2026 ICD-10-CM Diagnosis Code T79.8XXAOther early complications of trauma, initial encounter

ICD-10-CM Codes›S00–T88›T79›T79

ICD-10-CM T79.8XXA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T79.8XXA is a billable ICD-10-CM diagnosis code for other early complications of trauma, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified injury.

Code Identity

ICD-10-CM Code
T79.8XXA
Billable Status
Yes — Valid for Submission
Code Describes
Other early complications of trauma, initial encounter
Short Description
Other early complications of trauma, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T79.8
Other early complications of trauma

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT79Certain early complications of trauma
CategoryT79Certain early complications of trauma, not elsewhere classified
This CodeT79.8XXAOther early complications of trauma, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired hypotonia
  • Acute confusional state, post-traumatic
  • Acute traumatic otitis externa
  • Acute-on-chronic respiratory failure
  • Acute-on-chronic respiratory failure following trauma
  • Alopecia due to friction and trauma
  • Anemia due to mechanical damage
  • Cerebrospinal fluid otorrhea
  • Chronic respiratory failure
  • Compression injury of nerve
  • Contracture of gastrocnemius muscle due to traumatic injury
  • Irritation of presacral tissue by content of ruptured viscera
  • Lymphedema due to trauma
  • Mucosal vesicle
  • Posttraumatic aphasia
  • Post-traumatic cerebrospinal otorrhea
  • Post-traumatic dementia with behavioral change
  • Post-traumatic eczema
  • Post-traumatic epilepsy
  • Post-traumatic hydrocele
  • Posttraumatic meningitis
  • Post-traumatic nerve entrapment
  • Post-traumatic scar
  • Post-traumatic sterility
  • Respiratory failure following trauma
  • Secondary eczematous condition
  • Sterility
  • Traumatic encephalopathy
  • Traumatic fat necrosis
  • Traumatic hemolytic anemia
  • Traumatic hypotonia
  • Traumatic iritis
  • Traumatic oral hemorrhagic bulla
  • Traumatic oral ulceration
  • Traumatic pneumonitis
  • Vesicular stomatitis

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Certain early complications of trauma, not elsewhere classified (T79). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ026
Other specified injury
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Vesicular Stomatitis

    a viral disease caused by at least two distinct species (serotypes) in the vesiculovirus genus: vesicular stomatitis indiana virus and vesicular stomatitis new jersey virus. it is characterized by vesicular eruptions on the oral mucosa in cattle, horses, pigs, and other animals. in humans, vesicular stomatitis causes an acute influenza-like illness.

  • Vesicular stomatitis Indiana virus

    the type species of vesiculovirus causing a disease symptomatically similar to foot-and-mouth disease in cattle, horses, and pigs. it may be transmitted to other species including humans, where it causes influenza-like symptoms.

  • Vesicular stomatitis New Jersey virus

    a species of vesiculovirus causing vesicular stomatitis primarily in cattle, horses, and pigs. it can be transmitted to humans where it causes influenza-like symptoms.

  • Vesiculovirus

    a genus of the family rhabdoviridae that infects a wide range of vertebrates and invertebrates. the type species is vesicular stomatitis indiana virus.

  • Cerebrospinal Fluid Otorrhea

    discharge of cerebrospinal fluid through the external auditory meatus or through the eustachian tube into the nasopharynx. this is usually associated with craniocerebral trauma (e.g., skull fracture involving the temporal bone;), neurosurgical procedures; or other conditions, but may rarely occur spontaneously. (from am j otol 1995 nov;16(6):765-71)

  • Traumatic Encephalopathy

    encephalopathy resulting from trauma.

  • Cerebrospinal Fluid Otorrhea

    discharge of cerebrospinal fluid through the ear structures.

Patient EducationClinical

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T79.8XXA to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
958.8 Early complic trauma NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T79.8XXAOverview

Is T79.8XXA (Other early complications of trauma) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other early complications of trauma, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T79.8XXA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other early complications of trauma, such as an emergency visit or first evaluation.

What MS-DRG does T79.8XXA group to?

When other early complications of trauma, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, 963, 964, 965, with relative weights from 0.9405 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T79.8XXA?

Under the General Equivalence Mappings, other early complications of trauma, initial encounter converts to ICD-9-CM 958.8 (early complic trauma NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.