ICD-10 Code for Reflux

The ICD-10-CM code for reflux is K21.9 — Gastro-esophageal reflux disease without esophagitis. This is the code the Alphabetic Index gives for reflux with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).

Billable

Which reflux code should you use?

The Alphabetic Index lists 14 codes under Reflux. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.

By type

acid	K21.9	Gastro-esophageal reflux disease without esophagitis
esophageal	K21.9	Gastro-esophageal reflux disease without esophagitis
gastroesophageal	K21.9	Gastro-esophageal reflux disease without esophagitis
vesicoureteral	N13.70	Vesicoureteral-reflux, unspecified

Reflux esophageal

with esophagitis	K21.00	Gastro-esophageal reflux disease with esophagitis, without bleeding
newborn	P78.83	Newborn esophageal reflux
with esophagitis › with bleeding	K21.01	Gastro-esophageal reflux disease with esophagitis, with bleeding

Reflux gastroesophageal

with esophagitis	K21.00	Gastro-esophageal reflux disease with esophagitis, without bleeding
with esophagitis › with bleeding	K21.01	Gastro-esophageal reflux disease with esophagitis, with bleeding

Reflux vesicoureteral

congenital	Q62.7	Congenital vesico-uretero-renal reflux
without nephropathy	N13.71	Vesicoureteral-reflux without reflux nephropathy
with › nephropathy	N13.729	Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified
with › pyelonephritis	N11.0	Nonobstructive reflux-associated chronic pyelonephritis
with › nephropathy › with hydroureter	N13.739	Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified
with › nephropathy › bilateral	N13.722	Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral
with › nephropathy › unilateral	N13.721	Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral
with › nephropathy › without hydroureter	N13.729	Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified
with › nephropathy › with hydroureter › bilateral	N13.732	Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral
with › nephropathy › with hydroureter › unilateral	N13.731	Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral
with › nephropathy › without hydroureter › bilateral	N13.722	Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral
with › nephropathy › without hydroureter › unilateral	N13.721	Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral

Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources