1. ICD-10-CM Codes
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2. A00-B99
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3. A70-A74
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4. A70-
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5. 2023 ICD-10-CM Diagnosis Code A70

2023 ICD-10-CM Diagnosis Code A70

Chlamydia psittaci infections

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

• A70 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 A70 became effective on October 1, 2022.
• This is the American ICD-10-CM version of A70 - other international versions of ICD-10 A70 may differ.

• Ornithosis
• Psittacosis

• A bacterial infection caused by chlamydia psittaci. Humans are infected by handling sick birds. The chlamydia cause respiratory infection manifested with fever, malaise, cough, dyspnea, sore throat, photophobia and headaches.
• Infection with chlamydophila psittaci (formerly chlamydia psittaci), transmitted to humans by inhalation of dust-borne contaminated nasal secretions or excreta of infected birds. This infection results in a febrile illness characterized by pneumonitis and systemic manifestations.

• 865 Viral illness with mcc
• 866 Viral illness without mcc

Convert A70 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

• Type 1 Excludes: J16
  ICD-10-CM Diagnosis Code J16

  Pneumonia due to other infectious organisms, not elsewhere classified

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

  Code First

  • associated influenza, if applicable (J09.X1, J10.0-, J11.0-)

  Code Also

  • associated abscess, if applicable (J85.1)

  Type 1 Excludes

  • congenital pneumonia (P23.-)
  • ornithosis (A70)
  • pneumocystosis (B59)
  • pneumonia NOS (J18.9)

• Chlamydia, chlamydial A74.9
  ICD-10-CM Diagnosis Code A74.9

  Chlamydial infection, unspecified

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

  Applicable To

  • Chlamydiosis NOS
  • psittaci A70 (infection)
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
  ICD-10-CM Diagnosis Code R50.9

  Fever, unspecified

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

  Applicable To

  • Fever NOS
  • Fever of unknown origin [FUO]
  • Fever with chills
  • Fever with rigors
  • Hyperpyrexia NOS
  • Persistent fever
  • Pyrexia NOS
  • parrot A70
• 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
  • Chlamydia, chlamydial A74.9
    ICD-10-CM Diagnosis Code A74.9

    Chlamydial infection, unspecified

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

    Applicable To

    • Chlamydiosis NOS
    • psittaci A70
• Ornithosis A70
• Parrot fever A70
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) J18.9
  ICD-10-CM Diagnosis Code J18.9

  Pneumonia, unspecified organism

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • in (due to)
    • ornithosis A70
    • psittacosis A70
  • psittacosis A70
• Psittacosis A70

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