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Y37.A1XS ICD-10-CM Code: Low level blast overpressure in military operations, sequela

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

7th character
Required — see the character table on this page
Tabular directives
3 inclusion terms · 4 Excludes1 · 5 code-also instructions

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Y37.A1XS in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on Y37.A1XS itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

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

Source: inherited from Y37

Inclusion Terms

Alternative terms the tabular list files under this code.

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

Source: inherited from Y37.A1

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from Y37

Code Also

Additional codes that may be required to fully describe the encounter.

  • 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)

Source: inherited from Y37.A

7th Character Guide

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

  • A — initial encounter
  • D — subsequent encounter
  • S — sequela (this page’s code)

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

Y37.A1XA, Y37.A1XD, Y37.A1XS

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Code Overview

Low level blast overpressure in military operations, sequela is a billable ICD-10-CM diagnosis code (Y37.A1XS).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. A 7th character applies in this family. Confirm the documented encounter matches the character assigned. See the official 7th-character definitions and this code’s variants
  2. 5 Code Also notes — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
  3. 4 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

  • Principal-diagnosis restriction. External cause of morbidity codes (V, W, X and Y) describe the circumstance that caused an injury, not the condition treated. The Medicare Code Editor rejects them as a principal diagnosis; sequence the injury or condition first and report this code as secondary.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

Other codes that name Y37.A1XS or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 30 Excludes1 notes: V91 — Other injury due to accident to watercraft (via Y37.-), V93 — Other injury due to accident on board watercraft, without accident to watercraft (via Y37.-), W20 — Struck by thrown, projected or falling object (via Y37.-), W20-W49 — Exposure to inanimate mechanical forces (W20-W49) (via Y37.-), W21 — Striking against or struck by sports equipment (via Y37.-), W22 — Striking against or struck by other objects (via Y37.-), W23 — Caught, crushed, jammed or pinched in or between objects (via Y37.-), W24 — Contact with lifting and transmission devices, not elsewhere classified (via Y37.-), W25 — Contact with sharp glass (via Y37.-), W26 — Contact with other sharp objects (via Y37.-), W27 — Contact with nonpowered hand tool (via Y37.-), W28 — Contact with powered lawn mower (via Y37.-), W29 — Contact with other powered hand tools and household machinery (via Y37.-), W30 — Contact with agricultural machinery (via Y37.-), W31 — Contact with other and unspecified machinery (via Y37.-), W32 — Accidental handgun discharge and malfunction (via Y37.-), W33 — Accidental rifle, shotgun and larger firearm discharge and malfunction (via Y37.-), W34 — Accidental discharge and malfunction from other and unspecified firearms and guns (via Y37.-), W35 — Explosion and rupture of boiler (via Y37.-), W36 — Explosion and rupture of gas cylinder (via Y37.-), +10 more.

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Clinical classification (AHRQ CCSR):EXT030 — External cause codes: sequela.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (External cause codes: sequela).

+2321 more

Contextual Map

Every relationship of Y37.A1XS in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run Y37.A1XS with these 8 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes (30)

Clinical classification (CCSR)

Nearest codes (40)

Change history

Common coding questions

Does Y37.A1XS require a 7th character?

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

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Change history

  • FY2026 — October 1, 2025
    Added to the code set
    Low level blast overpressure in military operations, sequela
    FY2026 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Y37.A1XS in its code family, with their registry titles.

View all codes in the Y37 family