ICD-10-CM Book 2026 Edition

Chapters  /  Chapter 21  /  Z00-Z13  /  Z03
Z03 Encounter for medical observation for suspected diseases and conditions ruled out
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 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
Z03.6 Encounter for observation for suspected toxic effect from ingested substance ruled out
Encounter for observation for suspected adverse effect from drug
Encounter for observation for suspected poisoning
Z03.7 Encounter for suspected maternal and fetal conditions ruled out
Encounter for suspected maternal and fetal conditions not found
Excludes1 known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-)
Z03.71 Encounter for suspected problem with amniotic cavity and membrane ruled out
Encounter for suspected oligohydramnios ruled out
Encounter for suspected polyhydramnios ruled out
sex Female
age Maternity: [12-55]
nonPrimary Yes
Z03.72 Encounter for suspected placental problem ruled out
sex Female
age Maternity: [12-55]
nonPrimary Yes
Z03.73 Encounter for suspected fetal anomaly ruled out
sex Female
age Maternity: [12-55]
nonPrimary Yes
Z03.74 Encounter for suspected problem with fetal growth ruled out
sex Female
age Maternity: [12-55]
nonPrimary Yes
Z03.75 Encounter for suspected cervical shortening ruled out
sex Female
age Maternity: [12-55]
nonPrimary Yes
Z03.79 Encounter for other suspected maternal and fetal conditions ruled out
sex Female
age Maternity: [12-55]
nonPrimary Yes
Z03.8 Encounter for observation for other suspected diseases and conditions ruled out
Z03.81 Encounter for observation for suspected exposure to biological agents ruled out
Z03.810 Encounter for observation for suspected exposure to anthrax ruled out
Z03.818 Encounter for observation for suspected exposure to other biological agents ruled out
Z03.82 Encounter for observation for suspected foreign body ruled out
Excludes1 retained foreign body (Z18.-)
retained foreign body in eyelid (H02.81)
residual foreign body in soft tissue (M79.5)
Excludes2 confirmed foreign body ingestion or aspiration including:
foreign body in alimentary tract (T18)
foreign body in ear (T16)
foreign body on external eye (T15)
foreign body in respiratory tract (T17)
Z03.821 Encounter for observation for suspected ingested foreign body ruled out
Z03.822 Encounter for observation for suspected aspirated (inhaled) foreign body ruled out
Z03.823 Encounter for observation for suspected inserted (injected) foreign body ruled out
Encounter for observation for suspected inserted (injected) foreign body in eye ruled out
Encounter for observation for suspected inserted (injected) foreign body in orifice ruled out
Encounter for observation for suspected inserted (injected) foreign body in skin ruled out
Z03.83 Encounter for observation for suspected conditions related to home physiologic monitoring device ruled out
Encounter for observation for apnea alarm without findings
Encounter for observation for bradycardia alarm without findings
Encounter for observation for malfunction of home cardiorespiratory monitor
Encounter for observation for non-specific findings home physiologic monitoring device
Encounter for observation for pulse oximeter alarm without findings
Excludes1 apnea NOS (R06.81)
neonatal bradycardia (P29.12)
newborn apnea (P28.4-)
primary sleep apnea of newborn (P28.3-)
sleep apnea (G47.3-)
Z03.89 Encounter for observation for other suspected diseases and conditions ruled out