Z03.6 Encounter for observation for suspected toxic effect from ingested substance ruled out

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applicable to

• Encounter for observation for suspected adverse effect from drug
• Encounter for observation for suspected poisoning

Applies from Z03 Encounter for medical observation for suspected diseases and conditions ruled out

Applicable to

• This category is to be used when a person without a diagnosis is suspected of having an abnormal condition, without signs or symptoms, which requires study, but after examination and observation, is ruled out. This category is also for use for administrative and legal observation status.

Excludes1 (never code together)

• contact with and (suspected) exposures hazardous to health (Z77.-)
• encounter for observation and evaluation of newborn for suspected diseases and conditions ruled out (Z05.-)
• person with feared complaint in whom no diagnosis is made (Z71.1)
• signs or symptoms under study- code to signs or symptoms

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• V71.89 Observation and evaluation for other specified suspected conditions (approximate)

Code annotations containing back-references to Z03.6

Back-references to Z03

• Type 1 Excludes: Z01 Encounter for other special examination without complaint, suspected or reported diagnosis ("encounter for examination for suspected conditions, proven not to exist (Z03.-)")
• Type 1 Excludes: Z71.1 Person with feared health complaint in whom no diagnosis is made ("medical observation for suspected diseases and conditions proven not to exist (Z03.-)")

Diagnosis Index entries for Z03.6

• Observation (following) (for) (without need for further medical care) › adverse effect of drug
• Observation (following) (for) (without need for further medical care) › suicide attempt, alleged NEC › self-poisoning
• Observation (following) (for) (without need for further medical care) › suspected, ruled out › drug poisoning or adverse effect
• Observation (following) (for) (without need for further medical care) › suspected, ruled out › suicide attempt, alleged › self-poisoning
• Observation (following) (for) (without need for further medical care) › suspected, ruled out › toxic effects from ingested substance (drug) (poison)
• Observation (following) (for) (without need for further medical care) › toxic effects from ingested substance (drug) (poison)
• Self-poisoning › observation following (alleged) attempt

Nearby codes

• Z03 Encounter for medical observation for suspected diseases and conditions ruled out
• Z03.6 Encounter for observation for suspected toxic effect from ingested substance ruled out (this code)
• Z03.7 Encounter for suspected maternal and fetal conditions ruled out
• Z03.71 Encounter for suspected problem with amniotic cavity and membrane ruled out
• Z03.72 Encounter for suspected placental problem ruled out
• Z03.73 Encounter for suspected fetal anomaly ruled out
• Z03.74 Encounter for suspected problem with fetal growth ruled out