2024 ICD-10-CM Diagnosis Code A74.9

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Chlamydial infection, unspecified

  • A74.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM A74.9 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of A74.9 – other international versions of ICD-10 A74.9 may differ.

Applicable To

  • Chlamydiosis NOS

The following code(s) above A74.9 contain annotation back-references

 that may be applicable to A74.9:

  • A00-B99  Certain infectious and parasitic diseases
  • A70-A74  Other diseases caused by chlamydiae
  • A74  Other diseases caused by chlamydiae

Approximate Synonyms

  • Chlamydia in pregnancy
  • Chlamydia infection
  • Chlamydia infection in childbirth
  • Chlamydia trachomatis infection
  • Chlamydia trachomatis infection in childbirth
  • Chlamydia trachomatis infection in pregnancy
  • Chlamydial infection
  • Chlamydial infection postpartum
  • Postpartum (after childbirth) chlamydia infection

Clinical Information

  • 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.
  • Chlamydia is a widespread sexually transmitted infection caused by bacteria. It is transmitted through sexual contact with an infected individual. Both men and women are susceptible to chlamydia. Often, chlamydia does not present any symptoms, but when it does, you may experience a burning sensation during urination or notice an unusual discharge from the vagina or penis. In both sexes, chlamydia can affect the urinary tract. In women, it can infect the reproductive system, potentially leading to pelvic inflammatory disease, which can cause infertility or severe pregnancy complications. Newborns from infected mothers risk developing eye infections and pneumonia. In men, chlamydia can affect the epididymis, the tube that carries sperm, resulting in pain, fever, and, rarely, infertility. Chlamydia can be effectively treated with antibiotics. To reduce the risk of infection, sexually active individuals should use condoms. Health experts recommend annual chlamydia screening for women aged 25 and younger.
  • Diseases associated with bacteria from the family chlamydiaceae.
  • Infections with bacteria of the genus chlamydia.

ICD-10-CM A74.9 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

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

Convert A74.9 to ICD-9-CMCode 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
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change

Code annotations containing back-references to A74.9:

  • Type 1 Excludes: A49

Diagnosis Index entries containing back-references to A74.9: