DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T36 Poisoning by, adverse effect of and underdosing of systemic antibiotics

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

T36 is not billable. The category heads 198 billable codes in FY2027, grouped under 11 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Billable codes
198
Subdivisions
11
CC / MCC codes
0 / 0
HCC V28 codes
11
New FY2027
0
Index entries
0

Codes in T36

  1. T36.0
    Poisoning by, adverse effect of and underdosing of penicillins
    Header
  2. T36.0X
    Poisoning by, adverse effect of and underdosing of penicillins
    Header
  3. T36.0X1
    Poisoning by penicillins, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by penicillins NOS
  4. T36.0X2
    Poisoning by penicillins, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  5. T36.0X3
    Poisoning by penicillins, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  6. T36.0X4
    Poisoning by penicillins, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  7. T36.0X5
    Adverse effect of penicillins +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  8. T36.0X6
    Underdosing of penicillins +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  9. T36.1
    Poisoning by, adverse effect of and underdosing of cephalosporins and other beta-lactam antibiotics
    Header
  10. T36.1X
    Poisoning by, adverse effect of and underdosing of cephalosporins and other beta-lactam antibiotics
    Header
  11. T36.1X1
    Poisoning by cephalosporins and other beta-lactam antibiotics, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by cephalosporins and other beta-lactam antibiotics NOS
  12. T36.1X2
    Poisoning by cephalosporins and other beta-lactam antibiotics, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  13. T36.1X3
    Poisoning by cephalosporins and other beta-lactam antibiotics, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  14. T36.1X4
    Poisoning by cephalosporins and other beta-lactam antibiotics, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  15. T36.1X5
    Adverse effect of cephalosporins and other beta-lactam antibiotics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  16. T36.1X6
    Underdosing of cephalosporins and other beta-lactam antibiotics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  17. T36.2
    Poisoning by, adverse effect of and underdosing of chloramphenicol group
    Header
  18. T36.2X
    Poisoning by, adverse effect of and underdosing of chloramphenicol group
    Header
  19. T36.2X1
    Poisoning by chloramphenicol group, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by chloramphenicol group NOS
  20. T36.2X2
    Poisoning by chloramphenicol group, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  21. T36.2X3
    Poisoning by chloramphenicol group, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  22. T36.2X4
    Poisoning by chloramphenicol group, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  23. T36.2X5
    Adverse effect of chloramphenicol group +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  24. T36.2X6
    Underdosing of chloramphenicol group +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  25. T36.3
    Poisoning by, adverse effect of and underdosing of macrolides
    Header
  26. T36.3X
    Poisoning by, adverse effect of and underdosing of macrolides
    Header
  27. T36.3X1
    Poisoning by macrolides, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by macrolides NOS
  28. T36.3X2
    Poisoning by macrolides, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  29. T36.3X3
    Poisoning by macrolides, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  30. T36.3X4
    Poisoning by macrolides, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  31. T36.3X5
    Adverse effect of macrolides +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  32. T36.3X6
    Underdosing of macrolides +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  33. T36.4
    Poisoning by, adverse effect of and underdosing of tetracyclines
    Header
  34. T36.4X
    Poisoning by, adverse effect of and underdosing of tetracyclines
    Header
  35. T36.4X1
    Poisoning by tetracyclines, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by tetracyclines NOS
  36. T36.4X2
    Poisoning by tetracyclines, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  37. T36.4X3
    Poisoning by tetracyclines, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  38. T36.4X4
    Poisoning by tetracyclines, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  39. T36.4X5
    Adverse effect of tetracyclines +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  40. T36.4X6
    Underdosing of tetracyclines +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  41. T36.5
    Poisoning by, adverse effect of and underdosing of aminoglycosides
    Header
    Inclusion terms 1

