K21
Non-billableGastro-esophageal reflux disease
Gastro-esophageal reflux disease
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- newborn esophageal reflux (P78.83)
Excludes 2
Conditions not included here, but the patient may have both
- 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)
- hiatus hernia (K44.-)
Child Codes (2)
Also Known As / Clinical Terms
UMLS
- Acid RefluxC0017168
- Acid Reflux, GastricC0017168
- Acid reflux diseaseC0017168
- Esophageal RefluxC0017168
- Esophageal reflux NOSC0017168
- GASTROESOPHAGEAL REFLUXC0017168
- GASTROESOPHAGEAL REFLUX DISC0017168
- GASTROESOPHAGEAL REFLUX DISEASEC0017168
- GERC0017168
- GERDC0017168
- GERD - Gastro-esophageal reflux diseaseC0017168
- GOR - Gastro-esophageal refluxC0017168
- GOR - Gastro-oesophageal refluxC0017168
- GORDC0017168
- GORD - Gastro-esophageal reflux diseaseC0017168
- GORD - Gastro-oesophageal reflux diseaseC0017168
- Gastric Acid RefluxC0017168
- Gastric Acid Reflux DiseaseC0017168
- Gastro Esophageal RefluxC0017168
- Gastro Esophageal Reflux DiseaseC0017168
- Gastro oesophageal RefluxC0017168
- Gastro-Esophageal RefluxC0017168
- Gastro-Esophageal Reflux DiseaseC0017168
- Gastro-Esophageal Reflux DiseasesC0017168
- Gastro-esophageal refluxC0017168
- Gastro-esophageal reflux diseaseC0017168
- Gastro-oesophageal RefluxC0017168
- Gastro-oesophageal refluxC0017168
- Gastro-oesophageal reflux diseaseC0017168
- Gastroesophageal RefluxC0017168
- Gastroesophageal Reflux DiseaseC0017168
- Gastroesophageal reflux diseaseC0017168
- Gastroesophageal reflux disease (disorder)C0017168
- Gastrooesophageal reflux diseaseC0017168
- HeartburnC0017168
- Reflux Disease, Gastro-EsophagealC0017168
- Reflux, Gastric AcidC0017168
- Reflux, Gastro-EsophagealC0017168
- Reflux, Gastro-oesophagealC0017168
- Reflux, GastroesophagealC0017168
- acid refluxC0017168
- disease gastro-esophageal refluxC0017168
- diseases esophageal refluxC0017168
- esophageal refluxC0017168
- esophageal reflux diseaseC0017168
- gastresophageal reflux diseaseC0017168
- gastro esophageal refluxC0017168
- gastro oesophageal refluxC0017168
- gastro-esophageal refluxC0017168
- gastro-esophageal reflux diseaseC0017168
- gastro-oesophageal refluxC0017168
- gastroesophageal refluxC0017168
- gastroesophageal reflux diseaseC0017168
- gastroesophageal reflux disease (GERD)C0017168
- gastrooesophageal refluxC0017168
- gastrooesophageal reflux diseaseC0017168
- ge refluxC0017168
- gerdC0017168
- oesophageal refluxC0017168
- reflux acidC0017168
- reflux disease esophagealC0017168
- reflux esophagealC0017168
- reflux gastroesophagealC0017168
Frequently Asked Questions
What is ICD-10 code K21?
ICD-10-CM code K21 represents "Gastro-esophageal reflux disease". It is a non-billable header code — use a more specific child code for billing purposes.
Is K21 a billable code?
No, K21 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 2 child codes under K21.
What chapter is K21 in?
K21 is in Chapter 11: Diseases of the Digestive System (codes K00-K95).
What codes cannot be used with K21?
K21 has Excludes1 notes indicating codes that cannot be used together with it, including: newborn esophageal reflux (P78.83).
What are the subcategories under K21?
K21 has 2 child codes, including: K21.0 (Gastro-esophageal reflux disease with esophagitis), K21.9 (Gastro-esophageal reflux disease without esophagitis).
What are the UMLS CUIs for K21?
K21 is linked to 1 UMLS Concept Unique Identifier: C0017168. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.