K21 is the authoritative medical code for Gastro-esophageal reflux disease. This classification is used in medical billing and clinical recording to specify the clinical criteria for gastro-esophageal reflux disease (ICD-10-CM K21), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Sequencing, inclusion, and exclusion notes published for K21 in the official ICD-10-CM tabular list.
Conditions that can never be reported with this code; the two are mutually exclusive.
Conditions not covered by this code, but which may be reported alongside it when both are present.
No. K21 (Gastro-esophageal reflux disease) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Per Excludes1 instructions, K21 must not be reported with: newborn esophageal reflux (P78.83).
Per Excludes2 instructions, K21 and the following may both be reported when both are present: hiatus hernia (K44.-).
Official ICD-10-CM classifications in the same code family as K21, with their registry titles.
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: