2024 ICD-10-CM Diagnosis Code A77.4

by

Ehrlichiosis

  • A77.4 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2024 edition of ICD-10-CM A77.4 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of A77.4 – other international versions of ICD-10 A77.4 may differ.

Type 1 Excludes

  • anaplasmosis [A. phagocytophilum] (A79.82)
  • rickettsiosis due to Ehrlichia sennetsu (A79.81)

The following code(s) above A77.4 contain annotation back-references

 that may be applicable to A77.4:

  • A00-B99  Certain infectious and parasitic diseases

Clinical Information

  • A tick-borne disease characterized by fever; headache; myalgias; anorexia; and occasionally rash. It is caused by several bacterial species and can produce disease in dogs; cattle; sheep; goats; horses; and humans. The primary species causing human disease are ehrlichia chaffeensis; anaplasma phagocytophilum; and ehrlichia ewingii.
  • Febrile illness caused by infection with ehrlichia species.

Code History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change