2025 Initial ICD-10-CM Codes - Page 30
The 2025 Initial ICD-10-CM Codes list includes 14,552 diagnosis codes used when a patient is receiving active treatment for the first time for a particular condition. Per ICD-10-CM guidelines, an initial encounter does not always mean the first visit; it refers to the active treatment phase, which may include multiple visits. Coders and billers should select these codes when services such as surgery, medication, or therapy are being performed. Accurate use of initial encounter codes is crucial for claim approval and ensures that reimbursement reflects the intensity of treatment provided.
Y37.491A - Military operations involving other forms of conventional warfare, civilian, initial encounter Billable
Y37.500A - Military operations involving unspecified effect of nuclear weapon, military personnel, initial encounter Billable
Y37.501A - Military operations involving unspecified effect of nuclear weapon, civilian, initial encounter Billable
Y37.510A - Military operations involving direct blast effect of nuclear weapon, military personnel, initial encounter Billable
Y37.511A - Military operations involving direct blast effect of nuclear weapon, civilian, initial encounter Billable
Y37.520A - Military operations involving indirect blast effect of nuclear weapon, military personnel, initial encounter Billable
Y37.521A - Military operations involving indirect blast effect of nuclear weapon, civilian, initial encounter Billable
Y37.530A - Military operations involving thermal radiation effect of nuclear weapon, military personnel, initial encounter Billable
Y37.531A - Military operations involving thermal radiation effect of nuclear weapon, civilian, initial encounter Billable
Y37.540A - Military operation involving nuclear radiation effects of nuclear weapon, military personnel, initial encounter Billable
Y37.541A - Military operation involving nuclear radiation effects of nuclear weapon, civilian, initial encounter Billable
Y37.590A - Military operation involving other effects of nuclear weapons, military personnel, initial encounter Billable
Y37.591A - Military operation involving other effects of nuclear weapons, civilian, initial encounter Billable
Y37.6X0A - Military operations involving biological weapons, military personnel, initial encounter Billable
Y37.6X1A - Military operations involving biological weapons, civilian, initial encounter Billable
Y37.7X0A - Military operations involving chemical weapons and other forms of unconventional warfare, military personnel, initial encounter Billable
Y37.7X1A - Military operations involving chemical weapons and other forms of unconventional warfare, civilian, initial encounter Billable
Y37.90XA - Military operations, unspecified, initial encounter Billable
Y37.91XA - Military operations involving unspecified weapon of mass destruction [WMD], initial encounter Billable
Y37.92XA - Military operations involving friendly fire, initial encounter Billable
Y38.0X1A - Terrorism involving explosion of marine weapons, public safety official injured, initial encounter Billable
Y38.0X2A - Terrorism involving explosion of marine weapons, civilian injured, initial encounter Billable
Y38.0X3A - Terrorism involving explosion of marine weapons, terrorist injured, initial encounter Billable
Y38.1X1A - Terrorism involving destruction of aircraft, public safety official injured, initial encounter Billable
Y38.1X2A - Terrorism involving destruction of aircraft, civilian injured, initial encounter Billable
Y38.1X3A - Terrorism involving destruction of aircraft, terrorist injured, initial encounter Billable
Y38.2X1A - Terrorism involving other explosions and fragments, public safety official injured, initial encounter Billable
Y38.2X2A - Terrorism involving other explosions and fragments, civilian injured, initial encounter Billable
Y38.2X3A - Terrorism involving other explosions and fragments, terrorist injured, initial encounter Billable
Y38.3X1A - Terrorism involving fires, conflagration and hot substances, public safety official injured, initial encounter Billable
Y38.3X2A - Terrorism involving fires, conflagration and hot substances, civilian injured, initial encounter Billable
Y38.3X3A - Terrorism involving fires, conflagration and hot substances, terrorist injured, initial encounter Billable
Y38.4X1A - Terrorism involving firearms, public safety official injured, initial encounter Billable
Y38.4X2A - Terrorism involving firearms, civilian injured, initial encounter Billable
Y38.4X3A - Terrorism involving firearms, terrorist injured, initial encounter Billable
Y38.5X1A - Terrorism involving nuclear weapons, public safety official injured, initial encounter Billable
Y38.5X2A - Terrorism involving nuclear weapons, civilian injured, initial encounter Billable
Y38.5X3A - Terrorism involving nuclear weapons, terrorist injured, initial encounter Billable
Y38.6X1A - Terrorism involving biological weapons, public safety official injured, initial encounter Billable
Y38.6X2A - Terrorism involving biological weapons, civilian injured, initial encounter Billable
Y38.6X3A - Terrorism involving biological weapons, terrorist injured, initial encounter Billable
Y38.7X1A - Terrorism involving chemical weapons, public safety official injured, initial encounter Billable
Y38.7X2A - Terrorism involving chemical weapons, civilian injured, initial encounter Billable
Y38.7X3A - Terrorism involving chemical weapons, terrorist injured, initial encounter Billable
Y38.80XA - Terrorism involving unspecified means, initial encounter Billable
Y38.811A - Terrorism involving suicide bomber, public safety official injured, initial encounter Billable
Y38.812A - Terrorism involving suicide bomber, civilian injured, initial encounter Billable
Y38.891A - Terrorism involving other means, public safety official injured, initial encounter Billable
Y38.892A - Terrorism involving other means, civilian injured, initial encounter Billable
Y38.893A - Terrorism involving other means, terrorist injured, initial encounter Billable
Y38.9X1A - Terrorism, secondary effects, public safety official injured, initial encounter Billable
Y38.9X2A - Terrorism, secondary effects, civilian injured, initial encounter Billable
