ICD-9 Diagnosis Code 311

Depressive disorder NEC

Diagnosis Code 311

ICD-9: 311
Short Description: Depressive disorder NEC
Long Description: Depressive disorder, not elsewhere classified
This is the 2014 version of the ICD-9-CM diagnosis code 311

Code Classification
  • Mental disorders
    • Neurotic disorders, personality disorders, and other nonpsychotic mental disorders (300-316)
      • 311 Depressive disorder, not elsewhere classified

Information for Medical Professionals

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The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Chronic depression
  • Complaining of feeling depressed
  • Decline in Edinburgh postnatal depression scale score at 8 months
  • Depression requiring intervention
  • Depression worse in morning
  • Depression worse later in day
  • Depressive disorder
  • Depressive disorder in mother complicating childbirth
  • Depressive disorder in remission
  • Depressive position relationship
  • Depressive preoccupation
  • Feeling empty
  • Feeling lost
  • Feeling of loss of feeling
  • Feeling unloved
  • Feeling unwanted
  • Feels everything is futile
  • Involutional depression
  • Major depression, melancholic type
  • Masked depression
  • Mild depression
  • Minor depressive disorder
  • Moderate depression
  • On examination - depressed
  • Postoperative depression
  • Post-schizophrenic depression
  • Postviral depression
  • Preoccupation with disaster
  • Preoccupation with ruin
  • Severe depression
  • Stuporous depression
  • Symptoms of depression

Index of Diseases and Injuries
References found for the code 311 in the Index of Diseases and Injuries:

Information for Patients


Also called: Clinical depression, Dysthymic disorder, Major depressive disorder, Unipolar depression

Depression is a serious medical illness that involves the brain. It's more than just a feeling of being "down in the dumps" or "blue" for a few days. If you are one of the more than 20 million people in the United States who have depression, the feelings do not go away. They persist and interfere with your everyday life. Symptoms can include

  • Sadness
  • Loss of interest or pleasure in activities you used to enjoy
  • Change in weight
  • Difficulty sleeping or oversleeping
  • Energy loss
  • Feelings of worthlessness
  • Thoughts of death or suicide

Depression is a disorder of the brain. There are a variety of causes, including genetic, environmental, psychological, and biochemical factors. Depression usually starts between the ages of 15 and 30, and is much more common in women. Women can also get postpartum depression after the birth of a baby. Some people get seasonal affective disorder in the winter. Depression is one part of bipolar disorder.

There are effective treatments for depression, including antidepressants and talk therapy. Most people do best by using both.

NIH: National Institute of Mental Health

  • Depression
  • Depression - elderly
  • Depression - stopping your medicines
  • Dysthymia
  • Heart disease and depression
  • Learning about depression
  • Major depression
  • Major depression with psychotic features

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