Question 1

What is ICD-10 code A70?

Accepted Answer

A70 is the ICD-10-CM diagnosis code for chlamydia psittaci infections. This is a bacterial infection caused by Chlamydia psittaci, typically transmitted from infected birds to humans through inhalation of contaminated dust or respiratory secretions. The infection commonly causes pneumonia and flu-like symptoms in affected individuals. A70 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other diseases caused by chlamydiae (a70-a74).

A70 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.

Verify the specific site of infection (respiratory tract, systemic, etc.) as A70 is the parent code; additional specificity codes may be needed depending on documentation.

Question 2

Is A70 an HCC code?

Accepted Answer

A70 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 3

Is A70 billable?

Accepted Answer

Yes. A70 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. A70 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 A70 map to under V28?

Accepted Answer

A70 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 5

What RAF reference is published for A70?

Accepted Answer

A70 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 A70?

Accepted Answer

A70 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 A70?

Accepted Answer

Verify the specific site of infection (respiratory tract, systemic, etc.) as A70 is the parent code; additional specificity codes may be needed depending on documentation Document the source of exposure (bird contact, occupational exposure) as this helps establish the diagnosis and may be relevant for public health reporting A70 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.

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A70

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A70 ICD-10-CM Code: Chlamydia psittaci infections

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A70

Is A70 an HCC code?

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What This Code Means

Coding Tips

Code Hierarchy

Work A70 in HCC Buddy