Z03.821 Encounter for observation for suspected ingested foreign body ruled out

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

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

Applies from Z03.82 Encounter for observation for suspected foreign body ruled out

Excludes1 (never code together)

• retained foreign body (Z18.-)
• retained foreign body in eyelid (H02.81)
• residual foreign body in soft tissue (M79.5)

Excludes2 (not included here)

• 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)

MS-DRG index

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

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z03.821

Back-references to Z03.8

• Type 1 Excludes: F63.2 Kleptomania ("shoplifting as the reason for observation for suspected mental disorder (Z03.8)")

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 Z03.821

• Observation (following) (for) (without need for further medical care) › suspected, ruled out › foreign body › ingested

Nearby codes

• 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
• Z03.821 Encounter for observation for suspected ingested foreign body ruled out (this code)
• 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
• Z03.83 Encounter for observation for suspected conditions related to home physiologic monitoring device ruled out
• Z03.89 Encounter for observation for other suspected diseases and conditions ruled out