ICD10 code of Conversion Disorder and ICD9 code

Conversion disorder, now clinically classified as Functional Neurological Disorder (FND), is identified by the ICD-10 code F44.x (specifically F44.4–F44.7) and was previously coded under 300.11 in the ICD-9 system. It is a complex condition where patients experience neurological symptoms that cannot be explained by structural disease, affecting the body's motor or sensory functions.

How is conversion disorder classified in medical coding?

In modern diagnostic practice, Conversion Disorder is increasingly referred to as Functional Neurological Disorder (FND). While the ICD-10 code F44.x remains the standard for billing and medical documentation, clinicians are shifting toward the DSM-5 criteria, which emphasize positive clinical signs (such as Hoover’s sign) rather than just the absence of other diseases. Understanding these codes is essential for patients navigating insurance and disability documentation for Conversion Disorder.

What are the primary symptoms of conversion disorder?

Symptoms of Conversion Disorder often mimic neurological conditions like epilepsy or stroke, despite the absence of organic brain lesions. These manifestations vary significantly among the 21 members of the DiseaseMaps community currently navigating this diagnosis. Common presentations include:

• Motor symptoms: Weakness, paralysis, or abnormal gait.


• Sensory symptoms: Loss of touch, vision, or hearing.


• Non-epileptic seizures: Episodes that resemble seizures but lack the abnormal electrical activity seen in epilepsy.


• Speech disturbances: Aphonia or stuttering that occurs suddenly.

How is conversion disorder diagnosed?

A diagnosis of Conversion Disorder requires a thorough clinical assessment by a neurologist or psychiatrist. The process involves ruling out structural pathologies (like multiple sclerosis or tumors) through MRI or EEG, followed by identifying specific "positive" clinical signs that demonstrate the internal inconsistency of the symptoms. Because Conversion Disorder is a diagnosis of exclusion in some frameworks, it is vital to work with a multidisciplinary team to ensure no underlying organic cause is missed.

Next steps

• Consult a neurologist specializing in functional disorders for a definitive diagnosis.


• Engage with a physical therapist experienced in retraining the brain-body connection.


• Join the Conversion Disorder community on DiseaseMaps.org to share experiences with others.


• Seek a clinical psychologist specializing in cognitive behavioral therapy (CBT) for FND.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• World Health Organization (WHO): ICD-10 Version:2019 (Chapter V: Mental and behavioural disorders).


• NIH Genetic and Rare Diseases Information Center (GARD): Functional Neurological Disorder.


• FND Hope: Information and support for patients living with Functional Neurological Disorder.


• American Psychiatric Association: Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR).