A43Header code — not billable

Nocardiosis

Chapter
1. Certain infectious and parasitic diseases
Category
A43
Effective date
October 1, 2026

Related codes in category A43

A43.0Pulmonary nocardiosisYesA43.1Cutaneous nocardiosisYesA43.8Other forms of nocardiosisYesA43.9Nocardiosis, unspecifiedYes

Frequently asked questions

What is ICD-10 code A43?

A43 is an ICD-10-CM diagnosis code for Nocardiosis.

Is A43 a billable code?

No. A43 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is A43 in?

A43 falls under Chapter 1: Certain infectious and parasitic diseases.

When did A43 become effective?

A43 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to A43?

A43 belongs to category A43, which includes 4 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.