What is ICD-10 code A93.2?

A93.2 is the ICD-10-CM diagnosis code for Colorado tick fever. It belongs to the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99). A93.2 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. A93.2 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. A93.2 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. A93.2 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does A93.2 map to under V28?

A93.2 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for A93.2?

A93.2 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for A93.2?

A93.2 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

2026 ICD-10-CM A93.2: Colorado tick fever

A93.2 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools

ICD-10-CM Code View

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Code lookupA93.2

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99)

A93.2

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Colorado tick fever

Colorado tick fever is a viral infection transmitted through the bite of infected ticks, causing symptoms like fever, headache, muscle aches, and sometimes a rash. It is most commonly found in the western United States during spring and summer months.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

A93Other arthropod-borne viral fevers, not elsewhere classified A93.2Colorado tick fever

Inclusion Terms

Official

No inclusion terms are included in this display for A93.2. Check the code and parent instructions in the Code Book.

Excludes 2

Official

carrier or suspected carrier of infectious disease (Z22.-)Inherited from A00-B99
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)Inherited from A00-B99
infectious and parasitic diseases specific to the perinatal period (P35-P39)Inherited from A00-B99
influenza and other acute respiratory infections (J00-J22)Inherited from A00-B99

Related Codes

Official

A93.0Oropouche virus disease A93.1Sandfly fever A93.8Other specified arthropod-borne viral fevers

Includes

Official

diseases generally recognized as communicable or transmissibleInherited from A00-B99

Excludes 1

Official

certain localized infections - see body system-related chaptersInherited from A00-B99

Code First

Official

No Code First sequencing instructions are included in this display for A93.2. Check the code and parent instructions in the Code Book.

Use Additional

Official

code to identify resistance to antimicrobial drugs (Z16.-)Inherited from A00-B99

Code Also

Official

No Code Also instructions are included in this display for A93.2. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Ensure the diagnosis is confirmed by clinical presentation and/or laboratory testing before coding, as tick-borne illnesses require specific documentation

Document the season and geographic location when available, as this supports medical necessity and helps with epidemiological tracking

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is A93.2 an HCC code?

No. A93.2 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.

Code: A93.2
Description: Colorado tick fever
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

Coder workflow notes

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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

A93.2 is the ICD-10-CM diagnosis code for colorado tick fever. Colorado tick fever is a viral infection transmitted through the bite of infected ticks, causing symptoms like fever, headache, muscle aches, and sometimes a rash. It is most commonly found in the western United States during spring and summer months. A93.2 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering arthropod-borne viral fevers and viral hemorrhagic fevers (a90-a99).

A93.2 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

Ensure the diagnosis is confirmed by clinical presentation and/or laboratory testing before coding, as tick-borne illnesses require specific documentation.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for A93.2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Ensure the diagnosis is confirmed by clinical presentation and/or laboratory testing before coding, as tick-borne illnesses require specific documentation
•Document the season and geographic location when available, as this supports medical necessity and helps with epidemiological tracking