Category · FY2027
T42 Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
- Header · not billable
- Codes take a 7th character
T42 is not billable. The category heads 162 billable codes in FY2027, grouped under 9 subdivisions. Its codes take a 7th character, so none is complete with fewer than 7 characters.
Where it sits
- Chapter 19 Injury, poisoning and certain other consequences of external causes (S00-T88)
- T36-T50 Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)
- T42 Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
- Billable codes
- 162
- Subdivisions
- 9
- CC / MCC codes
- 0 / 0
- HCC V28 codes
- 9
- New FY2027
- 0
- Index entries
- 0
Codes in T42
- T42.0Poisoning by, adverse effect of and underdosing of hydantoin derivativesHeader
- T42.0XPoisoning by, adverse effect of and underdosing of hydantoin derivativesHeader
- T42.0X1Poisoning by hydantoin derivatives, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by hydantoin derivatives NOS
- T42.0X2Poisoning by hydantoin derivatives, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.0X3Poisoning by hydantoin derivatives, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.0X4Poisoning by hydantoin derivatives, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.0X5Adverse effect of hydantoin derivatives +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.0X6Underdosing of hydantoin derivatives +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.1Poisoning by, adverse effect of and underdosing of iminostilbenesHeader
Inclusion terms 1
Inclusion terms
- Poisoning by, adverse effect of and underdosing of carbamazepine
- T42.1XPoisoning by, adverse effect of and underdosing of iminostilbenesHeader
- T42.1X1Poisoning by iminostilbenes, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by iminostilbenes NOS
- T42.1X2Poisoning by iminostilbenes, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.1X3Poisoning by iminostilbenes, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.1X4Poisoning by iminostilbenes, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.1X5Adverse effect of iminostilbenes +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.1X6Underdosing of iminostilbenes +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.2Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinedionesHeader
- T42.2XPoisoning by, adverse effect of and underdosing of succinimides and oxazolidinedionesHeader
- T42.2X1Poisoning by succinimides and oxazolidinediones, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by succinimides and oxazolidinediones NOS
- T42.2X2Poisoning by succinimides and oxazolidinediones, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.2X3Poisoning by succinimides and oxazolidinediones, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.2X4Poisoning by succinimides and oxazolidinediones, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.2X5Adverse effect of succinimides and oxazolidinediones +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.2X6Underdosing of succinimides and oxazolidinediones +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.3Poisoning by, adverse effect of and underdosing of barbituratesHeader
Excludes1 1
Excludes1
- poisoning by, adverse effect of and underdosing of thiobarbiturates (T41.1-) T41.1
- T42.3XPoisoning by, adverse effect of and underdosing of barbituratesHeader
- T42.3X1Poisoning by barbiturates, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by barbiturates NOS
- T42.3X2Poisoning by barbiturates, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.3X3Poisoning by barbiturates, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.3X4Poisoning by barbiturates, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.3X5Adverse effect of barbiturates +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.3X6Underdosing of barbiturates +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.4Poisoning by, adverse effect of and underdosing of benzodiazepinesHeader
- T42.4XPoisoning by, adverse effect of and underdosing of benzodiazepinesHeader
- T42.4X1Poisoning by benzodiazepines, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by benzodiazepines NOS
- T42.4X2Poisoning by benzodiazepines, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.4X3Poisoning by benzodiazepines, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.4X4Poisoning by benzodiazepines, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.4X5Adverse effect of benzodiazepines +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.4X6Underdosing of benzodiazepines +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.5Poisoning by, adverse effect of and underdosing of mixed antiepilepticsHeader
- T42.5XPoisoning by, adverse effect of and underdosing of antiepilepticsHeader
- T42.5X1Poisoning by mixed antiepileptics, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by mixed antiepileptics NOS
- T42.5X2Poisoning by mixed antiepileptics, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.5X3Poisoning by mixed antiepileptics, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.5X4Poisoning by mixed antiepileptics, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.5X5Adverse effect of mixed antiepileptics +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.5X6Underdosing of mixed antiepileptics +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.6Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugsHeader
Inclusion terms 2, Excludes1 1
Inclusion terms
- Poisoning by, adverse effect of and underdosing of methaqualone
- Poisoning by, adverse effect of and underdosing of valproic acid
Excludes1
- poisoning by, adverse effect of and underdosing of carbamazepine (T42.1-) T42.1
- T42.6XPoisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugsHeader
- T42.6X1Poisoning by other antiepileptic and sedative-hypnotic drugs, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by other antiepileptic and sedative-hypnotic drugs NOS
- T42.6X2Poisoning by other antiepileptic and sedative-hypnotic drugs, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.6X3Poisoning by other antiepileptic and sedative-hypnotic drugs, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.6X4Poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.6X5Adverse effect of other antiepileptic and sedative-hypnotic drugs +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.6X6Underdosing of other antiepileptic and sedative-hypnotic drugs +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.7Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugsHeader
- T42.71Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by antiepileptic and sedative-hypnotic drugs NOS
- T42.72Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.73Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.74Poisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.75Adverse effect of unspecified antiepileptic and sedative-hypnotic drugs +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.76Underdosing of unspecified antiepileptic and sedative-hypnotic drugs +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.8Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressantsHeader
Inclusion terms 1
Inclusion terms
- Poisoning by, adverse effect of and underdosing of amantadine
- T42.8XPoisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressantsHeader
- T42.8X1Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional) +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
Inclusion terms 1
Inclusion terms
- Poisoning by antiparkinsonism drugs and other central muscle-tone depressants NOS
- T42.8X2Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm +7th: A D SNeeds 7th character155 (some 7th characters)Exempt: 2 of 3 7th characters
- T42.8X3Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.8X4Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.8X5Adverse effect of antiparkinsonism drugs and other central muscle-tone depressants +7th: A D SNeeds 7th characterExempt: 2 of 3 7th characters
- T42.8X6Underdosing of antiparkinsonism drugs and other central muscle-tone depressants +7th: A D SNeeds 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 T42
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 T42 defined here
The appropriate 7th character is to be added to each code from category T42
| 7th | Meaning (NCHS) |
|---|---|
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
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.