DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T27 Burn and corrosion of respiratory tract

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

T27 is not billable. The category heads 24 billable codes in FY2027, grouped under 8 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

  • Inhalationflame → T27.3
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)larynx → T27.4
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)trachea → T27.4

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. T26-T28 Burns and corrosions confined to eye and internal organs (T26-T28)
  3. T27 Burn and corrosion of respiratory tract
Billable codes
24
Subdivisions
8
CC / MCC codes
8 / 0
HCC V28 codes
0
New FY2027
0
Index entries
16

Codes in T27

  1. T27.0
    Burn of larynx and trachea +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  2. T27.1
    Burn involving larynx and trachea with lung +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  3. T27.2
    Burn of other parts of respiratory tract +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Burn of thoracic cavity
  4. T27.3
    Burn of respiratory tract, part unspecified +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  5. T27.4
    Corrosion of larynx and trachea +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Code first 1

    Code first

    • (T51-T65) to identify chemical and intent T51 T65
  6. T27.5
    Corrosion involving larynx and trachea with lung +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Code first 1

    Code first

    • (T51-T65) to identify chemical and intent T51 T65
  7. T27.6
    Corrosion of other parts of respiratory tract +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Code first 1

    Code first

    • (T51-T65) to identify chemical and intent T51 T65
  8. T27.7
    Corrosion of respiratory tract, part unspecified +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Code first 1

    Code first

    • (T51-T65) to identify chemical and intent T51 T65

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).

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 T27

Use additional code

  • external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98) X00 X19 X75 X77 X96 X98
  • external cause code to identify place (Y92) Y92

Notes that also apply

Instructions for the group T20-T32 (Includes 10, Excludes2 3): printed on the chapter 19 page.

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

7th characters

7th characters for T27 defined here

The appropriate 7th character is to be added to each code from category T27

7th characters for T27
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

  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)larynx → T27.0
  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)trachea → T27.0
  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)lung (with larynx and trachea) → T27.1
  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)respiratory tract → T27.3
  • Inhalationflame → T27.3
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)epiglottis → T27.4
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)larynx → T27.4
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)trachea → T27.4
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)lung (with larynx and trachea) → T27.5
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)respiratory tract → T27.7
  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)larynxwith lung → T27.1
  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)tracheawith lung → T27.1
  • Burn (electricity) (flame) (hot gas, liquid or hot object) (radiation) (steam) (thermal)respiratory tractspecified part NEC → T27.2
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)larynxwith lung → T27.5
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)tracheawith lung → T27.5
  • Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal)respiratory tractspecified part NEC → T27.6

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

Hierarchy