    Inclusion terms

    • Poisoning by, adverse effect of and underdosing of streptomycin
  42. T36.5X
    Poisoning by, adverse effect of and underdosing of aminoglycosides
    Header
  43. T36.5X1
    Poisoning by aminoglycosides, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by aminoglycosides NOS
  44. T36.5X2
    Poisoning by aminoglycosides, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  45. T36.5X3
    Poisoning by aminoglycosides, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  46. T36.5X4
    Poisoning by aminoglycosides, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  47. T36.5X5
    Adverse effect of aminoglycosides +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  48. T36.5X6
    Underdosing of aminoglycosides +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  49. T36.6
    Poisoning by, adverse effect of and underdosing of rifampicins
    Header
  50. T36.6X
    Poisoning by, adverse effect of and underdosing of rifampicins
    Header
  51. T36.6X1
    Poisoning by rifampicins, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by rifampicins NOS
  52. T36.6X2
    Poisoning by rifampicins, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  53. T36.6X3
    Poisoning by rifampicins, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  54. T36.6X4
    Poisoning by rifampicins, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  55. T36.6X5
    Adverse effect of rifampicins +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  56. T36.6X6
    Underdosing of rifampicins +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  57. T36.7
    Poisoning by, adverse effect of and underdosing of antifungal antibiotics, systemically used
    Header
  58. T36.7X
    Poisoning by, adverse effect of and underdosing of antifungal antibiotics, systemically used
    Header
  59. T36.7X1
    Poisoning by antifungal antibiotics, systemically used, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by antifungal antibiotics, systemically used NOS
  60. T36.7X2
    Poisoning by antifungal antibiotics, systemically used, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  61. T36.7X3
    Poisoning by antifungal antibiotics, systemically used, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  62. T36.7X4
    Poisoning by antifungal antibiotics, systemically used, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  63. T36.7X5
    Adverse effect of antifungal antibiotics, systemically used +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  64. T36.7X6
    Underdosing of antifungal antibiotics, systemically used +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  65. T36.8
    Poisoning by, adverse effect of and underdosing of other systemic antibiotics
    Header
  66. T36.8X
    Poisoning by, adverse effect of and underdosing of other systemic antibiotics
    Header
  67. T36.8X1
    Poisoning by other systemic antibiotics, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by other systemic antibiotics NOS
  68. T36.8X2
    Poisoning by other systemic antibiotics, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  69. T36.8X3
    Poisoning by other systemic antibiotics, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  70. T36.8X4
    Poisoning by other systemic antibiotics, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  71. T36.8X5
    Adverse effect of other systemic antibiotics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  72. T36.8X6
    Underdosing of other systemic antibiotics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  73. T36.9
    Poisoning by, adverse effect of and underdosing of unspecified systemic antibiotic
    Header
  74. T36.91
    Poisoning by unspecified systemic antibiotic, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by systemic antibiotic NOS
  75. T36.92
    Poisoning by unspecified systemic antibiotic, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  76. T36.93
    Poisoning by unspecified systemic antibiotic, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  77. T36.94
    Poisoning by unspecified systemic antibiotic, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  78. T36.95
    Adverse effect of unspecified systemic antibiotic +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  79. T36.96
    Underdosing of unspecified systemic antibiotic +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  80. T36.A
    Poisoning by, adverse effect of and underdosing of fluoroquinolone antibiotics
    Header
  81. T36.AX
    Poisoning by, adverse effect of and underdosing of fluoroquinolone antibiotics
    Header
  82. T36.AX1
    Poisoning by fluoroquinolone antibiotics, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by fluoroquinolone antibiotics NOS
  83. T36.AX2
    Poisoning by fluoroquinolone antibiotics, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  84. T36.AX3
    Poisoning by fluoroquinolone antibiotics, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  85. T36.AX4
    Poisoning by fluoroquinolone antibiotics, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  86. T36.AX5
    Adverse effect of fluoroquinolone antibiotics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  87. T36.AX6
    Underdosing of fluoroquinolone antibiotics +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 T36

Excludes1

  • antineoplastic antibiotics (T45.1-) T45.1
  • locally applied antibiotic NEC (T49.0) T49.0
  • topically used antibiotic for ear, nose and throat (T49.6) T49.6
  • topically used antibiotic for eye (T49.5) T49.5

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 T36 defined here

The appropriate 7th character is to be added to each code from category T36

7th characters for T36
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