A22.8 ICD-10-CM Code: Other forms of anthrax
HCC Buddy Code Card
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Certain zoonotic bacterial diseases (A20-A28)
A22.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther forms of anthrax
This code represents anthrax infections that don't fit into the more common categories like skin, inhalation, or gastrointestinal anthrax. It includes rare presentations of this serious bacterial infection caused by Bacillus anthracis.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Anthrax meningitis
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A22.8 in this effective period.
Related Child Codes
Includes
Official- infection due to Bacillus anthracis
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A22.8 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A22.8 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A22.8 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A22.8 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A22.8 an HCC code?
No. A22.8 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
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
A22.8 is the ICD-10-CM diagnosis code for other forms of anthrax. This code represents anthrax infections that don't fit into the more common categories like skin, inhalation, or gastrointestinal anthrax. It includes rare presentations of this serious bacterial infection caused by Bacillus anthracis. A22.8 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering certain zoonotic bacterial diseases (a20-a28).
A22.8 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code only when the anthrax presentation is not cutaneous (A22.0), inhalation (A22.1), gastrointestinal (A22.2), or sepsis (A22.7); document the specific type of anthrax infection in the medical record.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A22.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the anthrax presentation is not cutaneous (A22.0), inhalation (A22.1), gastrointestinal (A22.2), or sepsis (A22.7); document the specific type of anthrax infection in the medical record
- •This is a reportable disease in most jurisdictions; verify local public health reporting requirements and consider adding a secondary code for any complications or systemic manifestations