DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T33 Superficial frostbite

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

T33 is not billable. The category heads 111 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

  • Frostbite (superficial) → T33.90
  • Frostbite (superficial)arm → T33.4-
  • Frostbite (superficial)ear → T33.01-

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. T33-T34 Frostbite (T33-T34)
  3. T33 Superficial frostbite
Billable codes
111
Subdivisions
10
CC / MCC codes
37 / 0
HCC V28 codes
0
New FY2027
0
Index entries
23

Codes in T33

  1. T33.0
    Superficial frostbite of head
    Header
  2. T33.01
    Superficial frostbite of ear
    Header
  3. T33.011
    Superficial frostbite of right ear +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  4. T33.012
    Superficial frostbite of left ear +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  5. T33.019
    Superficial frostbite of unspecified ear +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  6. T33.02
    Superficial frostbite of nose +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  7. T33.09
    Superficial frostbite of other part of head +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  8. T33.1
    Superficial frostbite of neck +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  9. T33.2
    Superficial frostbite of thorax +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  10. T33.3
    Superficial frostbite of abdominal wall, lower back and pelvis +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  11. T33.4
    Superficial frostbite of arm
    Header
    Excludes2 1

    Excludes2

    • superficial frostbite of wrist and hand (T33.5-) T33.5
  12. T33.40
    Superficial frostbite of unspecified arm +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  13. T33.41
    Superficial frostbite of right arm +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  14. T33.42
    Superficial frostbite of left arm +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  15. T33.5
    Superficial frostbite of wrist, hand, and fingers
    Header
  16. T33.51
    Superficial frostbite of wrist
    Header
  17. T33.511
    Superficial frostbite of right wrist +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  18. T33.512
    Superficial frostbite of left wrist +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  19. T33.519
    Superficial frostbite of unspecified wrist +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  20. T33.52
    Superficial frostbite of hand
    Header
    Excludes2 1

    Excludes2

    • superficial frostbite of fingers (T33.53-) T33.53
  21. T33.521
    Superficial frostbite of right hand +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  22. T33.522
    Superficial frostbite of left hand +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  23. T33.529
    Superficial frostbite of unspecified hand +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  24. T33.53
    Superficial frostbite of finger(s)
    Header
  25. T33.531
    Superficial frostbite of right finger(s) +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  26. T33.532
    Superficial frostbite of left finger(s) +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  27. T33.539
    Superficial frostbite of unspecified finger(s) +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  28. T33.6
    Superficial frostbite of hip and thigh
    Header
  29. T33.60
    Superficial frostbite of unspecified hip and thigh +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  30. T33.61
    Superficial frostbite of right hip and thigh +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  31. T33.62
    Superficial frostbite of left hip and thigh +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  32. T33.7
    Superficial frostbite of knee and lower leg
    Header
    Excludes2 1

    Excludes2

    • superficial frostbite of ankle and foot (T33.8-) T33.8
  33. T33.70
    Superficial frostbite of unspecified knee and lower leg +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  34. T33.71
    Superficial frostbite of right knee and lower leg +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  35. T33.72
    Superficial frostbite of left knee and lower leg +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  36. T33.8
    Superficial frostbite of ankle, foot, and toe(s)
    Header
  37. T33.81
    Superficial frostbite of ankle
    Header
  38. T33.811
    Superficial frostbite of right ankle +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  39. T33.812
    Superficial frostbite of left ankle +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  40. T33.819
    Superficial frostbite of unspecified ankle +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  41. T33.82
    Superficial frostbite of foot
    Header
  42. T33.821
    Superficial frostbite of right foot +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  43. T33.822
    Superficial frostbite of left foot +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  44. T33.829
    Superficial frostbite of unspecified foot +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  45. T33.83
    Superficial frostbite of toe(s)
    Header
  46. T33.831
    Superficial frostbite of right toe(s) +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  47. T33.832
    Superficial frostbite of left toe(s) +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  48. T33.839
    Superficial frostbite of unspecified toe(s) +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
  49. T33.9
    Superficial frostbite of other and unspecified sites
    Header
  50. T33.90
    Superficial frostbite of unspecified sites +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Superficial frostbite NOS
  51. T33.99
    Superficial frostbite of other sites +7th: A D S
    Needs 7th characterCC AExempt: 2 of 3 7th characters
    Inclusion terms 2

    Inclusion terms

    • Superficial frostbite of leg NOS
    • Superficial frostbite of trunk NOS

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 T33

Includes

  • frostbite with partial thickness skin loss

Notes that also apply

Block T33-T34 instructions (Excludes2 1): 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 T33 defined here

The appropriate 7th character is to be added to each code from category T33

7th characters for T33
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

  • Frostbite (superficial) → T33.90
  • Frostbite (superficial)ear → T33.01-
  • Frostbite (superficial)nose → T33.02
  • Frostbite (superficial)face → T33.09
  • Frostbite (superficial)head → T33.09
  • Frostbite (superficial)neck → T33.1
  • Frostbite (superficial)thorax → T33.2
  • Frostbite (superficial)abdominal wall → T33.3
  • Frostbite (superficial)pelvis → T33.3
  • Frostbite (superficial)arm → T33.4-
  • Frostbite (superficial)wrist → T33.51-
  • Frostbite (superficial)hand → T33.52-
  • Frostbite (superficial)finger → T33.53-
  • Frostbite (superficial)hip (and thigh) → T33.6-
  • Frostbite (superficial)knee → T33.7-
  • Frostbite (superficial)ankle → T33.81-
  • Frostbite (superficial)foot → T33.82-
  • Frostbite (superficial)toes → T33.83-
  • Frostbite (superficial)leg → T33.99
  • Frostbite (superficial)specified site NEC → T33.99
  • Frostbite (superficial)trunk → T33.99
  • Frostbite (superficial)leglower → T33.7-
  • Frostbite (superficial)limblower → T33.99

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

Hierarchy