ICD-10-CM · Chapter 21 · Z00-Z99
Z03 Encounter for medical observation for suspected diseases and conditions ruled out
Includes
- 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.
Excludes 1 (cannot be coded 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
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| Z03..6 | Encounter for observation for suspected toxic effect from ingested substance ruled out | Yes |
| Z03..7 | Encounter for suspected maternal and fetal conditions ruled out | No |
| Z03..71 | Encounter for suspected problem with amniotic cavity and membrane ruled out | Yes |
| Z03..72 | Encounter for suspected placental problem ruled out | Yes |
| Z03..73 | Encounter for suspected fetal anomaly ruled out | Yes |
| Z03..74 | Encounter for suspected problem with fetal growth ruled out | Yes |
| Z03..75 | Encounter for suspected cervical shortening ruled out | Yes |
| Z03..79 | Encounter for other suspected maternal and fetal conditions ruled out | Yes |
| Z03..8 | Encounter for observation for other suspected diseases and conditions ruled out | No |
| Z03..81 | Encounter for observation for suspected exposure to biological agents ruled out | No |
| Z03..810 | Encounter for observation for suspected exposure to anthrax ruled out | Yes |
| Z03..818 | Encounter for observation for suspected exposure to other biological agents ruled out | Yes |
| Z03..82 | Encounter for observation for suspected foreign body ruled out | No |
| Z03..821 | Encounter for observation for suspected ingested foreign body ruled out | Yes |
| Z03..822 | Encounter for observation for suspected aspirated (inhaled) foreign body ruled out | Yes |
| Z03..823 | Encounter for observation for suspected inserted (injected) foreign body ruled out | Yes |
| Z03..83 | Encounter for observation for suspected conditions related to home physiologic monitoring device ruled out | Yes |
| Z03..89 | Encounter for observation for other suspected diseases and conditions ruled out | Yes |
Last reviewed: September 2026