ICD-10 A90
Billable / Specific CCDengue fever [classical dengue]
About ICD-10-CM A90
ICD-10-CM code A90 represents Dengue fever [classical dengue]. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A90). The 2026 edition of ICD-10-CM A90 became effective on October 1, 2025.
Coding Tips for A90
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A90 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Type 1 Excludes
Pure excludes, these codes can never be coded together with A90. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- dengue hemorrhagic fever (A91)
Inpatient DRG Impact, CC
code Dengue fever [classical dengue]. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for A90
Local Coverage Determinations (LCDs) from CMS MACs that list A90 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A90.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but A90 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with A90
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert A90 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| A90 | 061 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To A90
Other codes in section A90-A99 (Arthropod-borne viral fevers and viral hemorrhagic fevers).
ICD-10 A90, Billing FAQ
Is ICD-10 code A90 billable? +
Yes, A90 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for A90? +
Type 1 Excludes (never code together with A90): dengue hemorrhagic fever (A91)
Is A90 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does A90 map to? +
Per CMS GEMs, A90 maps to ICD-9 codes: 061. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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