Valid for Submission
G47.421 is a billable diagnosis code used to specify a medical diagnosis of narcolepsy in conditions classified elsewhere with cataplexy. The code G47.421 is valid during the fiscal year 2022 from October 01, 2021 through September 30, 2022 for the submission of HIPAA-covered transactions.
The ICD-10-CM code G47.421 might also be used to specify conditions or terms like narcolepsy, secondary narcolepsy or secondary narcolepsy with cataplexy.
Index to Diseases and Injuries
The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code G47.421 are found in the index:
The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10 Code Edits are applicable to this code:
The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:
- Secondary narcolepsy
- Secondary narcolepsy with cataplexy
Convert G47.421 to ICD-9 Code
Information for Patients
What is sleep?
Sleep is a complex biological process. While you are sleeping, you are unconscious, but your brain and body functions are still active. They are doing a number of important jobs that help you stay healthy and function at your best. So when you don't get enough quality sleep, it does more than just make you feel tired. It can affect your physical and mental health, thinking, and daily functioning.
What are sleep disorders?
Sleep disorders are conditions that disturb your normal sleep patterns. There are more than 80 different sleep disorders. Some major types include
- Insomnia - being unable to fall asleep and stay asleep. This is the most common sleep disorder.
- Sleep apnea - a breathing disorder in which you stop breathing for 10 seconds or more during sleep
- Restless leg syndrome (RLS) - a tingling or prickly sensation in your legs, along with a powerful urge to move them
- Hypersomnia - being unable to stay awake during the day. This includes narcolepsy, which causes extreme daytime sleepiness.
- Circadian rhythm disorders - problems with the sleep-wake cycle. They make you unable to sleep and wake at the right times.
- Parasomnia - acting in unusual ways while falling asleep, sleeping, or waking from sleep, such as walking, talking, or eating
Some people who feel tired during the day have a true sleep disorder. But for others, the real problem is not allowing enough time for sleep. It's important to get enough sleep every night. The amount of sleep you need depends on several factors, including your age, lifestyle, health, and whether you have been getting enough sleep recently. Most adults need about 7-8 hours each night.
What causes sleep disorders?
There are different causes for different sleep disorders, including
- Other conditions, such as heart disease, lung disease, nerve disorders, and pain
- Mental illnesses, including depression and anxiety
Sometimes the cause is unknown.
There are also some factors that can contribute to sleep problems, including
- Caffeine and alcohol
- An irregular schedule, such as working the night shift
- Aging. As people age, they often get less sleep or spend less time in the deep, restful stage of sleep. They are also more easily awakened.
What are the symptoms of sleep disorders?
The symptoms of sleep disorders depend on the specific disorder. Some signs that you may have a sleep disorder include that
- You regularly take more than 30 minutes each night to fall asleep
- You regularly wake up several times each night and then have trouble falling back to sleep, or you wake up too early in the morning
- You often feel sleepy during the day, take frequent naps, or fall asleep at the wrong times during the day
- Your bed partner says that when you sleep, you snore loudly, snort, gasp, make choking sounds, or stop breathing for short periods
- You have creeping, tingling, or crawling feelings in your legs or arms that are relieved by moving or massaging them, especially in the evening and when trying to fall asleep
- Your bed partner notices that your legs or arms jerk often during sleep
- You have vivid, dreamlike experiences while falling asleep or dozing
- You have episodes of sudden muscle weakness when you are angry or fearful, or when you laugh
- You feel as though you cannot move when you first wake up
How are sleep disorders diagnosed?
To make a diagnosis, your health care provider will use your medical history, your sleep history, and a physical exam. You may also have a sleep study (polysomnogram). The most common types of sleep studies monitor and record data about your body during a full night of sleep. The data includes
- Brain wave changes
- Eye movements
- Breathing rate
- Blood pressure
- Heart rate and electrical activity of the heart and other muscles
Other types of sleep studies may check how quickly you fall asleep during daytime naps or whether you are able to stay awake and alert during the day.
What are the treatments for sleep disorders?
Treatments for sleep disorders depend on which disorder you have. They may include
- Good sleep habits and other lifestyle changes, such as a healthy diet and exercise
- Cognitive behavioral therapy or relaxation techniques to reduce anxiety about getting enough sleep
- CPAP (continuous positive airway pressure) machine for sleep apnea
- Bright light therapy (in the morning)
- Medicines, including sleeping pills. Usually, providers recommend that you use sleeping pills for a short period of time.
- Natural products, such as melatonin. These products may help some people but are generally for short-term use. Make sure to check with your health care provider before you take any of them.
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Narcolepsy is a chronic sleep disorder that disrupts the normal sleep-wake cycle. Although this condition can appear at any age, it most often begins in adolescence.
Narcolepsy is characterized by excessive daytime sleepiness. Affected individuals feel tired during the day, and several times a day they may experience an overwhelming urge to sleep. "Sleep attacks" can occur at unusual times, such as during a meal or in the middle of a conversation. They last from a few seconds to a few minutes and often lead to a longer nap, after which affected individuals wake up feeling refreshed.
Another common feature of narcolepsy is cataplexy, which is a sudden loss of muscle tone in response to strong emotion (such as laughing, surprise, or anger). These episodes of muscle weakness can cause an affected person to slump over or fall, which occasionally leads to injury. Episodes of cataplexy usually last just a few seconds, and they may occur from several times a day to a few times a year. Most people diagnosed with narcolepsy also have cataplexy. However, some do not, which has led researchers to distinguish two major forms of the condition: narcolepsy with cataplexy and narcolepsy without cataplexy.
Narcolepsy also affects nighttime sleep. Most affected individuals have trouble sleeping for more than a few hours at night. They often experience vivid hallucinations while falling asleep (hypnogogic hallucinations) or while waking up (hypnopompic hallucinations). Affected individuals often have realistic and distressing dreams, and they may act out their dreams by moving excessively or talking in their sleep. Many people with narcolepsy also experience sleep paralysis, which is an inability to move or speak for a short period while falling asleep or awakening. The combination of hallucinations, vivid dreams, and sleep paralysis is often frightening and unpleasant for affected individuals.
Some people with narcolepsy have all of the major features of the disorder, while others have only one or two. Most of the signs and symptoms persist throughout life, although episodes of cataplexy may become less frequent with age and treatment.
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