1. ICD-10-CM Codes
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2. K00-K95 Diseases of the digestive system
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3. K20-K31 Diseases of esophagus, stomach and duodenum
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4. K21- Gastro-esophageal reflux disease
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5. 2021 ICD-10-CM Diagnosis Code K21.00

2021 ICD-10-CM Diagnosis Code K21.00

Gastro-esophageal reflux disease with esophagitis, without bleeding

2021 - New Code Billable/Specific Code

• K21.00 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Gastro-esophageal reflux dis with esophagitis, without bleed
• ICD-10-CM K21.00 is a new 2021 ICD-10-CM code that became effective on October 1, 2020.
• This is the American ICD-10-CM version of K21.00 - other international versions of ICD-10 K21.00 may differ.

• 391 Esophagitis, gastroenteritis and miscellaneous digestive disorders with mcc
• 392 Esophagitis, gastroenteritis and miscellaneous digestive disorders without mcc

• 2021 (effective 10/1/2020): New code

• Allergy, allergic (reaction) (to) T78.40
  ICD-10-CM Diagnosis Code T78.40

  Allergy, unspecified

  2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code

  Applicable To

  • Allergic reaction NOS
  • Hypersensitivity NOS
  • milk protein Z91.011
    - see also Allergy, food
    ICD-10-CM Diagnosis Code Z91.011

    Allergy to milk products

    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt

    Type 1 Excludes

    • lactose intolerance (E73.-)
    • gastroesophageal reflux K21.9
      - see also Reaction, adverse, food
      ICD-10-CM Diagnosis Code K21.9

      Gastro-esophageal reflux disease without esophagitis

      2016 2017 2018 2019 2020 2021 Billable/Specific Code

      Applicable To

      • Esophageal reflux NOS
      • with esophagitis (without bleeding) K21.00
• Disease, diseased - see also Syndrome
  • gastroesophageal reflux (GERD) K21.9
    ICD-10-CM Diagnosis Code K21.9

    Gastro-esophageal reflux disease without esophagitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Esophageal reflux NOS
    • with esophagitis (without bleeding) K21.00
• Esophagitis (acute) (alkaline) (chemical) (chronic) (infectional) (necrotic) (peptic) (postoperative) (without bleeding) K20.90
  ICD-10-CM Diagnosis Code K20.90

  Esophagitis, unspecified without bleeding

  2021 - New Code Billable/Specific Code

  Applicable To

  • Esophagitis NOS
  • due to gastrointestinal reflux disease (without bleeding) K21.00
  • reflux K21.00
• Reflux K21.9
  ICD-10-CM Diagnosis Code K21.9

  Gastro-esophageal reflux disease without esophagitis

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Esophageal reflux NOS
  • esophageal K21.9
    ICD-10-CM Diagnosis Code K21.9

    Gastro-esophageal reflux disease without esophagitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Esophageal reflux NOS
    • with esophagitis (without bleeding) K21.00
  • gastroesophageal K21.9
    ICD-10-CM Diagnosis Code K21.9

    Gastro-esophageal reflux disease without esophagitis

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Esophageal reflux NOS
    • with esophagitis (without bleeding) K21.00
• Ulcer, ulcerated, ulcerating, ulceration, ulcerative
  • esophagus (peptic) K22.10
    ICD-10-CM Diagnosis Code K22.10

    Ulcer of esophagus without bleeding

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Ulcer of esophagus NOS
    • due to
      • gastrointestinal reflux disease (without bleeding) K21.00

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