DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T67 Effects of heat and light

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

T67 is not billable. The category heads 36 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

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. T67 Effects of heat and light
Billable codes
36
Subdivisions
10
CC / MCC codes
3 / 0
HCC V28 codes
0
New FY2027
0
Index entries
57

Codes in T67

  1. T67.0
    Heatstroke and sunstroke
    Header
    Use additional code 4

    Use additional code

    • code(s) to identify any associated complications of heatstroke, such as:
    • coma and stupor (R40.-) R40
    • rhabdomyolysis (M62.82) M62.82
    • systemic inflammatory response syndrome (R65.1-) R65.1
  2. T67.01
    Heatstroke and sunstroke +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 4

    Inclusion terms

    • Heat apoplexy
    • Heat pyrexia
    • Siriasis
    • Thermoplegia
  3. T67.02
    Exertional heatstroke +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  4. T67.09
    Other heatstroke and sunstroke +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  5. T67.1
    Heat syncope +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Heat collapse
  6. T67.2
    Heat cramp +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  7. T67.3
    Heat exhaustion, anhydrotic +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Heat prostration due to water depletion

    Excludes1

    • heat exhaustion due to salt depletion (T67.4) T67.4
  8. T67.4
    Heat exhaustion due to salt depletion +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Heat prostration due to salt (and water) depletion
  9. T67.5
    Heat exhaustion, unspecified +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Heat prostration NOS
  10. T67.6
    Heat fatigue, transient +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  11. T67.7
    Heat edema +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  12. T67.8
    Other effects of heat and light +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  13. T67.9
    Effect of heat and light, 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

At T67

Excludes1

  • erythema [dermatitis] ab igne (L59.0) L59.0
  • malignant hyperpyrexia due to anesthesia (T88.3) T88.3
  • radiation-related disorders of the skin and subcutaneous tissue (L55-L59) L55 L59

Excludes2

  • burns (T20-T31) T20 T31
  • sunburn (L55.-) L55
  • sweat disorder due to heat (L74-L75) L74 L75

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 T67 defined here

The appropriate 7th character is to be added to each code from category T67

7th characters for T67
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

  • Ictus solaris, solis → T67.01
  • Insolation (sunstroke) → T67.01
  • Siriasis → T67.01
  • Sunstroke → T67.01
  • Thermoplegia → T67.01
  • Edsall's disease → T67.2
  • Heat (effects) → T67.9
  • Apoplexia, apoplexy, apoplecticheat → T67.01
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)heat (effects) → T67.01
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)thermic → T67.01
  • Heat (effects)apoplexy → T67.01
  • Heat (effects)fever → T67.01
  • Heat (effects)hyperpyrexia → T67.01
  • Heat (effects)pyrexia → T67.01
  • Heat (effects)stroke → T67.01
  • Hyperpyrexiaheat (effects) → T67.01
  • Pyrexia (of unknown origin)atmospheric → T67.01
  • Pyrexia (of unknown origin)heat → T67.01
  • Stroke (apoplectic) (brain) (ischemic) (paralytic)heat → T67.01
  • Stroke (apoplectic) (brain) (ischemic) (paralytic)sun → T67.01
  • Sunstrokespecified NEC → T67.09
  • Collapseheat → T67.1
  • Heat (effects)collapse → T67.1
  • Heat (effects)syncope → T67.1
  • Syncope (near) (pre-)heat → T67.1
  • Cramp(s)fireman → T67.2
  • Cramp(s)heat → T67.2
  • Cramp(s)stoker's → T67.2
  • Disease, diseasedEdsall's → T67.2
  • Heat (effects)cramps → T67.2
  • Exhaustion, exhaustive (physical NEC)heat → T67.5
  • Heat (effects)exhaustion → T67.5
  • Fatigueheat (transient) → T67.6
  • Heat (effects)fatigue (transient) → T67.6
  • Edema, edematous (infectious) (pitting) (toxic)heat → T67.7
  • Heat (effects)edema → T67.7
  • Heat (effects)specified effect NEC → T67.8
  • Heat (effects)excessive → T67.9
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)due toheat → T67.01
  • Heat (effects)strokeexertional → T67.02

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

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

Hierarchy