2021 ICD-10-CM Diagnosis Code K21.0

Gastro-esophageal reflux disease with esophagitis

    2016 2017 2018 2019 2020 2021 - Converted to Parent Code Non-Billable/Non-Specific Code
  • K21.0 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • ICD-10-CM K21.0 is a new 2021 ICD-10-CM code that became effective on October 1, 2020.
  • This is the American ICD-10-CM version of K21.0 - other international versions of ICD-10 K21.0 may differ.
The following code(s) above K21.0 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to K21.0:
  • K00-K95
    2021 ICD-10-CM Range K00-K95

    Diseases of the digestive system

    Type 2 Excludes
    • 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)
    Diseases of the digestive system
  • K20-K31
    2021 ICD-10-CM Range K20-K31

    Diseases of esophagus, stomach and duodenum

    Type 2 Excludes
    Diseases of esophagus, stomach and duodenum
  • K21
    ICD-10-CM Diagnosis Code K21

    Gastro-esophageal reflux disease

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • newborn esophageal reflux (P78.83)
    Gastro-esophageal reflux disease
Approximate Synonyms
  • Reflux esophagitis
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): Deleted code
  • 2021 (effective 10/1/2020): New code
Code annotations containing back-references to K21.0:
  • Type 1 Excludes: K20
    , K20
    ICD-10-CM Diagnosis Code K20

    Esophagitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • erosion of esophagus (K22.1-)
    • esophagitis with gastro-esophageal reflux disease (K21.0-)
    • reflux esophagitis (K21.0-)
    • ulcerative esophagitis (K22.1-)
    Type 2 Excludes
    • eosinophilic gastritis or gastroenteritis (K52.81)
    Use Additional
    • code to identify:
    • alcohol abuse and dependence (F10.-)
    ICD-10-CM Diagnosis Code K20

    Esophagitis

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • erosion of esophagus (K22.1-)
    • esophagitis with gastro-esophageal reflux disease (K21.0-)
    • reflux esophagitis (K21.0-)
    • ulcerative esophagitis (K22.1-)
    Type 2 Excludes
    • eosinophilic gastritis or gastroenteritis (K52.81)
    Use Additional
    • code to identify:
    • alcohol abuse and dependence (F10.-)
ICD-10-CM Codes Adjacent To K21.0
K14.9 Disease of tongue, unspecified
K20 Esophagitis
K20.0 Eosinophilic esophagitis
K20.8 Other esophagitis
K20.80 …… without bleeding
K20.81 …… with bleeding
K20.9 Esophagitis, unspecified
K20.90 …… without bleeding
K20.91 …… with bleeding
K21 Gastro-esophageal reflux disease
K21.0 Gastro-esophageal reflux disease with esophagitis
K21.00 …… without bleeding
K21.01 …… with bleeding
K21.9 Gastro-esophageal reflux disease without esophagitis
K22 Other diseases of esophagus
K22.0 Achalasia of cardia
K22.1 Ulcer of esophagus
K22.10 …… without bleeding
K22.11 …… with bleeding
K22.2 Esophageal obstruction
K22.3 Perforation of esophagus

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.