ICD-10 Code E77.9 – Disorder of glycoprotein metabolism, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E77.9 – Disorder of glycoprotein metabolism, unspecified
What it is
E77.9 identifies a disorder affecting glycoprotein metabolism when the specific type is not documented. Use it for inherited or acquired glycoprotein processing problems that are otherwise unspecified.
Clinical signs
Clinical features vary; refer to documentation. Patients may have findings consistent with abnormal glycoprotein handling, but the record should support a glycoprotein metabolism disorder rather than a broader metabolic condition.
When to use this code
Use E77.9 when the clinician documents a disorder of glycoprotein metabolism and does not name a more specific subtype. It is appropriate when the diagnosis is confirmed or clearly stated in the chart. If the record only suggests a metabolic issue, check documentation before coding.
Do not use for
Do not use this code for other carbohydrate, lipid, or protein metabolism disorders unless glycoprotein metabolism is specifically documented. Do not assign it when a more specific E77 code is available.
Coding tip
Code the most specific glycoprotein disorder documented; if specificity is missing, E77.9 is the default.