ICD-10 Code E34.2 – Ectopic hormone secretion, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E34.2 – Ectopic hormone secretion, not elsewhere classified
What it is
E34.2 identifies hormone production from an abnormal source outside the gland that normally makes it. Use it when documentation states ectopic hormone secretion and no more specific ICD-10-CM code applies.
Clinical signs
Clinical features vary; refer to documentation. Findings usually reflect the hormone being produced inappropriately and the resulting endocrine disturbance, which may be supported by imaging, pathology, or specialist assessment.
When to use this code
Use E34.2 when the provider documents ectopic hormone secretion, such as paraneoplastic or other non-endocrine tissue hormone production. It is appropriate when the record does not identify a more specific disorder or site-based code.
Code the documented condition, not the suspected source alone. If the chart only says abnormal hormone levels without confirming ectopic secretion, check documentation before assigning this code.
Do not use for
Do not use this code for routine endocrine gland overactivity, hormone deficiency, or nonspecific laboratory abnormalities. Check documentation if the record describes a tumor or syndrome without stating ectopic hormone secretion.
Coding tip
Assign E34.2 only when the clinician clearly links hormone production to an ectopic source and no more specific diagnosis is documented.