ICD-10-CM 2027
ICD-10 code for viral encephalitis screening
From the official ICD-10-CM alphabetic index entry “Screening (for) › viral encephalitis (mosquito- or tick-borne)”. Page updated September 29, 2026.
About coding viral encephalitis screening
The ICD-10-CM code for viral encephalitis screening is Z11.59 (Encounter for screening for other viral diseases).
Within Z11.5, choose Z11.59 (other viral diseases) only when documentation doesn't support a more specific option: human papillomavirus (HPV) (Z11.51) and COVID-19 (Z11.52).
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.
Common questions about viral encephalitis screening ICD-10 codes
What is the ICD-10 code for viral encephalitis screening?
- Z11.59 — Encounter for screening for other viral diseases.
Is Z11.59 billable?
- Yes. Z11.59 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z11.59 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z11.59 a CC or MCC?
- No. Z11.59 is neither a CC nor an MCC under MS-DRG v44.0.