Question 1

What is ICD-10 code A03.8?

Accepted Answer

A03.8 is the ICD-10-CM diagnosis code for other shigellosis. This code represents a bacterial infection caused by Shigella bacteria that doesn't fit into the more common types of shigellosis. Shigella causes severe diarrhea and intestinal inflammation, typically spread through contaminated food or water. A03.8 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering intestinal infectious diseases (a00-a09).

A03.8 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.

Use this code only when the specific type of Shigella (A, B, C, or Sonnei) is not documented or identified; if the type is specified, use the more specific subcategory codes A03.0-A03.3.

Question 2

Is A03.8 an HCC code?

Accepted Answer

A03.8 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 3

Is A03.8 billable?

Accepted Answer

Yes. A03.8 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. A03.8 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.

Question 4

Which HCC does A03.8 map to under V28?

Accepted Answer

A03.8 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 5

What RAF reference is published for A03.8?

Accepted Answer

A03.8 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

Question 6

What is the V28 vs V24 difference for A03.8?

Accepted Answer

A03.8 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

Question 7

What documentation supports A03.8?

Accepted Answer

Use this code only when the specific type of Shigella (A, B, C, or Sonnei) is not documented or identified; if the type is specified, use the more specific subcategory codes A03.0-A03.3 Verify documentation includes confirmation of Shigella infection through stool culture or other diagnostic testing before coding, and ensure this is not a case of unspecified infectious diarrhea A03.8 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Question 8

Can A03.8 be a primary diagnosis?

Accepted Answer

Yes. A03.8 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Question 9

Which codes cannot be reported with A03.8?

Accepted Answer

The Excludes1 note that applies to A03.8 lists certain localized infections - see body system-related chapters. An Excludes1 condition is not reported together with A03.8; report one or the other, unless the two conditions are unrelated, which the ICD-10-CM Official Guidelines (Section I.A.12.a) allow. The Excludes2 note lists carrier or suspected carrier of infectious disease (Z22.-); infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-); infectious and parasitic diseases specific to the perinatal period (P35-P39); influenza and other acute respiratory infections (J00-J22); those are separate conditions that may be reported together with A03.8 when both are documented.

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A03.8

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A03.8 ICD-10-CM Code: Other shigellosis

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A03.8

Is A03.8 an HCC code?

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Work A03.8 in HCC Buddy