Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50)

Instructional notes

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

• Section I.C.19.e Adverse Effects, Poisoning, Underdosing and Toxic Effects (page 82), covers T36-T50

  For adverse effects, code the effect first, then T36-T50 with character 5. Sequence poisonings (unknown intent coded accidental) and toxic effects (T51-T65) first; underdosing (character 6) is never first-listed.

Other Chapter 19 topics:

• Application of 7th Characters in Chapter 19 (page 77)
• Coding of Injuries (page 78)
• Coding of Traumatic Fractures (page 79)
• Coding of Burns and Corrosions (page 80)
• Adult and child abuse, neglect and other maltreatment (page 85)
• Complications of care (page 85)

Read Section I.C.19 (page 77)

Codes under T36-T50

T36-T50 can't be used on a claim. Pick a billable code below; grey headings group them.

• T36Poisoning by, adverse effect of and underdosing of systemic antibiotics
• T37Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics
• T38Poisoning by, adverse effect of and underdosing of hormones and their synthetic substitutes and antagonists, not elsewhere classified
• T39Poisoning by, adverse effect of and underdosing of nonopioid analgesics, antipyretics and antirheumatics
• T40Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
• T41Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases
• T42Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
• T43Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified
• T44Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system
• T45Poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified
• T46Poisoning by, adverse effect of and underdosing of agents primarily affecting the cardiovascular system
• T47Poisoning by, adverse effect of and underdosing of agents primarily affecting the gastrointestinal system
• T48Poisoning by, adverse effect of and underdosing of agents primarily acting on smooth and skeletal muscles and the respiratory system
• T49Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs
• T50Poisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances

T36-T50 MS-DRGs

This code does not group to an MS-DRG as a principal diagnosis.

Other codes that refer to T36-T50

Notes on these codes point to T36-T50.

• D46 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D52.1 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D59.0 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D59.2 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D59.39 Use Additional Code: code, if applicable, for adverse effect to identify drug (T36-T50 with fifth or sixth character 5)
• D61.1 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D64.2 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D70.2 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D72.12 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• D84.821 Use Additional Code: code for adverse effect if applicable, to identify adverse effect of drug (T36-T50 with fifth or six character 5)
• D89.3 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E03.2 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E06.4 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E09 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E16.0 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E22.1 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E23.1 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E24.2 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E25.8 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
• E27.3 Use Additional Code: code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.