Learn ICD 10 Code for Depression and ICD-9 to ICD-10 conversion, mapping or crosswalk of mental health codes.

You can also learn ICD-10 Codes for Depression and ICD-9 Codes for Depression w/o Anxiety, Insomnia, Fatigue etc.

ICD stands for International Classification of Diseases. ICD is made by WHO (World Health Organization) and has been used by many parties all over the world. ICD is very useful for the diagnostic tool as it does not only group similar diseases into one major category but also sorts and features the symptoms, complaints, external causes, social conditions, signs, and abnormalities of each disease. ICD is always revised by WHO to keep the codes always up to date though the change of the already existed codes in each revision is kept to be not too much so that people who use it would not take a lot of time to adapt to and implement the new ICD codes.

The current ICD featured by WHO is ICD 10, that was created in 1983, revised in 1990 during 43rd World Health Assembly, and started to be used in 1994. Nevertheless, ICD 9 CM (International Classification of Disease, Ninth Revision, Clinical Modification) is still used in US as the implementation of ICD 10 CM is delayed until October 2015.

Depression ICD 9 and ICD 10 Codes conversion, mapping or crosswalk

ICD 9 CM, made by US National Center for Health Statistics (NCHS), is the modification of WHO’s ICD 9, which was created by WHO in 1975. ICD 9 CM is basically the same as ICD 9. The main difference between ICD 9 and ICD 9 CM is that ICD 9 CM contains detailed morbidity. ICD can be used for morbidity and mortality statistics, assisting diagnostics, information about medical procedures, reimbursement for inpatient, outpatient, and physician office, and supporting health care decision.


Because of the system of ICD codes, it is possible to compare health statistics, including morbidity and mortality statistics, among countries in all over the world. ICD codes contain around 155 thousand different codes, including Depression ICD 9 and ICD 10 Codes. However, there is a stark difference between ICD 9 and ICD 10. ICD 9 codes are only numbers while ICD 10 codes use a letter followed by numbers.

There are different kinds of depression related to different kind of diseases that's why there are different codes for Depression ICD 9 and ICD 10 Codes. In ICD 9 Codes, Depression is coded under Mental Disorders (Code 290 - 319). There following categories in Mental Disorders:
  • Organic Psychotic Conditions
  • Other Psychoses
  • Neurotic Disorders
  • Personality Disorders
  • Intellectual Disabilities
  • Other Non-psychotic Mental Disorders
Depression can be found in 2 categories "Other Psychoses (Code 295 - 299)" and "Neurotic Disorders, Personality Disorders, and Other Non-psychotic Mental Disorders (Code 300 - 316)".

For Depression NOS (Not Otherwise Specified), Depressive State NOS, or Depressive Disorder NOS, the ICD 9 Code used is under the "Neurotic Disorders, Personality Disorders, and Other Nonpsychotic Mental Disorders (Code 300 - 316)" Category, specifically ICD 9 Code 311.

Depression ICD 9 to ICD 10 Codes Conversion

ICD 9 Code 311 is similar to ICD 10 F32.9. This type of depression has many symptoms that so many people are familiar with at some points of their lives. The symptoms may include feeling lost, empty, unloved, unwanted, loss of feeling, masked depression, postpartum (after childbirth) depression, feeling that everything is futile, feeling depressed in the morning or in the day, feeling depressed, etc.
Another type of Depression ICD 9 and ICD 10 Codes is Major Depressive Disorder. For Major Depressive Disorder, it is coded in ICD 9 Codes under "Other Psychoses (Code 295 - 299)", specifically under Code 296 Episodic Mood Disorders. The details of Major Depressive Disorder under Code 296 Episodic Mood disorders can be seen below

296.2 Major Depressive Disorder Single Episode Conversion

Find below the ICD 10 conversion for the ICD 9 code 296.2 Major Depressive Disorder Single Episode:
  • ICD 9 Code 296.20 Major Depressive Affective Disorder, single episode, unspecified. This is similar to ICD 10 Code F32.9.

  • ICD 9 Code 296.21 Major Depressive Affective Disorder, single episode, mild. This is similar to ICD 10 Code F32.0.

  • ICD 9 Code 296.22 Major Depressive Affective Disorder, single episode, moderate. This is similar to ICD 10 Code F32.1.

  • ICD 9 Code 296.23 Major Depressive Affective Disorder, single episode, severe, without psychotic behavior. This is similar to ICD 10 Code F32.2.

  • ICD 9 Code 296.24 Major Depressive Affective Disorder, single episode, severe, with psychotic behavior. This is similar to ICD 10 Code F32.3.

  • ICD 9 Code 296.25 Major Depressive Affective Disorder, single episode, in partial or unspecified remission. This is similar to ICD 10 Code F32.4.

  • ICD 9 Code 296.26 Major Depressive Affective Disorder, single episode, in full remission. This is similar to ICD 10 Code F32.5.

296.3 Major Depressive Disorder Recurrent Episode Conversion

Find below the ICD 10 conversion for the ICD 9 code 296.3 Major Depressive Disorder Recurrent Episode:
  • ICD 9 Code 296.30 Major Depressive Affective Disorder, recurrent episode, unspecified. This is similar to ICD 10 Code F33.9

  • ICD 9 Code 296.31 Major Depressive Affective Disorder, recurrent episode, mild This is similar to ICD 10 Code F33.0

  • ICD 9 Code 296.32 Major Depressive Affective Disorder, recurrent episode, moderate. This is similar to ICD 10 Code F33.1

  • ICD 9 Code 296.33 Major Depressive Affective Disorder, recurrent episode, severe, without psychotic behavior. This is similar to ICD 10 Code F33.2

  • ICD 9 Code 296.34 Major Depressive Affective Disorder, recurrent episode, severe, with psychotic behavior. This is similar to ICD 10 Code F33.3

  • ICD 9 Code 296.35 Major Depressive Affective Disorder, recurrent episode, in partial or unspecified remission. This is similar to ICD 10 Code F33.40 for the unspecified remission and F33.41 for the partial remission.

  • ICD 9 Code 296.36 Major Depressive Affective Disorder, recurrent episode, in full remission. This is similar to ICD 10 Code F33.42
There are not a lot of differences for Depression ICD 9 and ICD 10 Codes. In general, ICD 9 Code 296.2 for Major Depressive Disorder single episode is similar to ICD 10 Code F32, and ICD 9 Code 296.3 for Major Depressive Disorder recurrent episode is similar to ICD 10 Code F33. Other types of Depression are related to other diseases such as bipolar disorder, menopause symptoms or syndrome, psychosis, manic disorder, physical deformities, etc. Review Depression ICD 9 Codes and ICD 10 Codes for more detailed diagnostic information of depression.

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