DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T70 Effects of air pressure and water pressure

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

T70 is not billable. The category heads 24 billable codes in FY2027, grouped under 7 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Index → code

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. T66-T78 Other and unspecified effects of external causes (T66-T78)
  3. T70 Effects of air pressure and water pressure
Billable codes
24
Subdivisions
7
CC / MCC codes
1 / 0
HCC V28 codes
0
New FY2027
0
Index entries
101

Codes in T70

  1. T70.0
    Otitic barotrauma +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 2

    Inclusion terms

    • Aero-otitis media
    • Effects of change in ambient atmospheric pressure or water pressure on ears
  2. T70.1
    Sinus barotrauma +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 2

    Inclusion terms

    • Aerosinusitis
    • Effects of change in ambient atmospheric pressure on sinuses
  3. T70.2
    Other and unspecified effects of high altitude
    Header
    Excludes2 1

    Excludes2

    • polycythemia due to high altitude (D75.1) D75.1
  4. T70.20
    Unspecified effects of high altitude +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  5. T70.29
    Other effects of high altitude +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 5

    Inclusion terms

    • Alpine sickness
    • Anoxia due to high altitude
    • Barotrauma NOS
    • Hypobaropathy
    • Mountain sickness
  6. T70.3
    Caisson disease [decompression sickness] +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 2

    Inclusion terms

    • Compressed-air disease
    • Diver's palsy or paralysis
  7. T70.4
    Effects of high-pressure fluids +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 3

    Inclusion terms

    • Hydraulic jet injection (industrial)
    • Pneumatic jet injection (industrial)
    • Traumatic jet injection (industrial)
  8. T70.8
    Other effects of air pressure and water pressure +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  9. T70.9
    Effect of air pressure and water pressure, unspecified +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).

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

Notes that also apply

Block T66-T78 instructions (Code also 6): printed on the block page.

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

7th characters

7th characters for T70 defined here

The appropriate 7th character is to be added to each code from category T70

7th characters for T70
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

  • Aero-otitis media → T70.0
  • Aerotitis → T70.0
  • Barotitis → T70.0
  • Aerosinusitis → T70.1
  • Barosinusitis → T70.1
  • Acosta's disease → T70.29
  • Aerodontalgia → T70.29
  • Alpine sickness → T70.29
  • Andes disease → T70.29
  • Barodontalgia → T70.29
  • Barotrauma → T70.29
  • Hypobarism → T70.29
  • Hypobaropathy → T70.29
  • Monge's disease → T70.29
  • Aerobullosis → T70.3
  • Aeroembolism → T70.3
  • Bends → T70.3
  • Caisson disease → T70.3
  • Chokes (resulting from bends) → T70.3
  • Compressed air disease → T70.3
  • Decompression sickness → T70.3
  • Diver's palsy, paralysis or squeeze → T70.3
  • Dysbarism → T70.3
  • Squeeze, diver's → T70.3
  • Injection, traumatic jet (air) (industrial) (water) (paint or dye) → T70.4
  • Aviator'sear → T70.0
  • Barotraumaotitic → T70.0
  • Deafness (acquired) (complete) (hereditary) (partial)aviation → T70.0
  • Barotraumasinus → T70.1
  • Sinusitis (accessory) (chronic) (hyperplastic) (nasal) (nonpurulent) (purulent)due to high altitude → T70.1
  • Disease, diseasedaltitude → T70.20
  • Highaltitude effects → T70.20
  • Sicknessaltitude → T70.20
  • Anoxia (pathological)altitude → T70.29
  • Barotraumaodontalgia → T70.29
  • Disease, diseasedAcosta's → T70.29
  • Disease, diseasedalpine → T70.29
  • Disease, diseasedAndes → T70.29
  • Disease, diseasedMonge's → T70.29
  • Effect, adversehigh altitude NEC → T70.29

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

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

Hierarchy