Non-Billable / Non-Specific Code
ICD-10-CM K21.0 is the diagnosis code for Gastro-esophageal reflux disease with esophagitis. This code falls under the section "Diseases of esophagus, stomach and duodenum" within Chapter 11 — Diseases of the digestive system (K00-K95). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where K21.0 sits in the ICD-10-CM classification helps ensure proper coding:
No, K21.0 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
K21.0 is the ICD-10-CM diagnosis code for "Gastro-esophageal reflux disease with esophagitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of K21.0 is K21 ("Gastro-esophageal reflux disease"). K21.0 provides a more specific classification within this category.
K21.0 is located in Section K20-K31 — "Diseases of esophagus, stomach and duodenum" within Chapter 11 of the ICD-10-CM Tabular List.
K21.0 has 2 sub-code(s) that provide more specific detail: K21.00, K21.01.
Use K21.0 when the patients documented diagnosis matches "Gastro-esophageal reflux disease with esophagitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Gastro-esophageal reflux disease with esophagitis is K21.0.
No, K21.0 is non-billable. Use a more specific sub-code for primary diagnosis billing.
K21.0 is in Chapter 11 of the ICD-10-CM Tabular List.
Yes, K21.0 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.