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    OpenPayerBilling CodesRickettsiosesICD-10-CM a77-spotted-fever-tick-borne-rickettsioses
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    ICD-10-CM Code For Spotted Fever Tick-Borne Rickettsioses: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A77 includes rickettsial infections transmitted by ticks, such as spotted fever and related tick-borne rickettsioses, covering systemic febrile illnesses often with rash and potential organ involvement. These ICD-10-CM diagnosis codes are used to document clinical presentations of tick-borne rickettsial infection, capturing severity, organ system involvement, and complications relevant to the disease. Accurate coding within the ICD-10-CM A77 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM A77: Spotted Fever [Tick-Borne Rickettsioses] Overview

    This group represents infections caused by Rickettsia species transmitted by ticks, commonly known as spotted fever and related tick-borne rickettsioses. These conditions primarily affect the vascular endothelium and can involve systemic symptoms such as fever, rash, and potential organ dysfunction. Accurate coding supports correct clinical documentation and reimbursement by reflecting disease severity and complications.

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    When to Use

    Use a code from this group when a patient has a confirmed or clinically diagnosed tick-borne rickettsial infection such as spotted fever. Codes should be assigned to reflect disease severity, presence of rash, or any organ-specific complications documented in the clinical record.

    ICD-10-CM Codes

    9 rows

    ICD-10-CM CodeDescription
    A77.0Spotted fever due to Rickettsia rickettsii
    A77.1Spotted fever due to Rickettsia conorii
    A77.2Spotted fever due to Rickettsia siberica
    A77.3Spotted fever due to Rickettsia australis
    A77.40Ehrlichiosis, unspecified
    A77.41Ehrlichiosis chaffeensis [E. chaffeensis]
    A77.49Other ehrlichiosis
    A77.8Other spotted fevers
    A77.9Spotted fever, unspecified

    DRG Codes

    3 rows

    DRG CodeDescription
    867Other Infectious and Parasitic Diseases Diagnoses with MCC
    868Other Infectious and Parasitic Diseases Diagnoses with CC
    869Other Infectious and Parasitic Diseases Diagnoses without CC/MCC

    Typical Clinical Scenarios

    • A middle-aged hiker presents to the emergency department with acute high fever, severe headache, myalgias, and a maculopapular rash that began several days after a known tick bite. The clinician documents an acute tick-borne spotted fever and orders serology and empiric doxycycline; a diagnosis from this group is assigned for an acute rickettsial infection. Typical codes: A77.0, A77.8
    • An elderly patient in follow-up clinic has persistent fatigue, intermittent low-grade fevers, and a resolving rash three weeks after treatment for an initial tick-associated febrile illness; the provider documents convalescent-phase or post-infectious manifestations related to spotted fever and monitors serologic titers. A code from this group is used to capture the recent rickettsial infection and ongoing recovery care. Typical codes: A77.1, A77.9
    • A young child is hospitalized with severe febrile illness complicated by neurologic signs (confusion) and possible organ dysfunction after a suspected tick exposure; the team documents a complicated or systemic rickettsial spotted fever requiring inpatient management and targeted therapy. A code indicating spotted fever with complications or unspecified serious rickettsial disease is assigned to reflect the severity. Typical codes: A77.2, A77.41

    Related Codes

    A75-TYPHUS-FEVER

    ICD-10-CM Code For Typhus Fever: Group Overview

    A78-Q-FEVER

    ICD-10-CM Code For Q Fever: Group Overview

    A79-OTHER-RICKETTSIOSES

    ICD-10-CM Code For Other Rickettsioses: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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