2026 ICD-10-CM Diagnosis Code Z11.8Encounter for screening for other infectious and parasitic diseases
Z11.8 is a billable ICD-10-CM diagnosis code for encounter for screening for other infectious and parasitic diseases. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. Coders also document this condition as Chlamydia antigen not detected by enzyme-linked immunosorbent assay. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Exposure, encounters, screening or contact with infectious disease.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z11.8.
Present on Admission (POA)Billing
Z11.8 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chlamydia antigen not detected by enzyme-linked immunosorbent assay
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Encounter for screening for chlamydia
- Encounter for screening for rickettsial
- Encounter for screening for spirochetal
- Encounter for screening for mycoses
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Screening (for) - Z13.9
- chlamydial diseases - Z11.8
- chlamydial - Z11.8
- rickettsial - Z11.8
- spirochetal - Z11.8
- leptospirosis - Z11.8
- mycoses - Z11.8
- parasitic infestation - Z11.9
- specified NEC - Z11.8
- trachoma - Z11.8
- yaws - Z11.8
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Screening(for)
- chlamydial diseases
- Screening(for)
- disease or disorder
- chlamydial
- Screening(for)
- disease or disorder
- rickettsial
- Screening(for)
- disease or disorder
- spirochetal
- Screening(for)
- infection
- mycotic
- Screening(for)
- infection
- parasitic
- Screening(for)
- leptospirosis
- Screening(for)
- mycoses
- Screening(for)
- parasitic infestation
- specified NEC
- Screening(for)
- trachoma
- Screening(for)
- yaws
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Health Screening
Screenings are tests that look for diseases before you have symptoms. Screening tests can find diseases early, when they're easier to treat. You can get some screenings in your doctor's office. Others need special equipment, so you may need to go to a different office or clinic.
Read the full article at MedlinePlus
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Convert Z11.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z11.8Overview
Is Z11.8 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report encounter for screening for other infectious and parasitic diseases on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Can Z11.8 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because encounter for screening for other infectious and parasitic diseases describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z11.8 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 screening for other infectious and parasitic diseases on inpatient claims.
What is the ICD-9 equivalent of Z11.8?
Under the General Equivalence Mappings, encounter for screening for other infectious and parasitic diseases converts to ICD-9-CM V73.88 (scrn oth spcf chlmyd dis), V73.98 (scrn unspcf chlmyd dis), and V74.6 (screening for yaws). The mapping is approximate, so confirm the match fits the documentation.
