1. ICD-10-CM Codes
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2. A00-B99
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3. A00-A09
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4. A03-
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5. 2023 ICD-10-CM Diagnosis Code A03.1

2023 ICD-10-CM Diagnosis Code A03.1

Shigellosis due to Shigella flexneri

2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

• A03.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2023 edition of ICD-10-CM A03.1 became effective on October 1, 2022.
• This is the American ICD-10-CM version of A03.1 - other international versions of ICD-10 A03.1 may differ.

• Infection due to group b shigella

• 371 Major gastrointestinal disorders and peritoneal infections with mcc
• 372 Major gastrointestinal disorders and peritoneal infections with cc
• 373 Major gastrointestinal disorders and peritoneal infections without cc/mcc

Convert A03.1 to ICD-9-CM

• 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): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change

• Bacillus - see also Infection, bacillus
  • Flexner's A03.1
• Diarrhea, diarrheal (disease) (infantile) (inflammatory) R19.7
  ICD-10-CM Diagnosis Code R19.7

  Diarrhea, unspecified

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

  Applicable To

  • Diarrhea NOS

  Type 1 Excludes

  • functional diarrhea (K59.1)
  • neonatal diarrhea (P78.3)
  • psychogenic diarrhea (F45.8)
  • Flexner's A03.1 (ulcerative)
• Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) A09
  ICD-10-CM Diagnosis Code A09

  Infectious gastroenteritis and colitis, unspecified

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

  Applicable To

  • Infectious colitis NOS
  • Infectious enteritis NOS
  • Infectious gastroenteritis NOS

  Type 1 Excludes

  • colitis NOS (K52.9)
  • diarrhea NOS (R19.7)
  • enteritis NOS (K52.9)
  • gastroenteritis NOS (K52.9)
  • noninfective gastroenteritis and colitis, unspecified (K52.9)
  • bacillary A03.9
    ICD-10-CM Diagnosis Code A03.9

    Shigellosis, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Bacillary dysentery NOS
    • Shigella A03.9
      ICD-10-CM Diagnosis Code A03.9

      Shigellosis, unspecified

      2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

      Applicable To

      • Bacillary dysentery NOS
      • flexneri A03.1
      • group B A03.1
    • Flexner A03.1
  • Flexner's A03.1
  • Hiss-Russell A03.1
• Flexner's dysentery A03.1
• Hiss-Russell dysentery A03.1
• Infection, infected, infective (opportunistic) B99.9
  ICD-10-CM Diagnosis Code B99.9

  Unspecified infectious disease

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • Bacillus A49.9
    ICD-10-CM Diagnosis Code A49.9

    Bacterial infection, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Type 1 Excludes

    • bacteremia NOS (R78.81)
    • Flexner's A03.1
  • Shigella A03.9
    ICD-10-CM Diagnosis Code A03.9

    Shigellosis, unspecified

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

    Applicable To

    • Bacillary dysentery NOS
    • group
      • B A03.1
    • flexneri A03.1
• Shigellosis A03.9
  ICD-10-CM Diagnosis Code A03.9

  Shigellosis, unspecified

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

  Applicable To

  • Bacillary dysentery NOS
  • Group B A03.1

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