ICD-10 Code B37.1 – Pulmonary candidiasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B37.1 – Pulmonary candidiasis
What it is
B37.1 identifies candidal infection involving the lungs. Use it when documentation states pulmonary candidiasis, meaning Candida has affected lung tissue rather than only the mouth or esophagus.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include cough, fever, dyspnea, or imaging abnormalities, but these are not specific without provider confirmation of pulmonary Candida infection.
When to use this code
Use B37.1 when the provider explicitly diagnoses pulmonary candidiasis or Candida pneumonia. It is appropriate when the record links Candida infection to the lungs, bronchi, or pulmonary tissue. If the note only says “Candida” without site, check documentation.
Do not use for
Do not use this code for oral thrush, esophageal candidiasis, or nonspecific fungal infection without pulmonary involvement. If the record does not clearly identify the lungs as the infected site, verify the documentation first.
Coding tip
Confirm the anatomic site in the provider note before assigning B37.1.