DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

Y37 Military operations

  • Header · not billable
  • Codes take a 7th character

Y37 is not billable. The category heads 273 billable codes in FY2027, grouped under 10 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Where it sits

  1. Chapter 20 External causes of morbidity (V00-Y99)
  2. Y35-Y38 Legal intervention, operations of war, military operations, and terrorism (Y35-Y38)
  3. Y37 Military operations
Billable codes
273
Subdivisions
10
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in Y37

  1. Y37.0
    Military operations involving explosion of marine weapons
    Header
  2. Y37.00
    Military operations involving explosion of unspecified marine weapon
    Header
    Inclusion terms 1

    Inclusion terms

    • Military operations involving underwater blast NOS
  3. Y37.000
    Military operations involving explosion of unspecified marine weapon, military personnel +7th: A D S
    Needs 7th characterExempt
  4. Y37.001
    Military operations involving explosion of unspecified marine weapon, civilian +7th: A D S
    Needs 7th characterExempt
  5. Y37.01
    Military operations involving explosion of depth-charge
    Header
  6. Y37.010
    Military operations involving explosion of depth-charge, military personnel +7th: A D S
    Needs 7th characterExempt
  7. Y37.011
    Military operations involving explosion of depth-charge, civilian +7th: A D S
    Needs 7th characterExempt
  8. Y37.02
    Military operations involving explosion of marine mine
    Header
    Inclusion terms 1

    Inclusion terms

    • Military operations involving explosion of marine mine, at sea or in harbor
  9. Y37.020
    Military operations involving explosion of marine mine, military personnel +7th: A D S
    Needs 7th characterExempt
  10. Y37.021
    Military operations involving explosion of marine mine, civilian +7th: A D S
    Needs 7th characterExempt
  11. Y37.03
    Military operations involving explosion of sea-based artillery shell
    Header
  12. Y37.030
    Military operations involving explosion of sea-based artillery shell, military personnel +7th: A D S
    Needs 7th characterExempt
  13. Y37.031
    Military operations involving explosion of sea-based artillery shell, civilian +7th: A D S
    Needs 7th characterExempt
  14. Y37.04
    Military operations involving explosion of torpedo
    Header
  15. Y37.040
    Military operations involving explosion of torpedo, military personnel +7th: A D S
    Needs 7th characterExempt
  16. Y37.041
    Military operations involving explosion of torpedo, civilian +7th: A D S
    Needs 7th characterExempt
  17. Y37.05
    Military operations involving accidental detonation of onboard marine weapons
    Header
  18. Y37.050
    Military operations involving accidental detonation of onboard marine weapons, military personnel +7th: A D S
    Needs 7th characterExempt
  19. Y37.051
    Military operations involving accidental detonation of onboard marine weapons, civilian +7th: A D S
    Needs 7th characterExempt
  20. Y37.09
    Military operations involving explosion of other marine weapons
    Header
  21. Y37.090
    Military operations involving explosion of other marine weapons, military personnel +7th: A D S
    Needs 7th characterExempt
  22. Y37.091
    Military operations involving explosion of other marine weapons, civilian +7th: A D S
    Needs 7th characterExempt
  23. Y37.1
    Military operations involving destruction of aircraft
    Header
  24. Y37.10
    Military operations involving unspecified destruction of aircraft
    Header
  25. Y37.100
    Military operations involving unspecified destruction of aircraft, military personnel +7th: A D S
    Needs 7th characterExempt
  26. Y37.101
    Military operations involving unspecified destruction of aircraft, civilian +7th: A D S
    Needs 7th characterExempt
  27. Y37.11
    Military operations involving destruction of aircraft due to enemy fire or explosives
    Header
    Inclusion terms 5

