DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T79 Certain early complications of trauma, not elsewhere classified

  • Header · not billable
  • Codes take a 7th character

T79 is not billable. The category heads 54 billable codes in FY2027, grouped under 10 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

  • Bywaters' syndrome → T79.5
  • Feeble rapid pulse due to shock following injury → T79.4
  • Compartment syndrome (deep) (posterior) (traumatic) → T79.A0

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. T79 Certain early complications of trauma (T79)
  3. T79 Certain early complications of trauma, not elsewhere classified
Billable codes
54
Subdivisions
10
CC / MCC codes
11 / 4
HCC V28 codes
3
New FY2027
0
Index entries
65

Codes in T79

  1. T79.0
    Air embolism (traumatic) +7th: A D S
    Needs 7th characterMCC A267 (some 7th characters)Exempt: 2 of 3 7th characters
    Excludes1 4

    Excludes1

    • air embolism complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2) O00 O07 O08.2
    • air embolism complicating pregnancy, childbirth and the puerperium (O88.0) O88.0
    • air embolism following infusion, transfusion, and therapeutic injection (T80.0) T80.0
    • air embolism following procedure NEC (T81.7-) T81.7
  2. T79.1
    Fat embolism (traumatic) +7th: A D S
    Needs 7th characterMCC A267 (some 7th characters)Exempt: 2 of 3 7th characters
    Excludes1 3

    Excludes1

    • fat embolism complicating:
    • abortion or ectopic or molar pregnancy (O00-O07, O08.2) O00 O07 O08.2
    • pregnancy, childbirth and the puerperium (O88.8) O88.8
  3. T79.2
    Traumatic secondary and recurrent hemorrhage and seroma +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  4. T79.4
    Traumatic shock +7th: A D S
    Needs 7th characterMCC A†2 (some 7th characters)Exempt: 2 of 3 7th characters
    Inclusion terms 1, Excludes1 13

    Inclusion terms

    • Shock (immediate) (delayed) following injury

    Excludes1

    • anaphylactic shock due to adverse food reaction (T78.0-) T78.0
    • anaphylactic shock due to correct medicinal substance properly administered (T88.6) T88.6
    • anaphylactic shock due to serum (T80.5-) T80.5
    • anaphylactic shock NOS (T78.2) T78.2
    • electric shock (T75.4) T75.4
    • nontraumatic shock NEC (R57.-) R57
    • obstetric shock (O75.1) O75.1
    • postprocedural shock (T81.1-) T81.1
    • septic shock (R65.21) R65.21
    • shock complicating abortion or ectopic or molar pregnancy (O00-O07, O08.3) O00 O07 O08.3
    • shock due to anesthesia (T88.2) T88.2
    • shock due to lightning (T75.01) T75.01
    • shock NOS (R57.9) R57.9
  5. T79.5
    Traumatic anuria +7th: A D S
    Needs 7th characterMCC AExempt: 2 of 3 7th characters
    Inclusion terms 2

    Inclusion terms

    • Crush syndrome
    • Renal failure following crushing
  6. T79.6
    Traumatic ischemia of muscle +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 2, Excludes2 3

    Inclusion terms

    • Traumatic rhabdomyolysis
    • Volkmann's ischemic contracture

    Excludes2

    • anterior tibial syndrome (M76.8) M76.8
    • compartment syndrome (traumatic) (T79.A-) T79.A
    • nontraumatic ischemia of muscle (M62.2-) M62.2
  7. T79.7
    Traumatic subcutaneous emphysema +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Excludes2 2

    Excludes2

    • emphysema NOS (J43) J43
    • emphysema (subcutaneous) resulting from a procedure (T81.82) T81.82
  8. T79.A
    Traumatic compartment syndrome
    Header
    Excludes1 2, Excludes2 1

    Excludes1

    • fibromyalgia (M79.7) M79.7
    • nontraumatic compartment syndrome (M79.A-) M79.A

    Excludes2

    • traumatic ischemic infarction of muscle (T79.6) T79.6
  9. T79.A0
    Compartment syndrome, unspecified +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Compartment syndrome NOS
  10. T79.A1
    Traumatic compartment syndrome of upper extremity
    Header
    Inclusion terms 1

    Inclusion terms

    • Traumatic compartment syndrome of shoulder, arm, forearm, wrist, hand, and fingers
  11. T79.A11
    Traumatic compartment syndrome of right upper extremity +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  12. T79.A12
    Traumatic compartment syndrome of left upper extremity +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  13. T79.A19
    Traumatic compartment syndrome of unspecified upper extremity +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  14. T79.A2
    Traumatic compartment syndrome of lower extremity
    Header
    Inclusion terms 1

