mild?

The ICD-10-CM code for Major Depressive Disorder, recurrent, mild is F33.0. This code is used when the physician notes that the recurrent depression is mild, and has minimal impact on functioning.

  1. What is the ICD-10 code for Major Depressive Disorder, recurrent, moderate?

The ICD-10-CM code for Major Depressive Disorder, recurrent, moderate is F33.1. This code is used when the physician notes that the recurrent depression is moderate and causes noticeable functional impairment.

  1. How do I decide between F33.0 and F33.1?

Use F33.0 when the physician's documentation indicates that the recurrent depression is mild and does not significantly impair the patient's daily life activities. Use F33.1 when the physician documents the recurrent depression as moderate and impacting functionality more substantially. This decision will be based upon the provider's noted severity.

  1. Can I code an unspecified MDD code when the severity is documented?

No. If the provider documents the severity of Major Depressive Disorder, coders should use the most specific ICD-10-CM code available instead of unspecified codes such as F32.9 or F33.9. It's important to code to the greatest level of specificity available in order to be compliant.