Toxic effect of carbon monoxide from utility gas, undetermined, subsequent encounter

• birth trauma (P10-P15)
• obstetric trauma (O70-O71)

code to identify any retained foreign body, if applicable (Z18.-)

• 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
• 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.

contact with and (suspected) exposure to toxic substances (Z77.-)

• code(s):
• for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70)
• personal history of foreign body fully removed (Z87.821)
• to identify any retained foreign body, if applicable (Z18.-)

When no intent is indicated code to accidental. Undetermined intent is only for use when there is specific documentation in the record that the intent of the toxic effect cannot be determined.

• asphyxiation from carbon monoxide
• toxic effect of carbon monoxide from all sources

The appropriate 7th character is to be added to each code from category T58

• Toxic effect of acetylene
• Toxic effect of gas NOS used for lighting, heating, cooking
• Toxic effect of water gas