A20 ICD-10-CM Code: Plague
A20 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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)
A20
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidancePlague
Plague
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A20 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A20 in this effective period.
Related Child Codes
Includes
Official- infection due to Yersinia pestis
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A20 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A20 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A20 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A20 in this effective period.
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 →
- Code
- A20
- Description
- Plague
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
A20 is the ICD-10-CM diagnosis code for plague. A20 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).
Header codes like A20 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for A20 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Includes
- infection due to Yersinia pestis