DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T49 Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs

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

T49 is not billable. The category heads 180 billable codes in FY2027, grouped under 10 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Where it sits

  1. Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
  2. T36-T50 Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
  3. T49 Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs
Billable codes
180
Subdivisions
10
CC / MCC codes
0 / 0
HCC V28 codes
10
New FY2027
0
Index entries
0

Codes in T49

  1. T49.0
    Poisoning by, adverse effect of and underdosing of local antifungal, anti-infective and anti-inflammatory drugs
    Header
  2. T49.0X
    Poisoning by, adverse effect of and underdosing of local antifungal, anti-infective and anti-inflammatory drugs
    Header
  3. T49.0X1
    Poisoning by local antifungal, anti-infective and anti-inflammatory drugs, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by local antifungal, anti-infective and anti-inflammatory drugs NOS
  4. T49.0X2
    Poisoning by local antifungal, anti-infective and anti-inflammatory drugs, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  5. T49.0X3
    Poisoning by local antifungal, anti-infective and anti-inflammatory drugs, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  6. T49.0X4
    Poisoning by local antifungal, anti-infective and anti-inflammatory drugs, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  7. T49.0X5
    Adverse effect of local antifungal, anti-infective and anti-inflammatory drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  8. T49.0X6
    Underdosing of local antifungal, anti-infective and anti-inflammatory drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  9. T49.1
    Poisoning by, adverse effect of and underdosing of antipruritics
    Header
  10. T49.1X
    Poisoning by, adverse effect of and underdosing of antipruritics
    Header
  11. T49.1X1
    Poisoning by antipruritics, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by antipruritics NOS
  12. T49.1X2
    Poisoning by antipruritics, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  13. T49.1X3
    Poisoning by antipruritics, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  14. T49.1X4
    Poisoning by antipruritics, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  15. T49.1X5
    Adverse effect of antipruritics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  16. T49.1X6
    Underdosing of antipruritics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  17. T49.2
    Poisoning by, adverse effect of and underdosing of local astringents and local detergents
    Header
  18. T49.2X
    Poisoning by, adverse effect of and underdosing of local astringents and local detergents
    Header
  19. T49.2X1
    Poisoning by local astringents and local detergents, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by local astringents and local detergents NOS
  20. T49.2X2
    Poisoning by local astringents and local detergents, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  21. T49.2X3
    Poisoning by local astringents and local detergents, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  22. T49.2X4
    Poisoning by local astringents and local detergents, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  23. T49.2X5
    Adverse effect of local astringents and local detergents +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  24. T49.2X6
    Underdosing of local astringents and local detergents +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  25. T49.3
    Poisoning by, adverse effect of and underdosing of emollients, demulcents and protectants
    Header
  26. T49.3X
    Poisoning by, adverse effect of and underdosing of emollients, demulcents and protectants
    Header
  27. T49.3X1
    Poisoning by emollients, demulcents and protectants, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by emollients, demulcents and protectants NOS
  28. T49.3X2
    Poisoning by emollients, demulcents and protectants, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  29. T49.3X3
    Poisoning by emollients, demulcents and protectants, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  30. T49.3X4
    Poisoning by emollients, demulcents and protectants, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  31. T49.3X5
    Adverse effect of emollients, demulcents and protectants +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  32. T49.3X6
    Underdosing of emollients, demulcents and protectants +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  33. T49.4
    Poisoning by, adverse effect of and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations
    Header
  34. T49.4X
    Poisoning by, adverse effect of and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations
    Header
  35. T49.4X1
    Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations NOS
  36. T49.4X2
    Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  37. T49.4X3
    Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  38. T49.4X4
    Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  39. T49.4X5
    Adverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  40. T49.4X6
    Underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  41. T49.5
    Poisoning by, adverse effect of and underdosing of ophthalmological drugs and preparations
    Header
  42. T49.5X
    Poisoning by, adverse effect of and underdosing of ophthalmological drugs and preparations
    Header
  43. T49.5X1
    Poisoning by ophthalmological drugs and preparations, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by ophthalmological drugs and preparations NOS
  44. T49.5X2
    Poisoning by ophthalmological drugs and preparations, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  45. T49.5X3
    Poisoning by ophthalmological drugs and preparations, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  46. T49.5X4
    Poisoning by ophthalmological drugs and preparations, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  47. T49.5X5
    Adverse effect of ophthalmological drugs and preparations +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  48. T49.5X6
    Underdosing of ophthalmological drugs and preparations +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  49. T49.6
    Poisoning by, adverse effect of and underdosing of otorhinolaryngological drugs and preparations
    Header
  50. T49.6X
    Poisoning by, adverse effect of and underdosing of otorhinolaryngological drugs and preparations
    Header
  51. T49.6X1
    Poisoning by otorhinolaryngological drugs and preparations, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by otorhinolaryngological drugs and preparations NOS
  52. T49.6X2
    Poisoning by otorhinolaryngological drugs and preparations, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  53. T49.6X3
    Poisoning by otorhinolaryngological drugs and preparations, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  54. T49.6X4
    Poisoning by otorhinolaryngological drugs and preparations, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  55. T49.6X5
    Adverse effect of otorhinolaryngological drugs and preparations +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  56. T49.6X6
    Underdosing of otorhinolaryngological drugs and preparations +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  57. T49.7
    Poisoning by, adverse effect of and underdosing of dental drugs, topically applied
    Header
  58. T49.7X
    Poisoning by, adverse effect of and underdosing of dental drugs, topically applied
    Header
  59. T49.7X1
    Poisoning by dental drugs, topically applied, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by dental drugs, topically applied NOS
  60. T49.7X2
    Poisoning by dental drugs, topically applied, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  61. T49.7X3
    Poisoning by dental drugs, topically applied, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  62. T49.7X4
    Poisoning by dental drugs, topically applied, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  63. T49.7X5
    Adverse effect of dental drugs, topically applied +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  64. T49.7X6
    Underdosing of dental drugs, topically applied +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  65. T49.8
    Poisoning by, adverse effect of and underdosing of other topical agents
    Header
    Inclusion terms 1

    Inclusion terms

    • Poisoning by, adverse effect of and underdosing of spermicides
  66. T49.8X
    Poisoning by, adverse effect of and underdosing of other topical agents
    Header
  67. T49.8X1
    Poisoning by other topical agents, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by other topical agents NOS
  68. T49.8X2
    Poisoning by other topical agents, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  69. T49.8X3
    Poisoning by other topical agents, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  70. T49.8X4
    Poisoning by other topical agents, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  71. T49.8X5
    Adverse effect of other topical agents +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  72. T49.8X6
    Underdosing of other topical agents +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  73. T49.9
    Poisoning by, adverse effect of and underdosing of unspecified topical agent
    Header
  74. T49.91
    Poisoning by unspecified topical agent, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  75. T49.92
    Poisoning by unspecified topical agent, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  76. T49.93
    Poisoning by unspecified topical agent, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  77. T49.94
    Poisoning by unspecified topical agent, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  78. T49.95
    Adverse effect of unspecified topical agent +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  79. T49.96
    Underdosing of unspecified topical agent +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters

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 T49

Includes

  • poisoning by, adverse effect of and underdosing of glucocorticoids, topically used

Notes that also apply

Block T36-T50 instructions (Notes 1, Includes 4, Excludes1 1, Excludes2 5, Code first 7, Use additional code 4): 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 T49 defined here

The appropriate 7th character is to be added to each code from category T49

7th characters for T49
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.

Hierarchy