2021 ICD-10-CM Diagnosis Code A03.1

Shigellosis due to Shigella flexneri

    2016 2017 2018 2019 2020 2021 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 2021 edition of ICD-10-CM A03.1 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of A03.1 - other international versions of ICD-10 A03.1 may differ.
Applicable To
  • Group B shigellosis
The following code(s) above A03.1 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 A03.1:
  • A00-B99
    2021 ICD-10-CM Range A00-B99

    Certain infectious and parasitic diseases

    Includes
    • diseases generally recognized as communicable or transmissible
    Type 1 Excludes
    • certain localized infections - see body system-related chapters
    Type 2 Excludes
    • carrier or suspected carrier of infectious disease (Z22.-)
    • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
    • infectious and parasitic diseases specific to the perinatal period (P35-P39)
    • influenza and other acute respiratory infections (J00-J22)
    Use Additional
    • code to identify resistance to antimicrobial drugs (Z16.-)
    Certain infectious and parasitic diseases
Approximate Synonyms
  • Infection due to group b shigella
ICD-10-CM A03.1 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 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

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): No change

Diagnosis Index entries containing back-references to A03.1:
  • 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 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 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 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 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 Billable/Specific Code
    • Bacillus A49.9
      ICD-10-CM Diagnosis Code A49.9

      Bacterial infection, unspecified

        2016 2017 2018 2019 2020 2021 Billable/Specific Code
      Type 1 Excludes
      • Flexner's A03.1
    • Shigella A03.9
      ICD-10-CM Diagnosis Code A03.9

      Shigellosis, unspecified

        2016 2017 2018 2019 2020 2021 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 Billable/Specific Code
    Applicable To
    • Bacillary dysentery NOS
    • Group B A03.1

ICD-10-CM Codes Adjacent To A03.1
A02.21 Salmonella meningitis
A02.22 Salmonella pneumonia
A02.23 Salmonella arthritis
A02.24 Salmonella osteomyelitis
A02.25 Salmonella pyelonephritis
A02.29 Salmonella with other localized infection
A02.8 Other specified salmonella infections
A02.9 Salmonella infection, unspecified
A03 Shigellosis
A03.0 Shigellosis due to Shigella dysenteriae
A03.1 Shigellosis due to Shigella flexneri
A03.2 Shigellosis due to Shigella boydii
A03.3 Shigellosis due to Shigella sonnei
A03.8 Other shigellosis
A03.9 Shigellosis, unspecified
A04 Other bacterial intestinal infections
A04.0 Enteropathogenic Escherichia coli infection
A04.1 Enterotoxigenic Escherichia coli infection
A04.2 Enteroinvasive Escherichia coli infection
A04.3 Enterohemorrhagic Escherichia coli infection
A04.4 Other intestinal Escherichia coli infections

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