    Inclusion terms

    • Military operations involving destruction of aircraft due to air to air missile
    • Military operations involving destruction of aircraft due to explosive placed on aircraft
    • Military operations involving destruction of aircraft due to rocket propelled grenade [RPG]
    • Military operations involving destruction of aircraft due to small arms fire
    • Military operations involving destruction of aircraft due to surface to air missile
  28. Y37.110
    Military operations involving destruction of aircraft due to enemy fire or explosives, military personnel +7th: A D S
    Needs 7th characterExempt
  29. Y37.111
    Military operations involving destruction of aircraft due to enemy fire or explosives, civilian +7th: A D S
    Needs 7th characterExempt
  30. Y37.12
    Military operations involving destruction of aircraft due to collision with other aircraft
    Header
  31. Y37.120
    Military operations involving destruction of aircraft due to collision with other aircraft, military personnel +7th: A D S
    Needs 7th characterExempt
  32. Y37.121
    Military operations involving destruction of aircraft due to collision with other aircraft, civilian +7th: A D S
    Needs 7th characterExempt
  33. Y37.13
    Military operations involving destruction of aircraft due to onboard fire
    Header
  34. Y37.130
    Military operations involving destruction of aircraft due to onboard fire, military personnel +7th: A D S
    Needs 7th characterExempt
  35. Y37.131
    Military operations involving destruction of aircraft due to onboard fire, civilian +7th: A D S
    Needs 7th characterExempt
  36. Y37.14
    Military operations involving destruction of aircraft due to accidental detonation of onboard munitions and explosives
    Header
  37. Y37.140
    Military operations involving destruction of aircraft due to accidental detonation of onboard munitions and explosives, military personnel +7th: A D S
    Needs 7th characterExempt
  38. Y37.141
    Military operations involving destruction of aircraft due to accidental detonation of onboard munitions and explosives, civilian +7th: A D S
    Needs 7th characterExempt
  39. Y37.19
    Military operations involving other destruction of aircraft
    Header
  40. Y37.190
    Military operations involving other destruction of aircraft, military personnel +7th: A D S
    Needs 7th characterExempt
  41. Y37.191
    Military operations involving other destruction of aircraft, civilian +7th: A D S
    Needs 7th characterExempt
  42. Y37.2
    Military operations involving other explosions and fragments
    Header
    Excludes1 3

    Excludes1

    • military operations involving explosion of aircraft (Y37.1-) Y37.1
    • military operations involving explosion of marine weapons (Y37.0-) Y37.0
    • military operations involving explosion of nuclear weapons (Y37.5-) Y37.5
  43. Y37.20
    Military operations involving unspecified explosion and fragments
    Header
    Inclusion terms 7

    Inclusion terms

    • Military operations involving air blast NOS
    • Military operations involving blast NOS
    • Military operations involving blast fragments NOS
    • Military operations involving blast wave NOS
    • Military operations involving blast wind NOS
    • Military operations involving explosion NOS
    • Military operations involving explosion of bomb NOS
  44. Y37.200
    Military operations involving unspecified explosion and fragments, military personnel +7th: A D S
    Needs 7th characterExempt
  45. Y37.201
    Military operations involving unspecified explosion and fragments, civilian +7th: A D S
    Needs 7th characterExempt
  46. Y37.21
    Military operations involving explosion of aerial bomb
    Header
  47. Y37.210
    Military operations involving explosion of aerial bomb, military personnel +7th: A D S
    Needs 7th characterExempt
  48. Y37.211
    Military operations involving explosion of aerial bomb, civilian +7th: A D S
    Needs 7th characterExempt
  49. Y37.22
    Military operations involving explosion of guided missile
    Header
  50. Y37.220
    Military operations involving explosion of guided missile, military personnel +7th: A D S
    Needs 7th characterExempt
  51. Y37.221
    Military operations involving explosion of guided missile, civilian +7th: A D S
    Needs 7th characterExempt
  52. Y37.23
    Military operations involving explosion of improvised explosive device [IED]
    Header
    Inclusion terms 3

    Inclusion terms

    • Military operations involving explosion of person-borne improvised explosive device [IED]
    • Military operations involving explosion of vehicle-borne improvised explosive device [IED]
    • Military operations involving explosion of roadside improvised explosive device [IED]
  53. Y37.230
    Military operations involving explosion of improvised explosive device [IED], military personnel +7th: A D S
    Needs 7th characterExempt
  54. Y37.231
    Military operations involving explosion of improvised explosive device [IED], civilian +7th: A D S
    Needs 7th characterExempt
  55. Y37.24
    Military operations involving explosion due to accidental detonation and discharge of own munitions or munitions launch device
    Header
  56. Y37.240
    Military operations involving explosion due to accidental detonation and discharge of own munitions or munitions launch device, military personnel +7th: A D S
    Needs 7th characterExempt
  57. Y37.241
    Military operations involving explosion due to accidental detonation and discharge of own munitions or munitions launch device, civilian +7th: A D S
    Needs 7th characterExempt
  58. Y37.25
    Military operations involving fragments from munitions
    Header
  59. Y37.250
    Military operations involving fragments from munitions, military personnel +7th: A D S
    Needs 7th characterExempt
  60. Y37.251
    Military operations involving fragments from munitions, civilian +7th: A D S
    Needs 7th characterExempt
  61. Y37.26
    Military operations involving fragments of improvised explosive device [IED]
    Header
    Inclusion terms 3

