ICD-10 Code H05.042 – Tenonitis of left orbit (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H05.042 – Tenonitis of left orbit
What it is
H05.042 identifies inflammation of Tenon’s capsule in the left orbit. Use it when documentation specifically states tenonitis or inflammation limited to the left eye socket tissues.
Clinical signs
Typical findings may include orbital pain, discomfort with eye movement, and localized tenderness or swelling. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents tenonitis affecting the left orbit, including postoperative or inflammatory cases if laterality is clear. It is appropriate when the record distinguishes the condition from other orbital, conjunctival, or extraocular muscle disorders. Check documentation if the note is nonspecific.
Do not use for
Do not use H05.042 for unspecified orbital inflammation or disease of the right eye. Avoid it when the record describes a different eye structure or does not confirm Tenon’s capsule involvement.
Coding tip
Verify both the anatomic site and laterality in the provider note before assigning H05.042.