A75.0 ICD-10-CM Code: Epidemic louse-borne typhus fever due to Rickettsia prowazekii
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Rickettsioses (A75-A79)
A75.0
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceEpidemic louse-borne typhus fever due to Rickettsia prowazekii
This is a serious infectious disease spread by body lice that causes high fever, headache, and rash. It is caused by a specific bacterium called Rickettsia prowazekii and typically occurs in crowded, unsanitary conditions.
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- Classical typhus (fever)
- Epidemic (louse-borne) typhus
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A75.0 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A75.0 in this effective period.
Excludes 1
Official- rickettsiosis due to Ehrlichia sennetsu (A79.81)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A75.0 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A75.0 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A75.0 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 A75.0 an HCC code?
No. A75.0 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A75.0 is the ICD-10-CM diagnosis code for epidemic louse-borne typhus fever due to rickettsia prowazekii. This is a serious infectious disease spread by body lice that causes high fever, headache, and rash. It is caused by a specific bacterium called Rickettsia prowazekii and typically occurs in crowded, unsanitary conditions. A75.0 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering rickettsioses (a75-a79).
A75.0 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.
This code is specific to epidemic (louse-borne) typhus and should not be confused with endemic typhus (A75.1) or other rickettsial infections; verify the vector and type of typhus in documentation.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A75.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is specific to epidemic (louse-borne) typhus and should not be confused with endemic typhus (A75.1) or other rickettsial infections; verify the vector and type of typhus in documentation
- •Rickettsia prowazekii is the causative organism for epidemic typhus, so documentation should confirm louse transmission rather than flea or tick vectors before assigning this code