ICD-10 code for Arboencephalitis

The ICD-10-CM code for Arboencephalitis is A83.4 (Australian encephalitis).

Within A83 (mosquito-borne viral encephalitis), A83.4 is specifically for Australian encephalitis. Related codes cover Japanese encephalitis (A83.0), Western equine encephalitis (A83.1), Eastern equine encephalitis (A83.2), St Louis encephalitis (A83.3), California encephalitis (A83.5), Rocio virus disease (A83.6), other mosquito-borne viral encephalitis (A83.8) and unspecified (A83.9).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 023 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator, relative weight 5.7444), DRG 024 (Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC, relative weight 3.9708), DRG 097 (Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC, relative weight 3.8226), DRG 098 (Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC, relative weight 2.2706) and DRG 099 (Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC, relative weight 1.5256), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.