DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

F51 Sleep disorders not due to a substance or known physiological condition

  • Header · not billable

F51 is not billable. The category heads 15 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

  • Somnambulism → F51.3
  • Pseudoinsomnia → F51.03
  • Terror(s) night (child) → F51.4

Where it sits

  1. Chapter 5 Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
  2. F50-F59 Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59)
  3. F51 Sleep disorders not due to a substance or known physiological condition
Billable codes
15
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
60

Codes in F51

  1. F51.0
    Insomnia not due to a substance or known physiological condition
    Header
    Excludes2 6

    Excludes2

  2. F51.01
    Primary insomnia
    Billable
    Inclusion terms 1

    Inclusion terms

    • Idiopathic insomnia
  3. F51.02
    Adjustment insomnia
    Billable
  4. F51.03
    Paradoxical insomnia
    Billable
  5. F51.04
    Psychophysiologic insomnia
    Billable
  6. F51.05
    Insomnia due to other mental disorder
    Billable
    Code also 1

    Code also

    • associated mental disorder
  7. F51.09
    Other insomnia not due to a substance or known physiological condition
    Billable
  8. F51.1
    Hypersomnia not due to a substance or known physiological condition
    Header
    Excludes2 6

    Excludes2

  9. F51.11
    Primary hypersomnia
    Billable
  10. F51.12
    Insufficient sleep syndrome
    Billable
    Excludes1 1

    Excludes1

    • sleep deprivation (Z72.820) Z72.820
  11. F51.13
    Hypersomnia due to other mental disorder
    Billable
    Code also 1

    Code also

    • associated mental disorder
  12. F51.19
    Other hypersomnia not due to a substance or known physiological condition
    Billable
  13. F51.3
    Sleepwalking [somnambulism]
    Billable
    Inclusion terms 1

    Inclusion terms

    • Non-rapid eye movement sleep arousal disorders, sleepwalking type
  14. F51.4
    Sleep terrors [night terrors]
    Billable
    Inclusion terms 1

    Inclusion terms

    • Non-rapid eye movement sleep arousal disorders, sleep terror type
  15. F51.5
    Nightmare disorder
    Billable
    Inclusion terms 1

    Inclusion terms

    • Dream anxiety disorder
  16. F51.8
    Other sleep disorders not due to a substance or known physiological condition
    Billable
  17. F51.9
    Sleep disorder not due to a substance or known physiological condition, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Emotional sleep disorder NOS

Sources of each column.

Instructions

At F51

Excludes2

  • organic sleep disorders (G47.-) G47

Notes that also apply

Chapter 5 instructions (Includes 1, Excludes2 1): printed on the chapter 5 page.

Index entries

  • Misperception, sleep state → F51.02
  • Pseudoinsomnia → F51.03
  • Somnambulism → F51.3
  • Terror(s) night (child) → F51.4
  • Nightmares (REM sleep type) → F51.5
  • Insomnia (organic)idiopathic → F51.01
  • Insomnia (organic)nonorganic origin → F51.01
  • Insomnia (organic)not due to a substance or known physiological condition → F51.01
  • Insomnia (organic)primary → F51.01
  • Insomnia (organic)adjustment → F51.02
  • Insomnia (organic)adjustment disorder → F51.02
  • Insomnia (organic)short-term → F51.02
  • Insomnia (organic)stress-related → F51.02
  • Insomnia (organic)transient → F51.02
  • Insomnia (organic)without objective findings → F51.02
  • Hypochondria, hypochondriac, hypochondriasis (reaction)sleep → F51.03
  • Insomnia (organic)paradoxical → F51.03
  • Insomnia (organic)chronic → F51.04
  • Insomnia (organic)conditioned → F51.04
  • Insomnia (organic)psychophysiologic → F51.04
  • Insomnia (organic)psychiatric → F51.05
  • Insomnia (organic)related to psychopathology → F51.05
  • Hypersomnia (organic)nonorganic origin → F51.11
  • Hypersomnia (organic)not due to a substance or known physiological condition → F51.11
  • Hypersomnia (organic)primary → F51.11
  • Somnolencenonorganic origin → F51.11
  • Insufficiency, insufficientsleep syndrome → F51.12
  • Syndromeinsufficient sleep → F51.12
  • Insomnia (organic)learned → F51.3
  • Sleepwalking → F51.3
  • Walkingsleep → F51.3
  • Nightterrors (child) → F51.4
  • Sleepterrors → F51.4
  • Disorder (of)dream anxiety → F51.5
  • Disorder (of)nightmare → F51.5
  • Parasomnianonorganic origin → F51.8
  • Drunkenness (without dependence)sleep → F51.9
  • Problem (with) (related to)sleep disorder, child → F51.9
  • Sleepdrunkenness → F51.9
  • Insomnia (organic)chronicsomatized tension → F51.04

20 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

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