ICD-10-CM · Chapter 11 · K00-K95
K21 Gastro-esophageal reflux disease
Excludes 1 (cannot be coded together)
- newborn esophageal reflux (P78.83)
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| K21..0 | Gastro-esophageal reflux disease with esophagitis | No |
| K21..00 | Gastro-esophageal reflux disease with esophagitis, without bleeding | Yes |
| K21..01 | Gastro-esophageal reflux disease with esophagitis, with bleeding | Yes |
| K21..9 | Gastro-esophageal reflux disease without esophagitis | Yes |
Plain-language terms for this code
The following entries in the US Medical Glossary correspond to ICD-10-CM category K21:
- Acid Reflux (GERD) — Reflujo ácido
- GERD (Gastroesophageal Reflux Disease) — ERGE (Enfermedad por reflujo gastroesofágico)
Last reviewed: September 2026