K21.9

Gastro-esophageal reflux disease without esophagitis

K21.9 is from the 2021 edition of ICD-10-CM, which is effective on October 1, 2020. K21.9 is the American ICD-10-CM version. Other international versions of the ICD-10 code of K21.9 may vary.

Billable 2021 ICD-10-CM Diagnosis Code

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[toggle title=’Additional Details’]This code comes under Chapter 11


Chapter 11 contains the following blocks:

  • K00-K14 Diseases of oral cavity and salivary glands
  • K20-K31 Diseases of esophagus, stomach and duodenum
  • K35-K38 Diseases of appendix
  • K40-K46 Hernia
  • K50-K52 Noninfective enteritis and colitis
  • K55-K64 Other diseases of intestines
  • K65-K68 Diseases of peritoneum and retroperitoneum
  • K70-K77 Diseases of liver
  • K80-K87 Disorders of gallbladder, biliary tract and pancreas
  • K90-K95 Other diseases of the digestive system




Below is some additional information from Chapter 11


Diseases of the digestive system (K00-K95)

Excludes2: 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).[/toggle]

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