K21.00 Gastro-esophageal reflux disease with esophagitis, without bleeding
The ICD-10-CM code for Gastro-esophageal reflux disease with esophagitis, without bleeding is K21.00 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- K20-K31: Diseases of esophagus, stomach and duodenum (K20-K31)
- Category K21
- 5 codes (3 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to K21.00:
- Esophagitis (acute) (alkaline) (chemical) (chronic) (infectional) (necrotic) (peptic) (postoperative) (without bleeding) › reflux
- Esophagitis (acute) (alkaline) (chemical) (chronic) (infectional) (necrotic) (peptic) (postoperative) (without bleeding) › due to gastrointestinal reflux disease (without bleeding)
- Reflux › esophageal › with esophagitis (without bleeding)
- Reflux › gastroesophageal › with esophagitis (without bleeding)
- Disease, diseased › gastroesophageal reflux (GERD) › with esophagitis (without bleeding)
- Ulcer, ulcerated, ulcerating, ulceration, ulcerative › esophagus (peptic) › due to › gastrointestinal reflux disease (without bleeding)
- Allergy, allergic (reaction) (to) › milk protein › gastroesophageal reflux › with esophagitis (without bleeding)
Inclusion Terms
- Reflux esophagitis
U.S. Hospital Utilization
- An estimated 218,610 U.S. inpatient stays in 2023 included K21.00 among the documented diagnoses.
- 9,890 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
Chapter 11 reserved for future expansion11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026