Y37.A1XA – Low level blast overpressure in military operations, initial encounter

ICD-10-CM 2027 diagnosis code · Legal intervention, operations of war, military operations, and terrorism

Billable code

ICD-10-CM code Y37.A1XA

Code: Y37.A1XA (claims format: Y37A1XA)
Description: Low level blast overpressure in military operations, initial encounter
Short description: Low level blast overpressure in milt op, initial encounter
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 20. External causes of morbidity (V00-Y99)
Block: Y35-Y38 Legal intervention, operations of war, military operations, and terrorism
Parent codes: Y37 › Y37.A › Y37.A1

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care.

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Y37 – Military operations

Includes:

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

Excludes1 (not coded here):

military aircraft involved in aircraft accident with civilian aircraft (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)
military watercraft involved in water transport accident with civilian watercraft (V94.81-)
war operations (Y36.-)

7th character note:

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

Y37.A – Blast overpressure in military operations

Code also:

type of explosive, if known
accidental detonation of onboard munitions (Y37.140)
explosion of grenade (Y37.290)
explosion of torpedo (Y37.040)
improvised explosive device (Y37.230)

Y37.A1 – Low level blast overpressure in military operations

Applicable to:

LLB overpressure in military operations
Low level blast overpressure due to explosion in military operations

Related codes in Y37.A1

Frequently asked questions

What is ICD-10 code Y37.A1XA?

Y37.A1XA is the ICD-10-CM code for low level blast overpressure in military operations, initial encounter, in the block Y35-Y38 (Legal intervention, operations of war, military operations, and terrorism).

Is Y37.A1XA a billable code?

Yes. Y37.A1XA is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Y37.A1XA belong to?

It belongs to category Y37 – Military operations.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.