ICD-10-CM Code G47.21

Circadian rhythm sleep disorder, delayed sleep phase type

Version 2021 Billable Code

Valid for Submission

G47.21 is a billable code used to specify a medical diagnosis of circadian rhythm sleep disorder, delayed sleep phase type. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code G47.21 might also be used to specify conditions or terms like sleep-wake schedule disorder, delayed phase type.

ICD-10:G47.21
Short Description:Circadian rhythm sleep disorder, delayed sleep phase type
Long Description:Circadian rhythm sleep disorder, delayed sleep phase type

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code G47.21:

Inclusion Terms

Inclusion Terms
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.
  • Delayed sleep phase syndrome

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 G47.21 are found in the index:


Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Sleep-wake schedule disorder, delayed phase type

Convert G47.21 to ICD-9

  • 327.31 - Circadian rhy-delay slp

Code Classification

  • Diseases of the nervous system (G00–G99)
    • Episodic and paroxysmal disorders (G40-G47)
      • Sleep disorders (G47)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Sleep Disorders

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
  • Medicines
  • Genetics

Sometimes the cause is not known.

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.
  • Changing your sleep habits (Medical Encyclopedia)
  • Drowsiness (Medical Encyclopedia)
  • Idiopathic hypersomnia (Medical Encyclopedia)
  • Irregular sleep-wake syndrome (Medical Encyclopedia)
  • Isolated sleep paralysis (Medical Encyclopedia)
  • Medicines for sleep (Medical Encyclopedia)
  • Narcolepsy (Medical Encyclopedia)
  • Nightmares (Medical Encyclopedia)
  • Sleep and your health (Medical Encyclopedia)
  • Sleep disorders (Medical Encyclopedia)
  • Teenagers and sleep (Medical Encyclopedia)

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