ICD-9 Code 300.3

Obsessive-compulsive disorders

Not Valid for Submission

300.3 is a legacy non-billable code used to specify a medical diagnosis of obsessive-compulsive disorders. This code was replaced on September 30, 2015 by its ICD-10 equivalent.

ICD-9: 300.3
Short Description:Obsessive-compulsive dis
Long Description:Obsessive-compulsive disorders

Convert 300.3 to ICD-10

The following crosswalk between ICD-9 to ICD-10 is based based on the General Equivalence Mappings (GEMS) information:

  • F42 - Obsessive-compulsive disorder

Code Classification

  • Mental disorders (290–319)
    • Neurotic disorders, personality disorders, and other nonpsychotic mental disorders (300-316)
      • 300 Neurotic disorders

Information for Medical Professionals

Index to Diseases and Injuries

References found for the code 300.3 in the Index of Diseases and Injuries:


Information for Patients


Obsessive-Compulsive Disorder

What is obsessive-compulsive disorder (OCD)?

Obsessive-compulsive disorder (OCD) is a mental disorder in which you have thoughts (obsessions) and rituals (compulsions) over and over. They interfere with your life, but you cannot control or stop them.

What causes obsessive-compulsive disorder (OCD)?

The cause of obsessive-compulsive disorder (OCD) is unknown. Factors such as genetics, brain biology and chemistry, and your environment may play a role.

Who is at risk for obsessive-compulsive disorder (OCD)?

Obsessive-compulsive disorder (OCD) usually begins when you are a teen or young adult. Boys often develop OCD at a younger age than girls.

Risk factors for OCD include:

  • Family history. People with a first-degree relative (such as a parent, sibling, or child) who has OCD are at higher risk. This is especially true if the relative developed OCD as a child or teen.
  • Brain structure and functioning. Imaging studies have shown that people with OCD have differences in certain parts of the brain. Researchers need to do more studies to understand the connection between the brain differences and OCD.

  • Childhood trauma, such as child abuse. Some studies have found a link between trauma in childhood and OCD. More research is needed to understand this relationship better.

In some cases, children may develop OCD or OCD symptoms following a streptococcal infection. This is called Pediatric Autoimmune Neuropsychiatric Disorders Associated with Streptococcal Infections (PANDAS).

What are the symptoms of obsessive-compulsive disorder (OCD)?

People with OCD may have symptoms of obsessions, compulsions, or both:

  • Obsessions are repeated thoughts, urges, or mental images that cause anxiety. They may involve things such as
    • Fear of germs or contamination
    • Fear of losing or misplacing something
    • Worries about harm coming towards yourself or others
    • Unwanted forbidden thoughts involving sex or religion
    • Aggressive thoughts towards yourself or others
    • Needing things lined up exactly or arranged in a particular, precise way
  • Compulsions are behaviors that you feel like you need to do over and over to try to reduce your anxiety or stop the obsessive thoughts. Some common compulsions include
    • Excessive cleaning and/or handwashing
    • Repeatedly checking on things, such as whether the door is locked or the oven is off
    • Compulsive counting
    • Ordering and arranging things in a particular, precise way

Some people with OCD also have a Tourette syndrome or another tic disorder. Tics are sudden twitches, movements, or sounds that people do repeatedly. People who have tics cannot stop their body from doing these things.

How is obsessive-compulsive disorder (OCD) diagnosed?

The first step is to talk with your health care provider about your symptoms. Your provider should do an exam and ask you about your medical history. He or she needs to make sure that a physical problem is not causing your symptoms. If it seems to be a mental problem, your provider may refer you to a mental health specialist for further evaluation or treatment.

Obsessive-compulsive disorder (OCD) can sometimes be hard to diagnose. Its symptoms are like those of other mental disorders, such as anxiety disorders. It is also possible to have both OCD and another mental disorder.

Not everyone who has obsessions or compulsions has OCD. Your symptoms would usually be considered OCD when you:

  • Can't control your thoughts or behaviors, even when you know that they are excessive
  • Spend at least 1 hour a day on these thoughts or behaviors
  • Don't get pleasure when performing the behaviors. But doing them may briefly give you relief from the anxiety that your thoughts cause.
  • Have significant problems in your daily life because of these thoughts or behaviors

What are the treatments for obsessive-compulsive disorder (OCD)?

The main treatments for obsessive-compulsive disorder (OCD) are cognitive behavioral therapy, medicines, or both:

  • Cognitive behavioral therapy (CBT) is a type of psychotherapy. It teaches you different ways of thinking, behaving, and reacting to the obsessions and compulsions. One specific type of CBT that can treat OCD is called Exposure and Response Prevention (EX/RP). EX/RP involves gradually exposing you to your fears or obsessions. You learn healthy ways to deal with the anxiety they cause.
  • Medicines for OCD include certain types of antidepressants. If those don't work for you, your provider may suggest taking some other type of psychiatric medicine.

NIH: National Institute of Mental Health


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ICD-9 Footnotes

General Equivalence Map Definitions
The ICD-9 and ICD-10 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.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Index of Diseases and Injuries Definitions

  • And - The word "and" should be interpreted to mean either "and" or "or" when it appears in a title.
  • Code also note - A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
  • Code first - Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
  • Type 1 Excludes Notes - A type 1 Excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • Type 2 Excludes Notes - A type 2 Excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
  • Includes Notes - This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
  • Inclusion terms - List of terms is included under some codes. These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • NEC "Not elsewhere classifiable" - This abbreviation in the Alphabetic Index represents "other specified". When a specific code is not available for a condition, the Alphabetic Index directs the coder to the "other specified” code in the Tabular List.
  • NOS "Not otherwise specified" - This abbreviation is the equivalent of unspecified.
  • See - The "see" instruction following a main term in the Alphabetic Index indicates that another term should be referenced. It is necessary to go to the main term referenced with the "see" note to locate the correct code.
  • See Also - A "see also" instruction following a main term in the Alphabetic Index instructs that there is another main term that may also be referenced that may provide additional Alphabetic Index entries that may be useful. It is not necessary to follow the "see also" note when the original main term provides the necessary code.
  • 7th Characters - Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
  • With - The word "with" should be interpreted to mean "associated with" or "due to" when it appears in a code title, the Alphabetic Index, or an instructional note in the Tabular List. The word "with" in the Alphabetic Index is sequenced immediately following the main term, not in alphabetical order.