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

Z03.6 is the ICD-10-CM diagnosis code for encounter for observation for suspected toxic effect from ingested substance ruled out. It belongs to category Z03 (encounter for medical observation for suspected diseases and conditions ruled out), block Z00-Z13 (persons encountering health services for examinations) and chapter 21 (factors influencing health status and contact with health services). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Z03 (encounter for medical observation for suspected diseases and conditions ruled out), Z03.6 is specifically for encounter for observation for suspected toxic effect from ingested substance ruled out. Related codes cover suspected maternal and fetal conditions ruled out (Z03.7) and observation for other suspected diseases and conditions ruled out (Z03.8).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as V71.89 (observation and evaluation for other specified suspected conditions).