    Inclusion terms

    • Traumatic compartment syndrome of hip, buttock, thigh, leg, foot, and toes
  15. T79.A21
    Traumatic compartment syndrome of right lower extremity +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  16. T79.A22
    Traumatic compartment syndrome of left lower extremity +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  17. T79.A29
    Traumatic compartment syndrome of unspecified lower extremity +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  18. T79.A3
    Traumatic compartment syndrome of abdomen +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  19. T79.A9
    Traumatic compartment syndrome of other sites +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  20. T79.8
    Other early complications of trauma +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  21. T79.9
    Unspecified early complication of trauma +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card). † MCC only if the patient is discharged alive; otherwise neither CC nor MCC (Appendix C Part 2).

Sources of each column. Rows marked +7th need a 7th character: pick one to build the full code; its code card has its own flags.

Instructions

At T79

Excludes2

  • acute respiratory distress syndrome (J80) J80
  • complications occurring during or following medical procedures (T80-T88) T80 T88
  • complications of surgical and medical care NEC (T80-T88) T80 T88
  • newborn respiratory distress syndrome (P22.0) P22.0

Notes that also apply

Chapter 19 instructions (Notes 2, Excludes2 2, Use additional code 1): printed on the chapter 19 page.

7th characters

7th characters for T79 defined here

The appropriate 7th character is to be added to each code from category T79

7th characters for T79
7thMeaning (NCHS)
Ainitial encounter
Dsubsequent encounter
Ssequela

A code that takes a 7th character is invalid without it; the placeholder X fills a code shorter than 6 characters (Official Guidelines I.A.5). How 7th characters work.

Index entries

  • Feeble rapid pulse due to shock following injury → T79.4
  • Bywaters' syndrome → T79.5
  • Volkmann's ischemic contracture or paralysis (complicating trauma) → T79.6
  • Compartment syndrome (deep) (posterior) (traumatic) → T79.A0
  • Airembolism (artery) (cerebral) (any site) → T79.0
  • Embolism (multiple) (paradoxical)air (any site) (traumatic) → T79.0
  • Embolism (multiple) (paradoxical)fat (cerebral) (pulmonary) (systemic) → T79.1
  • Hemorrhage, hemorrhagic (concealed)recurring, following initial hemorrhage at time of injury → T79.2
  • Seromatraumatic, secondary and recurrent → T79.2
  • Decrease (d)respiration, due to shock following injury → T79.4
  • Hypovolemiatraumatic (shock) → T79.4
  • Pulsefeeble, rapid due to shock following injury → T79.4
  • Rapidfeeble pulse, due to shock, following injury → T79.4
  • Respirationdecreased due to shock, following injury → T79.4
  • Shocktraumatic (immediate) (delayed) → T79.4
  • Syndromeshock (traumatic) → T79.4
  • Anuriatraumatic (following crushing) → T79.5
  • Compressionsyndrome → T79.5
  • Crush, crushed, crushingsyndrome (complication of trauma) → T79.5
  • SyndromeBywaters' → T79.5
  • Syndromecompression → T79.5
  • Syndromecrush → T79.5
  • Contraction(s), contracture, contractedVolkmann's (ischemic) → T79.6
  • Disease, diseasedVolkmann's, acquired → T79.6
  • Ischemia, ischemicmuscle, traumatic → T79.6
  • Myositisfibrosa or fibrous (chronic), Volkmann's → T79.6
  • Paralysis, paralytic (complete) (incomplete)ischemic, Volkmann's (complicating trauma) → T79.6
  • Paralysis, paralytic (complete) (incomplete)Volkmann's (complicating trauma) → T79.6
  • Rhabdomyolysis (idiopathic) NECtraumatic → T79.6
  • SyndromeVolkmann's → T79.6
  • Aerodermectasiasubcutaneous (traumatic) → T79.7
  • Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)cellular tissue (traumatic) → T79.7
  • Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)connective tissue (traumatic) → T79.7
  • Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)laminated tissue → T79.7
  • Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)subcutaneous (traumatic) → T79.7
  • Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)traumatic (subcutaneous) → T79.7
  • Syndromecompartment (deep) (posterior) (traumatic) → T79.A0
  • Compartment syndrome (deep) (posterior) (traumatic)upper extremity (shoulder, arm, forearm, wrist, hand, fingers) → T79.A1
  • Compartment syndrome (deep) (posterior) (traumatic)lower extremity (hip, buttock, thigh, leg, foot, toes) → T79.A2
  • Compartment syndrome (deep) (posterior) (traumatic)abdomen → T79.A3

25 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.