    Inclusion terms

    • Military operations involving fragments of person-borne improvised explosive device [IED]
    • Military operations involving fragments of vehicle-borne improvised explosive device [IED]
    • Military operations involving fragments of roadside improvised explosive device [IED]
  62. Y37.260
    Military operations involving fragments of improvised explosive device [IED], military personnel +7th: A D S
    Needs 7th characterExempt
  63. Y37.261
    Military operations involving fragments of improvised explosive device [IED], civilian +7th: A D S
    Needs 7th characterExempt
  64. Y37.27
    Military operations involving fragments from weapons
    Header
  65. Y37.270
    Military operations involving fragments from weapons, military personnel +7th: A D S
    Needs 7th characterExempt
  66. Y37.271
    Military operations involving fragments from weapons, civilian +7th: A D S
    Needs 7th characterExempt
  67. Y37.29
    Military operations involving other explosions and fragments
    Header
    Inclusion terms 3

    Inclusion terms

    • Military operations involving explosion of grenade
    • Military operations involving explosions of land mine
    • Military operations involving shrapnel NOS
  68. Y37.290
    Military operations involving other explosions and fragments, military personnel +7th: A D S
    Needs 7th characterExempt
  69. Y37.291
    Military operations involving other explosions and fragments, civilian +7th: A D S
    Needs 7th characterExempt
  70. Y37.3
    Military operations involving fires, conflagrations and hot substances
    Header
    Inclusion terms 1, Excludes1 4

    Inclusion terms

    • Military operations involving smoke, fumes, and heat from fires, conflagrations and hot substances

    Excludes1

    • military operations involving fires and conflagrations aboard military aircraft (Y37.1-) Y37.1
    • military operations involving fires and conflagrations aboard military watercraft (Y37.0-) Y37.0
    • military operations involving fires and conflagrations caused indirectly by conventional weapons (Y37.2-) Y37.2
    • military operations involving fires and thermal effects of nuclear weapons (Y36.53-) Y36.53
  71. Y37.30
    Military operations involving unspecified fire, conflagration and hot substance
    Header
  72. Y37.300
    Military operations involving unspecified fire, conflagration and hot substance, military personnel +7th: A D S
    Needs 7th characterExempt
  73. Y37.301
    Military operations involving unspecified fire, conflagration and hot substance, civilian +7th: A D S
    Needs 7th characterExempt
  74. Y37.31
    Military operations involving gasoline bomb
    Header
    Inclusion terms 2

    Inclusion terms

    • Military operations involving incendiary bomb
    • Military operations involving petrol bomb
  75. Y37.310
    Military operations involving gasoline bomb, military personnel +7th: A D S
    Needs 7th characterExempt
  76. Y37.311
    Military operations involving gasoline bomb, civilian +7th: A D S
    Needs 7th characterExempt
  77. Y37.32
    Military operations involving incendiary bullet
    Header
  78. Y37.320
    Military operations involving incendiary bullet, military personnel +7th: A D S
    Needs 7th characterExempt
  79. Y37.321
    Military operations involving incendiary bullet, civilian +7th: A D S
    Needs 7th characterExempt
  80. Y37.33
    Military operations involving flamethrower
    Header
  81. Y37.330
    Military operations involving flamethrower, military personnel +7th: A D S
    Needs 7th characterExempt
  82. Y37.331
    Military operations involving flamethrower, civilian +7th: A D S
    Needs 7th characterExempt
  83. Y37.39
    Military operations involving other fires, conflagrations and hot substances
    Header
  84. Y37.390
    Military operations involving other fires, conflagrations and hot substances, military personnel +7th: A D S
    Needs 7th characterExempt
  85. Y37.391
    Military operations involving other fires, conflagrations and hot substances, civilian +7th: A D S
    Needs 7th characterExempt
  86. Y37.4
    Military operations involving firearm discharge and other forms of conventional warfare
    Header
  87. Y37.41
    Military operations involving rubber bullets
    Header
  88. Y37.410
    Military operations involving rubber bullets, military personnel +7th: A D S
    Needs 7th characterExempt
  89. Y37.411
    Military operations involving rubber bullets, civilian +7th: A D S
    Needs 7th characterExempt
  90. Y37.42
    Military operations involving firearms pellets
    Header
  91. Y37.420
    Military operations involving firearms pellets, military personnel +7th: A D S
    Needs 7th characterExempt
  92. Y37.421
    Military operations involving firearms pellets, civilian +7th: A D S
    Needs 7th characterExempt
  93. Y37.43
    Military operations involving other firearms discharge
    Header
    Inclusion terms 1, Excludes1 2

