Z11.9 Encounter for screening for infectious and parasitic diseases, unspecified

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

Applies from Z11 Encounter for screening for infectious and parasitic diseases

Applicable to

• Screening is the testing for disease or disease precursors in asymptomatic individuals so that early detection and treatment can be provided for those who test positive for the disease.

Excludes1 (never code together)

• encounter for diagnostic examination-code to sign or symptom

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• V75.9 Screening examination for unspecified infectious disease

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 Z11.9

Back-references to Z11

• Type 2 Excludes: Z00 Encounter for general examination without complaint, suspected or reported diagnosis ("special screening examinations (Z11-Z13)")
• Type 2 Excludes: Z01 Encounter for other special examination without complaint, suspected or reported diagnosis ("screening examinations (Z11-Z13)")

Diagnosis Index entries for Z11.9

• Screening (for) › disease or disorder › infectious
• Screening (for) › parasitic infestation

Nearby codes

• Z11.52 Encounter for screening for COVID-19
• Z11.59 Encounter for screening for other viral diseases
• Z11.6 Encounter for screening for other protozoal diseases and helminthiases
• Z11.7 Encounter for testing for latent tuberculosis infection
• Z11.8 Encounter for screening for other infectious and parasitic diseases
• Z11.9 Encounter for screening for infectious and parasitic diseases, unspecified (this code)