K21.00 vs P78.83
K21.00 (Gastro-esophageal reflux disease with esophagitis, without bleeding) compared with P78.83 (Newborn esophageal reflux), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. K21.00 carries an Excludes1 note covering P78.83: “newborn esophageal reflux (P78.83)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| K21.00Gastro-esophageal reflux disease with esophagitis, without bleeding | P78.83Newborn esophageal reflux | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | K00-K95 — Diseases of the Digestive System (K00-K95) | P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96) |
| Definition | Gastro-esophageal reflux disease with esophagitis, without bleeding is a billable ICD-10-CM diagnosis code (K21.00). | Newborn esophageal reflux is a billable ICD-10-CM diagnosis code (P78.83). |
| Includes | Reflux esophagitis | Neonatal esophageal reflux |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources