ICD-9 Code 343.3

Congenital monoplegia

Not Valid for Submission

343.3 is a legacy non-billable code used to specify a medical diagnosis of congenital monoplegia. This code was replaced on September 30, 2015 by its ICD-10 equivalent.

ICD-9: 343.3
Short Description:Congenital monoplegia
Long Description:Congenital monoplegia

Convert 343.3 to ICD-10

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

  • G80.8 - Other cerebral palsy

Code Classification

  • Diseases of the nervous system (320–359)
    • Other disorders of the central nervous system (340-349)
      • 343 Infantile cerebral palsy

Information for Medical Professionals

Index to Diseases and Injuries

References found for the code 343.3 in the Index of Diseases and Injuries:


Information for Patients


Cerebral Palsy

What is cerebral palsy (CP)?

Cerebral palsy (CP) is a group of disorders that cause problems with movement, balance, and posture. CP affects the cerebral motor cortex. This is the part of the brain that directs muscle movement. In fact, the first part of the name, cerebral, means having to do with the brain. The second part, palsy, means weakness or problems with using the muscles.

What are the types of cerebral palsy (CP)?

There are different types of CP:

  • Spastic cerebral palsy, which is the most common type. It causes increased muscle tone, stiff muscles, and awkward movements. Sometimes it only affects one part of the body. In other cases, it can affect both arms and legs, the trunk, and the face.
  • Dyskinetic cerebral palsy, which causes problems controlling the movement of the hands, arms, feet, and legs. This can make it hard to sit and walk.
  • Ataxic cerebral palsy, which causes problems with balance and coordination
  • Mixed cerebral palsy, which means that you have symptoms of more than one type

What causes cerebral palsy (CP)?

CP is caused by abnormal development or damage to the developing brain. It could happen when:

  • The cerebral motor cortex doesn't develop normally during fetal growth
  • There is an injury to the brain before, during, or after birth

Both the brain damage and the disabilities it causes are permanent.

Who is at risk for cerebral palsy (CP)?

CP is more common among boys than girls. It affects black children more often than white children.

Certain medical conditions or events that can happen during pregnancy and delivery that may increase a baby's risk of being born with cerebral palsy, including:

  • Being born too small
  • Being born too early
  • Being born a twin or other multiple birth
  • Being conceived by in vitro fertilization (IVF) or other assisted reproductive technology (ART)
  • Having a mother who had an infection during pregnancy
  • Having a mother with certain health problems in pregnancy, such as thyroid problems
  • Severe jaundice
  • Having complications during birth
  • Rh incompatibility
  • Seizures
  • Exposure to toxins

What are the signs of cerebral palsy (CP)?

There are many different types and levels of disability with CP. So the signs can be different in each child.

The signs usually appear in the early months of life. But sometimes there is a delay in getting a diagnosis until after age two. Infants with CP often have developmental delays. They are slow to reach developmental milestones such as learning to roll over, sit, crawl, or walk. They may also have abnormal muscle tone. They may seem floppy, or they may be stiff or rigid.

It's important to know that children without CP can also have these signs. Contact your child's health care provider know if your child has any of these signs, so you can get a correct diagnosis.

How is cerebral palsy (CP) diagnosed?

Diagnosing CP involves several steps:

  • Developmental monitoring (or surveillance) means tracking a child's growth and development over time. If there are any concerns about your child's development, then he or she should have a developmental screening test as soon as possible.
  • Developmental screening involves a giving your child a short test to check for motor, movement, or other developmental delays. If the screenings are not normal, the provider will recommend some evaluations.
  • Developmental and medical evaluations are done to diagnose which disorder your child has. The provider many use many tools to make the diagnosis:
    • A check of your child's motor skills, muscle tone, reflexes, and posture
    • A medical history
    • Lab tests, genetic tests, and/or imaging tests

What are the treatments for cerebral palsy (CP)?

There is no cure for CP, but treatment can improve the lives of those who have it. It is important to begin a treatment program as early as possible.

A team of health professionals will work with you and your child to develop a treatment plan. Common treatments include:

  • Medicines
  • Surgery
  • Assistive devices
  • Physical, occupational, recreational, and speech therapy

Can cerebral palsy (CP) be prevented?

You cannot prevent the genetic problems that can cause CP. But it may be possible to manage or avoid some of the risk factors for CP. For example, making sure that pregnant women have been vaccinated could prevent certain infections that can cause CP in unborn babies. Using cars seats for infants and toddlers could prevent head injuries, which can be a cause of CP.

Centers for Disease Control and Prevention


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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.