2026 ICD-10-CM Diagnosis Code Y36.A1XA

Low level blast overpressure in war operations, initial encounter

ICD-10-CM Code:: Y36.A1XA
ICD-10 Code for:: Low level blast overpressure in war operations, init
Is Billable?: Yes - Valid for Submission
Code Navigator:

Y36.A1XA is a billable diagnosis code used to specify a medical diagnosis of low level blast overpressure in war operations, initial encounter. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

Y36.A1XA is an initial encounter code, includes a 7th character and should be used while the patient is receiving active treatment for a condition like low level blast overpressure in war operations. According to ICD-10-CM Guidelines an "initial encounter" doesn't necessarily means "initial visit". The 7th character should be used when the patient is undergoing active treatment regardless if new or different providers saw the patient over the course of a treatment. The appropriate 7th character codes should also be used even if the patient delayed seeking treatment for a condition.

Table of Contents

Code Information
2026 ICD-10 Code
Tabular List of Diseases and Injuries
Present on Admission (POA)
Replacement Code
Patient Education
Other Codes Used Similar Conditions
Code History

Code Classification

External causes of morbidity and mortality
V01–Y99
- Legal intervention, operations of war, military operations, and terrorism
  Y35-Y38
  - Operations of war
    Y36

New 2026 ICD-10-CM Code

Y36.A1XA is new to ICD-10-CM code set for the FY 2026, effective October 1, 2025. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2025. This is a new and revised code for the FY 2026 (October 1, 2025 - September 30, 2026).

Present on Admission (POA)

Y36.A1XA is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here.

CMS POA Indicator Options and Definitions

POA Indicator: Y

Reason: Diagnosis was present at time of inpatient admission.

CMS Pays CC/MCC DRG? YES

POA Indicator: N

Reason: Diagnosis was not present at time of inpatient admission.

CMS Pays CC/MCC DRG? NO

POA Indicator: U

Reason: Documentation insufficient to determine if the condition was present at the time of inpatient admission.

CMS Pays CC/MCC DRG? NO

POA Indicator: W

Reason: Clinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.

CMS Pays CC/MCC DRG? YES

POA Indicator: 1

Reason: Unreported/Not used - Exempt from POA reporting.

CMS Pays CC/MCC DRG? NO

Replacement Code

Y36A1XA replaces the following previously assigned ICD-10-CM code(s):

Y36.90XA - War operations, unspecified, initial encounter

Other ICD-10-CM Codes Commonly Used for Similar Conditions

Filter related codes list:

Y36 Operations of war
Y36.0 War operations involving explosion of marine weapons
Y36.00 War operations involving explosion of unspecified marine weapon
Y36.000 War operations involving explosion of unspecified marine weapon, military personnel
Y36.000A War operations involving explosion of unspecified marine weapon, military personnel, initial encounter
Y36.000D War operations involving explosion of unspecified marine weapon, military personnel, subsequent encounter
Y36.000S War operations involving explosion of unspecified marine weapon, military personnel, sequela
Y36.001 War operations involving explosion of unspecified marine weapon, civilian
Y36.001A War operations involving explosion of unspecified marine weapon, civilian, initial encounter
Y36.001D War operations involving explosion of unspecified marine weapon, civilian, subsequent encounter
Y36.001S War operations involving explosion of unspecified marine weapon, civilian, sequela
Y36.01 War operations involving explosion of depth-charge
Y36.010 War operations involving explosion of depth-charge, military personnel
Y36.010A War operations involving explosion of depth-charge, military personnel, initial encounter
Y36.010D War operations involving explosion of depth-charge, military personnel, subsequent encounter
Y36.010S War operations involving explosion of depth-charge, military personnel, sequela
Y36.011 War operations involving explosion of depth-charge, civilian
Y36.011A War operations involving explosion of depth-charge, civilian, initial encounter
Y36.011D War operations involving explosion of depth-charge, civilian, subsequent encounter
Y36.011S War operations involving explosion of depth-charge, civilian, sequela
Y36.02 War operations involving explosion of marine mine
Y36.020 War operations involving explosion of marine mine, military personnel
Y36.020A War operations involving explosion of marine mine, military personnel, initial encounter
Y36.020D War operations involving explosion of marine mine, military personnel, subsequent encounter
Y36.020S War operations involving explosion of marine mine, military personnel, sequela
Y36.021 War operations involving explosion of marine mine, civilian
Y36.021A War operations involving explosion of marine mine, civilian, initial encounter
Y36.021D War operations involving explosion of marine mine, civilian, subsequent encounter
Y36.021S War operations involving explosion of marine mine, civilian, sequela
Y36.03 War operations involving explosion of sea-based artillery shell
Y36.030 War operations involving explosion of sea-based artillery shell, military personnel
Y36.030A War operations involving explosion of sea-based artillery shell, military personnel, initial encounter
Y36.030D War operations involving explosion of sea-based artillery shell, military personnel, subsequent encounter
Y36.030S War operations involving explosion of sea-based artillery shell, military personnel, sequela
Y36.031 War operations involving explosion of sea-based artillery shell, civilian
Y36.031A War operations involving explosion of sea-based artillery shell, civilian, initial encounter
Y36.031D War operations involving explosion of sea-based artillery shell, civilian, subsequent encounter
Y36.031S War operations involving explosion of sea-based artillery shell, civilian, sequela
Y36.04 War operations involving explosion of torpedo
Y36.040 War operations involving explosion of torpedo, military personnel
Y36.040A War operations involving explosion of torpedo, military personnel, initial encounter
Y36.040D War operations involving explosion of torpedo, military personnel, subsequent encounter
Y36.040S War operations involving explosion of torpedo, military personnel, sequela
Y36.041 War operations involving explosion of torpedo, civilian
Y36.041A War operations involving explosion of torpedo, civilian, initial encounter
Y36.041D War operations involving explosion of torpedo, civilian, subsequent encounter
Y36.041S War operations involving explosion of torpedo, civilian, sequela
Y36.05 War operations involving accidental detonation of onboard marine weapons
Y36.050 War operations involving accidental detonation of onboard marine weapons, military personnel
Y36.050A War operations involving accidental detonation of onboard marine weapons, military personnel, initial encounter
Y36.050D War operations involving accidental detonation of onboard marine weapons, military personnel, subsequent encounter

Code History

FY 2026 - Code Added, effective from 10/1/2025 through 9/30/2026