Underdosing of other antiepileptic and sedative-hypnotic drugs, subsequent encounter
Billable / specificPOA exempt
T42.6X6D is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Inclusion terms
Includes (from T42)
- adverse effect of correct substance properly administered
- poisoning by overdose of substance
- poisoning by wrong substance given or taken in error
- underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed
- Note: Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- Note: The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
- Note: The drug giving rise to the adverse effect should be identified by use of codes from categories T36-T50 with fifth or sixth character 5.
Excludes1
Not coded here — never report together with this code.
Excludes2
Not included here — may be reported together when both conditions exist.
- birth trauma (P10-P15) (from T42)
- obstetric trauma (O70-O71) (from T42)
- abuse and dependence of psychoactive substances (F10-F19) (from T42)
- abuse of non-dependence-producing substances (F55.-) (from T42)
- immunodeficiency due to drugs (D84.821) (from T42)
- drug reaction and poisoning affecting newborn (P00-P96) (from T42)
- pathological drug intoxication (inebriation) (F10-F19) (from T42)
- drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-) (from T42)
Code first
Sequence the underlying condition first.
- , for adverse effects, the nature of the adverse effect, such as: (from T42)
- adverse effect NOS (T88.7) (from T42)
- aspirin gastritis (K29.-) (from T42)
- blood disorders (D56-D76) (from T42)
- contact dermatitis (L23-L25) (from T42)
- dermatitis due to substances taken internally (L27.-) (from T42)
- nephropathy (N14.0-N14.2) (from T42)
Use additional code
Add a code to identify the following, if applicable.
- code to identify any retained foreign body, if applicable (Z18.-) (from T42)
- code(s) to specify: (from T42)
- manifestations of poisoning (from T42)
- underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9) (from T42)
- underdosing of medication regimen (Z91.12-, Z91.13-) (from T42)
7th character
The 7th character values that apply to this code (defined at T42). Use the placeholder "X" for missing positions.
| Character | Meaning |
|---|---|
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
Parent code
- T42.6X6Underdosing of other antiepileptic and sedative-hypnotic drugsNeeds 7th char