ICD-10-CM 2027 diagnosis code
T79.0XXAAir embolism (traumatic), initial encounter
T79.0XXA is a valid, billable ICD-10-CM code for air embolism (traumatic), initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T79.0XXA
T79.0XXA is the ICD-10-CM diagnosis code for air embolism (traumatic), initial encounter. It belongs to category T79 (certain early complications of trauma, not elsewhere classified), block T79 (certain early complications of trauma) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 175 (Pulmonary Embolism with MCC or Acute Cor Pulmonale, relative weight 1.3652), DRG 176 (Pulmonary Embolism without MCC, relative weight 0.8063), DRG 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 963 (Other Multiple Significant Trauma with MCC, relative weight 2.6363), DRG 964 (Other Multiple Significant Trauma with CC, relative weight 1.4972) and 1 more, in MDC 04 (Diseases and Disorders of the Respiratory System), MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 24 (Multiple Significant Trauma), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 958.0 (air embolism).
7th character
Ainitial encounter
CC/MCC status for this injury by encounter: MCC for A; Neither CC nor MCC for D, S.
Other encounter types for T79.0:
Notes that apply from higher levels
Instructions written at a parent level also apply to T79.0XXA.
Broader instructions also apply from Chapter 19: Injury, poisoning and certain other consequences of external causes.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 04 · Diseases and Disorders of the Respiratory System
MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period
MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period
ICD-9-CM equivalent
Converter →- 958.0Air embolismapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T79.0XXA
Is T79.0XXA billable?
- Yes. T79.0XXA is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "A" at the end of T79.0XXA mean?
- It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.
Can T79.0XXA be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict T79.0XXA as a principal diagnosis.
Is T79.0XXA a CC or MCC?
- T79.0XXA is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does T79.0XXA group to?
- T79.0XXA is used in the MS-DRG v44.0 logic for MS-DRG 175 (Pulmonary Embolism with MCC or Acute Cor Pulmonale), MS-DRG 176 (Pulmonary Embolism without MCC), MS-DRG 791 (Prematurity with Major Problems), MS-DRG 793 (Full Term Neonate with Major Problems), MS-DRG 963 (Other Multiple Significant Trauma with MCC), MS-DRG 964 (Other Multiple Significant Trauma with CC) and 1 more. Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for T79.0XXA?
- The CMS General Equivalence Mappings map T79.0XXA to ICD-9-CM 958.0.