1. ICD-10-CM Codes
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2. A00-B99 Certain infectious and parasitic diseases
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3. A00-A09 Intestinal infectious diseases
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4. A07- Other protozoal intestinal diseases
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5. 2021 ICD-10-CM Diagnosis Code A07.1

2021 ICD-10-CM Diagnosis Code A07.1

Giardiasis [lambliasis]

2016 2017 2018 2019 2020 2021 Billable/Specific Code

• A07.1 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 A07.1 became effective on October 1, 2020.
• This is the American ICD-10-CM version of A07.1 - other international versions of ICD-10 A07.1 may differ.

• Giardiasis

• An infection of the small intestine caused by the flagellated protozoan giardia lamblia. It is spread via contaminated food and water and by direct person-to-person contact.
• Infection of the small intestine caused by the flagellated protozoan giardia lamlia; spread via contaminated food and water and by direct person to person contact.
• Small bowel infection caused by a parasite named giardia lamblia

• 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 A07.1 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

• Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
  - see also Enteritis
  ICD-10-CM Diagnosis Code K52.9

  Noninfective gastroenteritis and colitis, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Colitis NOS
  • Enteritis NOS
  • Gastroenteritis NOS
  • Ileitis NOS
  • Jejunitis NOS
  • Sigmoiditis NOS

  Type 1 Excludes

  • diarrhea NOS (R19.7)
  • functional diarrhea (K59.1)
  • infectious gastroenteritis and colitis NOS (A09)
  • neonatal diarrhea (noninfective) (P78.3)
  • psychogenic diarrhea (F45.8)
  • giardial A07.1
• 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)
  • Giardia lamblia A07.1
  • giardial A07.1
• 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)
  • Giardia lamblia A07.1
  • Lamblia A07.1
• Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) K52.9
  ICD-10-CM Diagnosis Code K52.9

  Noninfective gastroenteritis and colitis, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Colitis NOS
  • Enteritis NOS
  • Gastroenteritis NOS
  • Ileitis NOS
  • Jejunitis NOS
  • Sigmoiditis NOS

  Type 1 Excludes

  • diarrhea NOS (R19.7)
  • functional diarrhea (K59.1)
  • infectious gastroenteritis and colitis NOS (A09)
  • neonatal diarrhea (noninfective) (P78.3)
  • psychogenic diarrhea (F45.8)
  • giardial A07.1
• Giardiasis A07.1
• 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
  • Giardia lamblia A07.1
• Infestation B88.9
  ICD-10-CM Diagnosis Code B88.9

  Infestation, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Infestation (skin) NOS
  • Infestation by mites NOS
  • Skin parasites NOS
  • Giardia lamblia A07.1
• Lambliasis, lambliosis A07.1

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