ICD-10-CM Alphabetic Index · FY 2026 25 Entries
Reflux in the ICD-10-CM Index ICD-10-CM
The main term Reflux carries 25 index entries pointing to 14 ICD-10-CM codes. The default entry is K21.9, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.
✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
25
Index Entries
14
Codes Referenced
K21.9
Default Code
R
Letter
25 of 25 shown
ICD-10-CM
Index Entries Under Reflux 25 entries · 14 codes
Reflux K21.9
acid K21.9
esophageal K21.9
with esophagitis (without bleeding) K21.00
with bleeding K21.01
newborn P78.83
gastroesophageal K21.9
with esophagitis (without bleeding) K21.00
with bleeding K21.01
mitral see Insufficiency, mitral
ureteral see Reflux, vesicoureteral
vesicoureteral (with scarring) N13.70
with
nephropathy N13.729
with hydroureter N13.739
bilateral N13.732
unilateral N13.731
bilateral N13.722
unilateral N13.721
without hydroureter N13.729
bilateral N13.722
unilateral N13.721
pyelonephritis (chronic) N11.0
congenital Q62.7
without nephropathy N13.71
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Related Index Terms
Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.
