DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

T37 Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics

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

T37 is not billable. The category heads 144 billable codes in FY2027, grouped under 8 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.

Billable codes
144
Subdivisions
8
CC / MCC codes
0 / 0
HCC V28 codes
8
New FY2027
0
Index entries
0

Codes in T37

  1. T37.0
    Poisoning by, adverse effect of and underdosing of sulfonamides
    Header
  2. T37.0X
    Poisoning by, adverse effect of and underdosing of sulfonamides
    Header
  3. T37.0X1
    Poisoning by sulfonamides, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by sulfonamides NOS
  4. T37.0X2
    Poisoning by sulfonamides, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  5. T37.0X3
    Poisoning by sulfonamides, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  6. T37.0X4
    Poisoning by sulfonamides, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  7. T37.0X5
    Adverse effect of sulfonamides +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  8. T37.0X6
    Underdosing of sulfonamides +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  9. T37.1
    Poisoning by, adverse effect of and underdosing of antimycobacterial drugs
    Header
    Excludes1 2

    Excludes1

    • rifampicins (T36.6-) T36.6
    • streptomycin (T36.5-) T36.5
  10. T37.1X
    Poisoning by, adverse effect of and underdosing of antimycobacterial drugs
    Header
  11. T37.1X1
    Poisoning by antimycobacterial drugs, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by antimycobacterial drugs NOS
  12. T37.1X2
    Poisoning by antimycobacterial drugs, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  13. T37.1X3
    Poisoning by antimycobacterial drugs, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  14. T37.1X4
    Poisoning by antimycobacterial drugs, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  15. T37.1X5
    Adverse effect of antimycobacterial drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  16. T37.1X6
    Underdosing of antimycobacterial drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  17. T37.2
    Poisoning by, adverse effect of and underdosing of antimalarials and drugs acting on other blood protozoa
    Header
    Excludes1 1

    Excludes1

    • hydroxyquinoline derivatives (T37.8-) T37.8
  18. T37.2X
    Poisoning by, adverse effect of and underdosing of antimalarials and drugs acting on other blood protozoa
    Header
  19. T37.2X1
    Poisoning by antimalarials and drugs acting on other blood protozoa, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by antimalarials and drugs acting on other blood protozoa NOS
  20. T37.2X2
    Poisoning by antimalarials and drugs acting on other blood protozoa, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  21. T37.2X3
    Poisoning by antimalarials and drugs acting on other blood protozoa, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  22. T37.2X4
    Poisoning by antimalarials and drugs acting on other blood protozoa, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  23. T37.2X5
    Adverse effect of antimalarials and drugs acting on other blood protozoa +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  24. T37.2X6
    Underdosing of antimalarials and drugs acting on other blood protozoa +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  25. T37.3
    Poisoning by, adverse effect of and underdosing of other antiprotozoal drugs
    Header
  26. T37.3X
    Poisoning by, adverse effect of and underdosing of other antiprotozoal drugs
    Header
  27. T37.3X1
    Poisoning by other antiprotozoal drugs, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by other antiprotozoal drugs NOS
  28. T37.3X2
    Poisoning by other antiprotozoal drugs, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  29. T37.3X3
    Poisoning by other antiprotozoal drugs, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  30. T37.3X4
    Poisoning by other antiprotozoal drugs, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  31. T37.3X5
    Adverse effect of other antiprotozoal drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  32. T37.3X6
    Underdosing of other antiprotozoal drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  33. T37.4
    Poisoning by, adverse effect of and underdosing of anthelminthics
    Header
  34. T37.4X
    Poisoning by, adverse effect of and underdosing of anthelminthics
    Header
  35. T37.4X1
    Poisoning by anthelminthics, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by anthelminthics NOS
  36. T37.4X2
    Poisoning by anthelminthics, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  37. T37.4X3
    Poisoning by anthelminthics, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  38. T37.4X4
    Poisoning by anthelminthics, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  39. T37.4X5
    Adverse effect of anthelminthics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  40. T37.4X6
    Underdosing of anthelminthics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  41. T37.5
    Poisoning by, adverse effect of and underdosing of antiviral drugs
    Header
    Excludes1 2

    Excludes1

    • amantadine (T42.8-) T42.8
    • cytarabine (T45.1-) T45.1
  42. T37.5X
    Poisoning by, adverse effect of and underdosing of antiviral drugs
    Header
  43. T37.5X1
    Poisoning by antiviral drugs, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by antiviral drugs NOS
  44. T37.5X2
    Poisoning by antiviral drugs, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  45. T37.5X3
    Poisoning by antiviral drugs, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  46. T37.5X4
    Poisoning by antiviral drugs, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  47. T37.5X5
    Adverse effect of antiviral drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  48. T37.5X6
    Underdosing of antiviral drugs +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  49. T37.8
    Poisoning by, adverse effect of and underdosing of other specified systemic anti-infectives and antiparasitics
    Header
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Poisoning by, adverse effect of and underdosing of hydroxyquinoline derivatives

    Excludes1

    • antimalarial drugs (T37.2-) T37.2
  50. T37.8X
    Poisoning by, adverse effect of and underdosing of other specified systemic anti-infectives and antiparasitics
    Header
  51. T37.8X1
    Poisoning by other specified systemic anti-infectives and antiparasitics, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by other specified systemic anti-infectives and antiparasitics NOS
  52. T37.8X2
    Poisoning by other specified systemic anti-infectives and antiparasitics, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  53. T37.8X3
    Poisoning by other specified systemic anti-infectives and antiparasitics, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  54. T37.8X4
    Poisoning by other specified systemic anti-infectives and antiparasitics, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  55. T37.8X5
    Adverse effect of other specified systemic anti-infectives and antiparasitics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  56. T37.8X6
    Underdosing of other specified systemic anti-infectives and antiparasitics +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  57. T37.9
    Poisoning by, adverse effect of and underdosing of unspecified systemic anti-infective and antiparasitics
    Header
  58. T37.91
    Poisoning by unspecified systemic anti-infective and antiparasitics, accidental (unintentional) +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
    Inclusion terms 1

    Inclusion terms

    • Poisoning by, adverse effect of and underdosing of systemic anti-infective and antiparasitics NOS
  59. T37.92
    Poisoning by unspecified systemic anti-infective and antiparasitics, intentional self-harm +7th: A D S
    Needs 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
  60. T37.93
    Poisoning by unspecified systemic anti-infective and antiparasitics, assault +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  61. T37.94
    Poisoning by unspecified systemic anti-infective and antiparasitics, undetermined +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  62. T37.95
    Adverse effect of unspecified systemic anti-infective and antiparasitic +7th: A D S
    Needs 7th characterExempt: 2 of 3 7th characters
  63. T37.96
    Underdosing of unspecified systemic anti-infectives and antiparasitics +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 T37

Excludes1

  • anti-infectives topically used for ear, nose and throat (T49.6-) T49.6
  • anti-infectives topically used for eye (T49.5-) T49.5
  • locally applied anti-infectives NEC (T49.0-) T49.0

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 T37 defined here

The appropriate 7th character is to be added to each code from category T37

7th characters for T37
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