ICD-10-CM A77.4 is the diagnosis code for Ehrlichiosis. This code falls under the section "Rickettsioses" within Chapter 1 — Certain infectious and parasitic diseases (A00-B99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as A77.4. They are mutually exclusive:
Understanding where A77.4 sits in the ICD-10-CM classification helps ensure proper coding:
No, A77.4 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
A77.4 is the ICD-10-CM diagnosis code for "Ehrlichiosis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of A77.4 is A77 ("Spotted fever [tick-borne rickettsioses]"). A77.4 provides a more specific classification within this category.
A77.4 is located in Section A75-A79 — "Rickettsioses" within Chapter 1 of the ICD-10-CM Tabular List.
A77.4 has 3 sub-code(s) that provide more specific detail: A77.40, A77.41, A77.49.
Use A77.4 when the patients documented diagnosis matches "Ehrlichiosis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Ehrlichiosis is A77.4.
No, A77.4 is non-billable. Use a more specific sub-code for primary diagnosis billing.
A77.4 is in Chapter 1 of the ICD-10-CM Tabular List.
Type 1 Excludes for A77.4 include: anaplasmosis [A. phagocytophilum] (A79.82); rickettsiosis due to Ehrlichia sennetsu (A79.81).
Yes, A77.4 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.