Alphabetic Index FY2027

T79.A0XD

Compartment syndrome, unspecified, subsequent encounter

FY2027Chapter 19: Injury, poisoning and certain other consequences of external causes/T79 Certain early complications of trauma

BillableComplete code, valid to report

T79.A0XD (also written T79A0XD) is a billable ICD-10-CM diagnosis code for compartment syndrome, unspecified, subsequent encounter. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 54 codes in category T79 (Certain early complications of trauma, not elsewhere classified). The Alphabetic Index lists it under 2 entries. Its 7th character, D, means subsequent encounter. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 7 Excludes2 entries.

7th character

Category T79 requires a 7th character. T79.A0 has only 5 characters, so a placeholder X fills the 6th position.

Assembled code T79.A0XD Open code

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.

Guidelines I.C.19.aInjuries: application of 7th charactersRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • code to identify any retained foreign body, if applicable (Z18.-)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from T79.A Traumatic compartment syndrome
  • fibromyalgia (M79.7)
  • nontraumatic compartment syndrome (M79.A-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from T79.A Traumatic compartment syndrome
  • traumatic ischemic infarction of muscle (T79.6)
Inherited from T79 Certain early complications of trauma, not elsewhere classified
  • acute respiratory distress syndrome (J80)
  • complications occurring during or following medical procedures (T80-T88)
  • complications of surgical and medical care NEC (T80-T88)
  • newborn respiratory distress syndrome (P22.0)
Also from chapter/block level (2 notes)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Inclusion terms

Conditions classified to this code.

Inherited from T79.A0 Compartment syndrome, unspecified
  • Compartment syndrome NOS

Notes

Also from chapter/block level (2 notes)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

Alphabetic Index terms

Terms the official Alphabetic Index lists for T79.A0. This code adds the 7th character. 2 entries