We all lost an hour of sleep when we “sprang forward” this past weekend. This week is National Sleep Awareness Week for 2026. In its 28th year and instituted by the National Sleep Foundation (NSF), it is their national campaign emphasizing the importance of sleep to health and well-being. It’s also their call to action, letting the public know to prioritize quality sleep. Sleep Awareness Week coincides with Daylight Savings Time, when we are all very aware of the sleep we are missing.
For our coding focus we are going to look at one of the most common sleep issues – insomnia. According to the Mayo Clinic insomnia is common, we have all suffered from the occasional sleepless night. It may cause you to have difficulty falling asleep or staying asleep. It may make you wake up in the night and have difficulty getting back to sleep. We all know how it can make you feel. You wake up tired, with no energy and maybe even in a bad mood. Insomnia affects your physical and mental health impacting your quality of life.
Mayo Clinic notes adults may suffer from short-term insomnia or long-term insomnia. Short-term insomnia is often caused by stress and can last for days or weeks. Long-term or chronic insomnia lasts for three months or longer. This may be related to medications or other medical conditions.
Short-term insomnia would be assigned to F51.02, Adjustment insomnia. Alphabetic index entries for stress-related insomnia and transient insomnia also assign to F51.02. While there is no Alphabetic Index for long-term insomnia, there is an entry for Chronic insomnia and would be assigned to F51.04, Psychophysiologic insomnia.
Mayo Clinic also notes that insomnia becomes more common with age. This could be due to a change in sleep patterns, changes in health and changes to the level of daily activity. Medications can also play a part.
Children and teens can have sleep issues too. Mayo Clinic notes this could be due to the fact that their internal clocks are more delayed. They may want to stay up later at night and sleep later in the morning. Anyone who has or has had teenagers know this to be true. Codes for behavioral insomnia of childhood are found at Z73.81, with specific codes for sleep-onset association type, limit setting type, combined and unspecified types.
G47 is where we would find our sleep disorder codes. G47.0 covers insomnia with insomnia unspecified or NOS at G47.00. Insomnia due to a medical condition would be assigned G47.01. Here we have a code also note instructing us to code also the associated medical condition. Remember that code also note does not give us any sequencing guidance. G47.09 would be assigned for other insomnia. We would assign this when our documentation gives us some specificity but no specific code exists.
F51.0 is where we would find codes for insomnia not due to a substance or known physiological condition. This would include primary insomnia, adjustment, paradoxical, psychophysiologic and insomnia due to other mental disorder. There is also another code option here at F51.09. Insomnia due to a specific substance would be coded to the appropriate dependence, abuse or use code. Insomnia coding shouldn’t keep you up at night when you review your guidelines and documentation.
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