ICD-10-CM A43 is the diagnosis code for Nocardiosis. This code falls under the section "Other bacterial diseases" 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.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where A43 sits in the ICD-10-CM classification helps ensure proper coding:
No, A43 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
A43 is the ICD-10-CM diagnosis code for "Nocardiosis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
A43 is located in Section A30-A49 — "Other bacterial diseases" within Chapter 1 of the ICD-10-CM Tabular List.
A43 has 4 sub-code(s) that provide more specific detail: A43.0, A43.1, A43.8, A43.9.
Use A43 when the patients documented diagnosis matches "Nocardiosis" 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 Nocardiosis is A43.
No, A43 is non-billable. Use a more specific sub-code for primary diagnosis billing.
A43 is in Chapter 1 of the ICD-10-CM Tabular List.
Yes, A43 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.