Encounter for medical observation for suspected diseases and conditions ruled out
In Persons encountering health services for examinations (Z00-Z13), chapter 21: Factors Influencing Health Status and Contact with Health Services
14 billable codes under Z03: none are a CC or MCC; none map to an HCC.
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Instructional notes
Includes: conditions that are coded here
- 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: not coded here, use a different code
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.
Covers when and how to use Z codes (Z00-Z99) for encounters and supplementary information, including contact, status, history, screening, aftercare, exams, and social determinants of health.
All codes under Z03
Z03 can't be used on a claim. Pick a billable code below; grey headings group them.
- Z03.6Encounter for observation for suspected toxic effect from ingested substance ruled out
- Z03.7Encounter for suspected maternal and fetal conditions ruled out
- Z03.71Encounter for suspected problem with amniotic cavity and membrane ruled out
- Z03.72Encounter for suspected placental problem ruled out
- Z03.73Encounter for suspected fetal anomaly ruled out
- Z03.74Encounter for suspected problem with fetal growth ruled out
- Z03.75Encounter for suspected cervical shortening ruled out
- Z03.79Encounter for other suspected maternal and fetal conditions ruled out
- Z03.8Encounter for observation for other suspected diseases and conditions ruled out
- Z03.81Encounter for observation for suspected exposure to biological agents ruled out
- Z03.810Encounter for observation for suspected exposure to anthrax ruled out
- Z03.818Encounter for observation for suspected exposure to other biological agents ruled out
- Z03.82Encounter for observation for suspected foreign body ruled out
- Z03.821Encounter for observation for suspected ingested foreign body ruled out
- Z03.822Encounter for observation for suspected aspirated (inhaled) foreign body ruled out
- Z03.823Encounter for observation for suspected inserted (injected) foreign body ruled out
- Z03.83Encounter for observation for suspected conditions related to home physiologic monitoring device ruled out
- Z03.89Encounter for observation for other suspected diseases and conditions ruled out
Z03 MS-DRG
As the principal diagnosis, all 14 billable codes under Z03 group to MS-DRG 951 (v44.0).
Other codes that refer to Z03
Notes on these codes point to Z03.
Code history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.