Specific code 2015 ICD-9-CM Diagnosis Code 311
Depressive disorder, not elsewhere classified
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 311 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 311 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
Convert to ICD-10-CM: 311 converts approximately to:
  • 2015/16 ICD-10-CM F32.9 Major depressive disorder, single episode, unspecified
Approximate Synonyms
  • Chronic depression
  • Complaining of feeling depressed
  • Depressed mood
  • Depression
  • Depression during labor and delivery
  • Depression in childbirth
  • Depression in pregnancy
  • Depression requiring intervention
  • Depression worse in morning
  • Depression worse later in day
  • Depression, unspecified
  • Depressive disorder
  • 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
  • Postpartum depression
  • Postpartum depression (after childbirth)
  • Post-schizophrenic depression
  • Postviral depression
  • Preoccupation with disaster
  • Preoccupation with ruin
  • Severe depression
  • Stuporous depression
  • Symptoms of depression
Clinical Information
  • A mental state of depressed mood characterised by feelings of sadness, despair and discouragement
  • Mild depression that is not considered clinical depression. For clinical depression, use major depression
  • Unpleasant, but not necessarily irrational or pathological, mood state characterized by sadness, despair, or discouragement; "the blues"; may also involve low self-esteem, social withdrawal, and somatic symptoms such as eating and sleep disturbance
311 Excludes
  • acute reaction to major stress with depressive symptoms (308.0)
  • affective personality disorder (301.10-301.13)
  • affective psychoses (296.0-296.9)
  • brief depressive reaction (309.0)
  • depressive states associated with stressful events (309.0-309.1)
  • disturbance of emotions specific to childhood and adolescence, with misery and unhappiness (313.1)
  • mixed adjustment reaction with depressive symptoms (309.4)
  • neurotic depression (300.4)
  • prolonged depressive adjustment reaction (309.1)
  • psychogenic depressive psychosis (298.0)
Applies To
  • Depressive disorder NOS
  • Depressive state NOS
  • Depression NOS
ICD-9-CM Volume 2 Index entries containing back-references to 311:
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 311 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.