ICD-10 Code E87.4 – Mixed disorder of acid-base balance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E87.4 – Mixed disorder of acid-base balance
What it is
This code identifies a documented mixed acid-base disorder, meaning more than one acid-base process is present at the same time. It is used when the pattern cannot be described as a single, isolated imbalance.
Clinical signs
Clinical features vary; refer to documentation. Patients may show findings consistent with combined metabolic and respiratory disturbances, and the record should support that more than one acid-base abnormality is present.
When to use this code
Use E87.4 when the provider documents a mixed acid-base disorder, mixed acidosis, or mixed alkalosis. It may also apply when the chart clearly describes simultaneous opposing acid-base processes. If the documentation is unclear, check documentation before assigning the code.
Do not use for
Do not use this code for a single acid-base imbalance such as isolated acidosis or alkalosis. Do not assign it when the record only shows abnormal blood gas results without a documented mixed disorder.
Coding tip
Code only when the provider explicitly documents a mixed acid-base disorder or the chart clearly supports it.