Summary & Overview
Typhus fever: ICD-10-CM Diagnosis Code Group Overview
International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) codes under the group ICD-10-CM A75 cover typhus fevers caused by rickettsial organisms, characterized by systemic infection often presenting with fever, rash, and vascular involvement. Accurate ICD-10-CM coding for this group is important for correct reimbursement, clinical documentation, and public health surveillance.
Typhus fever Overview
The diagnoses in this group represent systemic infectious diseases caused by rickettsial organisms classified as typhus fevers, affecting multiple organ systems with common manifestations including fever, rash, and vascular inflammation. These conditions target the infectious disease processes and can involve dermatologic, cardiovascular, and neurologic complications. Accurate coding ensures correct grouping within infectious disease categories and supports appropriate billing and epidemiologic tracking. Proper specificity affects reimbursement and public health reporting.
Typical Clinical Scenarios
- An adult patient presents to the emergency department with acute high fever, severe headache, diffuse maculopapular rash, myalgias, and a recent history of sleeping in an area with heavy flea exposure or recent travel to an endemic region; laboratory testing supports an acute rickettsial infection and treatment is initiated for an acute febrile illness. A diagnosis in this group is assigned for an acute typhus fever confirmed or strongly suspected as the cause of the current systemic febrile illness. Typical codes:
A750,A751 - An elderly patient with subacute onset of fever, confusion, and hypotension is admitted from a skilled nursing facility; the clinical team documents typhus as the underlying infectious process contributing to delirium and hemodynamic instability, requiring inpatient management and monitoring for complications. A code from this group is used to identify the infectious etiology as a principal or secondary diagnosis affecting the current hospitalization. Typical codes:
A752,A759 - A pediatric outpatient follows up after recovery from an acute febrile illness attributed to murine typhus; the visit documents residual dermatologic sequelae and the need to verify clearance of infection and public health notification. A post-infectious or follow-up encounter related to a previously treated typhus infection is coded from this group to capture the recent rickettsial disease in the patient’s problem list. Typical codes:
A753,A759