Chapter 20

V00–Y99: External Causes of Morbidity

External Causes of Morbidity diagnostic classification updated for 2026.

Internal Codes
  • Y37.521S

    Military operations involving indirect blast effect of nuclear weapon, civilian, sequela

  • Y37.53

    Military operations involving thermal radiation effect of nuclear weapon

  • Y37.530

    Military operations involving thermal radiation effect of nuclear weapon, military personnel

  • Y37.530A

    Military operations involving thermal radiation effect of nuclear weapon, military personnel, initial encounter

  • Y37.530D

    Military operations involving thermal radiation effect of nuclear weapon, military personnel, subsequent encounter

  • Y37.530S

    Military operations involving thermal radiation effect of nuclear weapon, military personnel, sequela

  • Y37.531

    Military operations involving thermal radiation effect of nuclear weapon, civilian

  • Y37.531A

    Military operations involving thermal radiation effect of nuclear weapon, civilian, initial encounter

  • Y37.531D

    Military operations involving thermal radiation effect of nuclear weapon, civilian, subsequent encounter

  • Y37.531S

    Military operations involving thermal radiation effect of nuclear weapon, civilian, sequela

  • Y37.54

    Military operation involving nuclear radiation effects of nuclear weapon

  • Y37.540

    Military operation involving nuclear radiation effects of nuclear weapon, military personnel

  • Y37.540A

    Military operation involving nuclear radiation effects of nuclear weapon, military personnel, initial encounter

  • Y37.540D

    Military operation involving nuclear radiation effects of nuclear weapon, military personnel, subsequent encounter

  • Y37.540S

    Military operation involving nuclear radiation effects of nuclear weapon, military personnel, sequela

  • Y37.541

    Military operation involving nuclear radiation effects of nuclear weapon, civilian

  • Y37.541A

    Military operation involving nuclear radiation effects of nuclear weapon, civilian, initial encounter

  • Y37.541D

    Military operation involving nuclear radiation effects of nuclear weapon, civilian, subsequent encounter

  • Y37.541S

    Military operation involving nuclear radiation effects of nuclear weapon, civilian, sequela

  • Y37.59

    Military operation involving other effects of nuclear weapons

  • Y37.590

    Military operation involving other effects of nuclear weapons, military personnel

  • Y37.590A

    Military operation involving other effects of nuclear weapons, military personnel, initial encounter

  • Y37.590D

    Military operation involving other effects of nuclear weapons, military personnel, subsequent encounter

  • Y37.590S

    Military operation involving other effects of nuclear weapons, military personnel, sequela

  • Y37.591

    Military operation involving other effects of nuclear weapons, civilian

  • Y37.591A

    Military operation involving other effects of nuclear weapons, civilian, initial encounter

  • Y37.591D

    Military operation involving other effects of nuclear weapons, civilian, subsequent encounter

  • Y37.591S

    Military operation involving other effects of nuclear weapons, civilian, sequela

  • Y37.6

    Military operations involving biological weapons

  • Y37.6X

    Military operations involving biological weapons

  • Y37.6X0

    Military operations involving biological weapons, military personnel

  • Y37.6X0A

    Military operations involving biological weapons, military personnel, initial encounter

  • Y37.6X0D

    Military operations involving biological weapons, military personnel, subsequent encounter

  • Y37.6X0S

    Military operations involving biological weapons, military personnel, sequela

  • Y37.6X1

    Military operations involving biological weapons, civilian

  • Y37.6X1A

    Military operations involving biological weapons, civilian, initial encounter

  • Y37.6X1D

    Military operations involving biological weapons, civilian, subsequent encounter

  • Y37.6X1S

    Military operations involving biological weapons, civilian, sequela

  • Y37.7

    Military operations involving chemical weapons and other forms of unconventional warfare

  • Y37.7X

    Military operations involving chemical weapons and other forms of unconventional warfare

  • Y37.7X0

    Military operations involving chemical weapons and other forms of unconventional warfare, military personnel

  • Y37.7X0A

    Military operations involving chemical weapons and other forms of unconventional warfare, military personnel, initial encounter

  • Y37.7X0D

    Military operations involving chemical weapons and other forms of unconventional warfare, military personnel, subsequent encounter

  • Y37.7X0S

    Military operations involving chemical weapons and other forms of unconventional warfare, military personnel, sequela

  • Y37.7X1

    Military operations involving chemical weapons and other forms of unconventional warfare, civilian

  • Y37.7X1A

    Military operations involving chemical weapons and other forms of unconventional warfare, civilian, initial encounter

  • Y37.7X1D

    Military operations involving chemical weapons and other forms of unconventional warfare, civilian, subsequent encounter

  • Y37.7X1S

    Military operations involving chemical weapons and other forms of unconventional warfare, civilian, sequela

  • Y37.9

    Other and unspecified military operations

  • Y37.90

    Military operations, unspecified

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