    Inclusion terms

    • Military operations involving bullets NOS

    Excludes1

    • military operations involving munitions fragments (Y37.25-) Y37.25
    • military operations involving incendiary bullets (Y37.32-) Y37.32
  94. Y37.430
    Military operations involving other firearms discharge, military personnel +7th: A D S
    Needs 7th characterExempt
  95. Y37.431
    Military operations involving other firearms discharge, civilian +7th: A D S
    Needs 7th characterExempt
  96. Y37.44
    Military operations involving unarmed hand to hand combat
    Header
    Excludes1 3

    Excludes1

    • military operations involving combat using blunt or piercing object (Y37.45-) Y37.45
    • military operations involving intentional restriction of air and airway (Y37.46-) Y37.46
    • military operations involving unintentional restriction of air and airway (Y37.47-) Y37.47
  97. Y37.440
    Military operations involving unarmed hand to hand combat, military personnel +7th: A D S
    Needs 7th characterExempt
  98. Y37.441
    Military operations involving unarmed hand to hand combat, civilian +7th: A D S
    Needs 7th characterExempt
  99. Y37.45
    Military operations involving combat using blunt or piercing object
    Header
  100. Y37.450
    Military operations involving combat using blunt or piercing object, military personnel +7th: A D S
    Needs 7th characterExempt
  101. Y37.451
    Military operations involving combat using blunt or piercing object, civilian +7th: A D S
    Needs 7th characterExempt
  102. Y37.46
    Military operations involving intentional restriction of air and airway
    Header
  103. Y37.460
    Military operations involving intentional restriction of air and airway, military personnel +7th: A D S
    Needs 7th characterExempt
  104. Y37.461
    Military operations involving intentional restriction of air and airway, civilian +7th: A D S
    Needs 7th characterExempt
  105. Y37.47
    Military operations involving unintentional restriction of air and airway
    Header
  106. Y37.470
    Military operations involving unintentional restriction of air and airway, military personnel +7th: A D S
    Needs 7th characterExempt
  107. Y37.471
    Military operations involving unintentional restriction of air and airway, civilian +7th: A D S
    Needs 7th characterExempt
  108. Y37.49
    Military operations involving other forms of conventional warfare
    Header
  109. Y37.490
    Military operations involving other forms of conventional warfare, military personnel +7th: A D S
    Needs 7th characterExempt
  110. Y37.491
    Military operations involving other forms of conventional warfare, civilian +7th: A D S
    Needs 7th characterExempt
  111. Y37.5
    Military operations involving nuclear weapons
    Header
    Inclusion terms 1

    Inclusion terms

    • Military operation involving dirty bomb NOS
  112. Y37.50
    Military operations involving unspecified effect of nuclear weapon
    Header
  113. Y37.500
    Military operations involving unspecified effect of nuclear weapon, military personnel +7th: A D S
    Needs 7th characterExempt
  114. Y37.501
    Military operations involving unspecified effect of nuclear weapon, civilian +7th: A D S
    Needs 7th characterExempt
  115. Y37.51
    Military operations involving direct blast effect of nuclear weapon
    Header
    Inclusion terms 1

    Inclusion terms

    • Military operations involving blast pressure of nuclear weapon
  116. Y37.510
    Military operations involving direct blast effect of nuclear weapon, military personnel +7th: A D S
    Needs 7th characterExempt
  117. Y37.511
    Military operations involving direct blast effect of nuclear weapon, civilian +7th: A D S
    Needs 7th characterExempt
  118. Y37.52
    Military operations involving indirect blast effect of nuclear weapon
    Header
    Inclusion terms 2

    Inclusion terms

    • Military operations involving being thrown by blast of nuclear weapon
    • Military operations involving being struck or crushed by blast debris of nuclear weapon
  119. Y37.520
    Military operations involving indirect blast effect of nuclear weapon, military personnel +7th: A D S
    Needs 7th characterExempt
  120. Y37.521
    Military operations involving indirect blast effect of nuclear weapon, civilian +7th: A D S
    Needs 7th characterExempt
  121. Y37.53
    Military operations involving thermal radiation effect of nuclear weapon
    Header
    Inclusion terms 2

