2024 ICD-10-CM Diagnosis Code W40.9XXD

Explosion of unspecified explosive materials, subsequent encounter

ICD-10-CM Code:
W40.9XXD
ICD-10 Code for:
Explosion of unspecified explosive materials, subs encntr
Is Billable?
Yes - Valid for Submission
Code Navigator:

Code Classification

  • External causes of morbidity and mortality
    (V01–Y99)
    • Exposure to inanimate mechanical forces
      (W20-W49)
      • Explosion of other materials
        (W40)

W40.9XXD is a billable diagnosis code used to specify a medical diagnosis of explosion of unspecified explosive materials, subsequent encounter. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

W40.9XXD is a subsequent encounter code, includes a 7th character and should be used after the patient has completed active treatment for a condition like explosion of unspecified explosive materials. According to ICD-10-CM Guidelines a "subsequent encounter" occurs when the patient is receiving routine care for the condition during the healing or recovery phase of treatment. Subsequent diagnosis codes are appropriate during the recovery phase, no matter how many times the patient has seen the provider for this condition. If the provider needs to adjust the patient's care plan due to a setback or other complication, the encounter becomes active again.

Unspecified diagnosis codes like W40.9XXD are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Accident caused by explosion
  • Accident caused by explosion and conflagration in commercial premises
  • Accident caused by explosion and conflagration in public building
  • Accident caused by explosion of bomb
  • Accident caused by explosive device
  • Accident caused by explosive material
  • Direct tissue damage due to blast
  • Explosion caused by conflagration in apartment
  • Explosion caused by conflagration in barn
  • Explosion caused by conflagration in boarding house
  • Explosion caused by conflagration in camping place
  • Explosion caused by conflagration in church
  • Explosion caused by conflagration in convalescent home
  • Explosion caused by conflagration in dormitory of educational institute
  • Explosion caused by conflagration in factory
  • Explosion caused by conflagration in farm outbuildings
  • Explosion caused by conflagration in farmhouse
  • Explosion caused by conflagration in hospital
  • Explosion caused by conflagration in hotel
  • Explosion caused by conflagration in house
  • Explosion caused by conflagration in lodging house
  • Explosion caused by conflagration in mobile home
  • Explosion caused by conflagration in private dwelling
  • Explosion caused by conflagration in private garage
  • Explosion caused by conflagration in rooming house
  • Explosion caused by conflagration in school
  • Explosion caused by conflagration in store
  • Explosion caused by conflagration in tenement
  • Explosion caused by conflagration in theater
  • Explosion caused by conflagration in travel trailer
  • Exposure to heat flash
  • Exposure to heat flash
  • Exposure to heat flash
  • Exposure to heat flash due to explosion in industry
  • Exposure to heat flash due to explosion in war
  • Exposure to heat flash in explosion
  • Exposure to heat flash in explosion
  • Injury due to explosion
  • Injury due to legal intervention by explosive
  • Struck by explosion

Clinical Classification

Present on Admission (POA)

W40.9XXD 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 IndicatorReason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert W40.9XXD to ICD-9-CM

  • ICD-9-CM Code: E923.9 - Explosives accident NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.