2026 ICD-10-CM Diagnosis Code Z03.818Encounter for observation for suspected exposure to other biological agents ruled out

ICD-10-CM Codes›Z00–Z99›Z00-Z13›Z03

ICD-10-CM Z03.818
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z03.818 is a billable ICD-10-CM diagnosis code for encounter for observation for suspected exposure to other biological agents ruled out. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Exposure, encounters, screening or contact with infectious disease.

Code Identity

ICD-10-CM Code
Z03.818
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for observation for suspected exposure to other biological agents ruled out
Short Description
Encntr for obs for susp expsr to oth biolg agents ruled out
Parent Code
Z03.81
Encounter for observation for suspected exposure to biological agents ruled out

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ00-Z13Persons encountering health services for examinations
CategoryZ03Encounter for medical observation for suspected diseases and conditions ruled out
This CodeZ03.818Encounter for observation for suspected exposure to other biological agents ruled out

Present on Admission (POA)Billing

Z03.818 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Encounter(with health service) (for)
      • observation (for) (ruled out)
        • exposure to (suspected)
          • biological agent NEC
    • Encounter(with health service) (for)
      • suspected exposure (to), ruled out
        • biological agents NEC
    • Observation(following) (for) (without need for further medical care)
      • suspected, ruled out
        • exposure (to)
          • biological agent NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC016
Exposure, encounters, screening or contact with infectious disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert Z03.818 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V71.83 Obs/eval exp biol NEC
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z03.818Overview

Is Z03.818 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for observation for suspected exposure to other biological agents ruled out on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is Z03.818 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for encounter for observation for suspected exposure to other biological agents ruled out on inpatient claims.

What is the ICD-9 equivalent of Z03.818?

Under the General Equivalence Mappings, encounter for observation for suspected exposure to other biological agents ruled out converts to ICD-9-CM V71.83 (obs/eval exp biol NEC). The mapping is a direct match.