A21.7 ICD-10-CM Code: Generalized tularemia
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Certain zoonotic bacterial diseases (A20-A28)
A21.7
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceGeneralized tularemia
Generalized tularemia is a serious infection caused by the bacterium Francisella tularensis that has spread throughout the body, affecting multiple organ systems. This is the most severe form of tularemia and can be life-threatening if not treated promptly with antibiotics.
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
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A21.7 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A21.7 in this effective period.
Related Child Codes
Includes
Official- deer-fly fever
- infection due to Francisella tularensis
- rabbit fever
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A21.7 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A21.7 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A21.7 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A21.7 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 A21.7 an HCC code?
No. A21.7 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
A21.7 is the ICD-10-CM diagnosis code for generalized tularemia. Generalized tularemia is a serious infection caused by the bacterium Francisella tularensis that has spread throughout the body, affecting multiple organ systems. This is the most severe form of tularemia and can be life-threatening if not treated promptly with antibiotics. A21.7 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).
A21.7 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.
Verify that the documentation specifically indicates 'generalized' or 'systemic' tularemia rather than localized forms (such as ulceroglandular, glandular, or oculoglandular) to ensure accurate code selection.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A21.7 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify that the documentation specifically indicates 'generalized' or 'systemic' tularemia rather than localized forms (such as ulceroglandular, glandular, or oculoglandular) to ensure accurate code selection
- •Ensure the source of infection is documented when possible (animal exposure, tick bite, etc.) as this may be relevant for epidemiological tracking and public health reporting requirements