All ICD10 Codes

K21

Non-Billable
ChapterK00–K95
Rankcategory
Official Description

Gastro-esophageal reflux disease

Use a more specific code (1 billable, 1 non-billable)
K21.0Gastro-esophageal reflux disease with esophagitishas subcodesK21.9Gastro-esophageal reflux disease without esophagitis
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 11: Diseases of the Digestive System (K00-K95).

CH11 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

K20-K31 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • hiatus hernia (K44.-)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • newborn esophageal reflux (P78.83)

Clinical Hierarchy

BillableHas subcodes
CH11Diseases of the digestive system (K00-K95)
K20-K31Diseases of esophagus, stomach and duodenum (K20-K31)
K21Gastro-esophageal reflux diseaseNot billable
K21.0Gastro-esophageal reflux disease with esophagitisSubcodes
K21.9Gastro-esophageal reflux disease without esophagitisBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to K21:

blockK20-K31
Diseases of esophagus, stomach and duodenum (K20-K31)
View context instructions
chapterCH11
Diseases of the digestive system (K00-K95)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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