ICD-10-CM B03 is the diagnosis code for Smallpox. This code falls under the section "Viral infections characterized by skin and mucous membrane lesions" within Chapter 1 — Certain infectious and parasitic diseases (A00-B99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. 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 B03 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, B03 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
B03 is the ICD-10-CM diagnosis code for "Smallpox". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
B03 is located in Section B00-B09 — "Viral infections characterized by skin and mucous membrane lesions" within Chapter 1 of the ICD-10-CM Tabular List.
Use B03 when the patients documented diagnosis matches "Smallpox" 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 Smallpox is B03.
Yes, B03 can be used as a primary diagnosis code since it is billable and specific.
B03 is in Chapter 1 of the ICD-10-CM Tabular List.
Yes, B03 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.