    Inclusion terms

    • Military operations involving direct heat from nuclear weapon
    • Military operation involving fireball effects from nuclear weapon
  122. Y37.530
    Military operations involving thermal radiation effect of nuclear weapon, military personnel +7th: A D S
    Needs 7th characterExempt
  123. Y37.531
    Military operations involving thermal radiation effect of nuclear weapon, civilian +7th: A D S
    Needs 7th characterExempt
  124. Y37.54
    Military operation involving nuclear radiation effects of nuclear weapon
    Header
    Inclusion terms 4

    Inclusion terms

    • Military operation involving acute radiation exposure from nuclear weapon
    • Military operation involving exposure to immediate ionizing radiation from nuclear weapon
    • Military operation involving fallout exposure from nuclear weapon
    • Military operation involving secondary effects of nuclear weapons
  125. Y37.540
    Military operation involving nuclear radiation effects of nuclear weapon, military personnel +7th: A D S
    Needs 7th characterExempt
  126. Y37.541
    Military operation involving nuclear radiation effects of nuclear weapon, civilian +7th: A D S
    Needs 7th characterExempt
  127. Y37.59
    Military operation involving other effects of nuclear weapons
    Header
  128. Y37.590
    Military operation involving other effects of nuclear weapons, military personnel +7th: A D S
    Needs 7th characterExempt
  129. Y37.591
    Military operation involving other effects of nuclear weapons, civilian +7th: A D S
    Needs 7th characterExempt
  130. Y37.6
    Military operations involving biological weapons
    Header
  131. Y37.6X
    Military operations involving biological weapons
    Header
  132. Y37.6X0
    Military operations involving biological weapons, military personnel +7th: A D S
    Needs 7th characterExempt
  133. Y37.6X1
    Military operations involving biological weapons, civilian +7th: A D S
    Needs 7th characterExempt
  134. Y37.7
    Military operations involving chemical weapons and other forms of unconventional warfare
    Header
    Excludes1 1

    Excludes1

    • military operations involving incendiary devices (Y36.3-, Y36.5-) Y36.3 Y36.5
  135. Y37.7X
    Military operations involving chemical weapons and other forms of unconventional warfare
    Header
  136. Y37.7X0
    Military operations involving chemical weapons and other forms of unconventional warfare, military personnel +7th: A D S
    Needs 7th characterExempt
  137. Y37.7X1
    Military operations involving chemical weapons and other forms of unconventional warfare, civilian +7th: A D S
    Needs 7th characterExempt
  138. Y37.9
    Other and unspecified military operations
    Header
  139. Y37.90
    Military operations, unspecified +7th: A D S
    Needs 7th characterExempt
  140. Y37.91
    Military operations involving unspecified weapon of mass destruction [WMD] +7th: A D S
    Needs 7th characterExempt
  141. Y37.92
    Military operations involving friendly fire +7th: A D S
    Needs 7th characterExempt
  142. Y37.A
    Blast overpressure in military operations
    Header
    Code also 5

    Code also

    • type of explosive, if known
    • accidental detonation of onboard munitions (Y37.140) Y37.140
    • explosion of grenade (Y37.290) Y37.290
    • explosion of torpedo (Y37.040) Y37.040
    • improvised explosive device (Y37.230) Y37.230
  143. Y37.A1
    Low level blast overpressure in military operations +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 2

    Inclusion terms

    • LLB overpressure in military operations
    • Low level blast overpressure due to explosion in military operations
  144. Y37.A2
    High level blast overpressure in military operations +7th: A D S
    Needs 7th characterExempt
    Inclusion terms 2

    Inclusion terms

    • High level blast overpressure due to explosion in military operations
    • HLB overpressure in military operations

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At Y37

Includes

  • injuries to military personnel and civilians occurring during peacetime on military property and during routine military exercises and operations

Excludes1

  • military aircraft involved in aircraft accident with civilian aircraft (V97.81-) V97.81
  • military vehicles involved in transport accident with civilian vehicle (V09.01, V09.21, V19.81, V29.818, V39.81, V49.81, V59.81, V69.81, V79.81) V09.01 V09.21 V19.81 V29.818 V39.81 V49.81 V59.81 V69.81 V79.81
  • military watercraft involved in water transport accident with civilian watercraft (V94.81-) V94.81
  • war operations (Y36.-) Y36

Notes that also apply

Chapter 20 instructions (Notes 1): printed on the chapter 20 page.

7th characters

7th characters for Y37 defined here

The appropriate 7th character is to be added to each code from category Y37

7th characters for Y37
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Hierarchy