A94 — Unspecified arthropod-borne viral fever
Is A94 billable?
Yes, but A94 is an unspecified code. A94 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, A94 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting A94.
A94 at a glance
| Code | A94 |
|---|---|
| Description | Unspecified arthropod-borne viral fever |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does A94 group to?
A94 sits in MDC 18 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 865Viral Illness with MCCmedical
- 866Viral Illness without MCCmedical
As a secondary diagnosis, A94 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is A94 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to A94. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Disease, diseased › arthropod-borne NOS
- Fever › arbovirus, arboviral (inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Fever › hemorrhagicNOS (inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Infection, infected, infective › arbovirus (opportunistic)
- Disease, diseased › viral, virus › arbovirus NOS
- Disease, diseased › viral, virus › arthropod-borne NOS
- Fever › arbovirus, arboviral › hemorrhagic (inanition) (of unknown origin) (persistent) (with chills) (with rigor)
- Infection, infected, infective › virus, viral NOS › arborvirus, arbovirus arthropod-borne (opportunistic)
Inclusion terms
Alternative wording in documentation that is classified to A94.
- Arboviral fever NOS
- Arbovirus infection NOS
Use additional code — inherited from Chapter 1
Report an additional code alongside A94 to fully describe the condition. A94 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of A94, but a patient may have both at the same time. When documentation supports it, A94 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
How long has A94 existed?
A94 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.