Implications Of ICD-10 Coding For Tonic Clonic Seizures

What is Tonic Clonic Seizures?

Tonic Clonic seizures, formerly known as grand mal seizures, are a type of seizure that affects the entire brain. They are characterized by a sudden loss of consciousness, muscle stiffness (tonic phase), and jerking movements (clonic phase). These seizures can be frightening for both the person experiencing them and those witnessing them.

Code Information

Common Pathologies of the Brain: Preparing for ICD--CM/PCS - ppt
Common Pathologies of the Brain: Preparing for ICD–CM/PCS – ppt

The ICD-10 code for tonic clonic seizures is G40.0. This code is used to classify and code seizures in medical records for billing and statistical purposes. It is important to use the correct code to ensure accurate documentation and reimbursement.

Diagnostic Related Groups (MS-DRG)

ICD--CM Diagnosis Code G
ICD–CM Diagnosis Code G

When a patient is hospitalized for tonic clonic seizures, the MS-DRG that may be assigned is 101 – Seizures with MCC (Major Complications or Comorbidities) or 102 – Seizures without MCC. These DRGs help classify patients into similar groups for billing and reimbursement purposes.

Convert to ICD-9 Code

The equivalent ICD-9 code for G40.0 is 345.3. This code was used prior to the implementation of ICD-10 and may still be found in older medical records. It is important to be familiar with both code sets when working with patient data.

Code History

The code for tonic clonic seizures has evolved over the years to better classify and differentiate between different types of seizures. The transition from ICD-9 to ICD-10 allowed for more specificity in coding, leading to more accurate documentation and treatment.

Approximate Synonyms

Some approximate synonyms for tonic clonic seizures include generalized tonic clonic seizures, grand mal seizures, and convulsive seizures. These terms are used interchangeably to describe the same type of seizure presentation.

Clinical Information

Tonic clonic seizures can be caused by a variety of factors, including epilepsy, brain injuries, infections, and genetic factors. They can occur at any age and may be triggered by stress, lack of sleep, or other environmental factors. It is important to seek medical attention if you or someone you know experiences tonic clonic seizures.


The exact cause of tonic clonic seizures is not always known. However, some common causes include epilepsy, brain tumors, head injuries, infections, and genetic factors. It is important to work with a healthcare provider to determine the underlying cause of seizures and develop an appropriate treatment plan.


The symptoms of tonic clonic seizures can vary from person to person but often include a sudden loss of consciousness, muscle stiffness, jerking movements, and confusion upon regaining consciousness. It is important to note any specific symptoms experienced during a seizure to help with diagnosis and treatment.


Diagnosing tonic clonic seizures typically involves a thorough medical history, physical exam, and neurological testing. Additional tests such as EEG (electroencephalogram) and imaging studies may be performed to help identify the underlying cause of seizures. It is important to work with a healthcare provider to receive an accurate diagnosis and appropriate treatment.


Treatment for tonic clonic seizures may include antiepileptic medications, lifestyle modifications, and in some cases, surgery. The goal of treatment is to reduce the frequency and severity of seizures while improving quality of life. It is important to work closely with a healthcare provider to develop a personalized treatment plan that meets individual needs.


Tonic clonic seizures are a type of seizure that affects the entire brain, leading to a loss of consciousness, muscle stiffness, and jerking movements. Proper diagnosis and treatment are essential for managing seizures and improving quality of life for individuals affected. By understanding the causes, symptoms, and treatment options for tonic clonic seizures, individuals can work with healthcare providers to develop a personalized care plan.


Q: Are tonic clonic seizures the same as grand mal seizures?
A: Yes, tonic clonic seizures were formerly known as grand mal seizures.

Q: What is the difference between tonic clonic seizures and other types of seizures?
A: Tonic clonic seizures involve both muscle stiffness and jerking movements, while other types of seizures may present differently.

Q: Can tonic clonic seizures be prevented?
A: While some triggers may be avoided, it is not always possible to prevent

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