A92.30 West Nile virus infection, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• West Nile fever NOS
• West Nile fever without complications
• West Nile virus NOS

Applies from A92 Other mosquito-borne viral fevers

Excludes1 (never code together)

• Ross River disease (B33.1)

Applies from A92.3 West Nile virus infection

Applicable to

• West Nile fever

MS-DRG index

Defines the logic of DRG(s) 865-866 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 066.40 West Nile Fever, unspecified

Code annotations containing back-references to A92.30

Back-references to A92.3

• Type 2 Excludes: A83 Mosquito-borne viral encephalitis ("West Nile fever (A92.3-)")
• Type 2 Excludes: A83 Mosquito-borne viral encephalitis ("West Nile virus (A92.3-)")

Diagnosis Index entries for A92.30

• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › West › Nile (viral)
• Virus, viral › West Nile (fever)

Nearby codes

• A92 Other mosquito-borne viral fevers
• A92.0 Chikungunya virus disease
• A92.1 O'nyong-nyong fever
• A92.2 Venezuelan equine fever
• A92.3 West Nile virus infection
• A92.30 West Nile virus infection, unspecified (this code)
• A92.31 West Nile virus infection with encephalitis
• A92.32 West Nile virus infection with other neurologic manifestation
• A92.39 West Nile virus infection with other complications
• A92.4 Rift Valley fever
• A92.5 Zika virus disease