2022 ICD-10-CM Diagnosis Code A74.9

Chlamydial infection, unspecified

    2016 2017 2018 2019 2020 2021 2022 Billable/Specific Code
  • A74.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2022 edition of ICD-10-CM A74.9 became effective on October 1, 2021.
  • 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
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 A74.9:
  • A00-B99
    2022 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
  • A70-A74
    2022 ICD-10-CM Range A70-A74

    Other diseases caused by chlamydiae

    Type 1 Excludes
    • sexually transmitted chlamydial diseases (A55-A56)
    Other diseases caused by chlamydiae
  • A74
    ICD-10-CM Diagnosis Code A74

    Other diseases caused by chlamydiae

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • neonatal chlamydial conjunctivitis (P39.1)
    • neonatal chlamydial pneumonia (P23.1)
    • Reiter's disease (M02.3-)
    • sexually transmitted chlamydial diseases (A55-A56)
    Type 2 Excludes
    • chlamydial pneumonia (J16.0)
    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 common sexually transmitted disease caused by bacteria. You get it by having sex or sexual contact with someone who is infected. Both men and women can get it. Chlamydia usually doesn't cause symptoms. If it does, you might notice a burning feeling when you urinate or abnormal discharge from your vagina or penis. In both men and women, chlamydia can infect the urinary tract. In women, infection of the reproductive system can lead to pelvic inflammatory disease, which can cause infertility or serious problems with pregnancy. Babies born to infected mothers can get eye infections and pneumonia from chlamydia. In men, chlamydia can infect the epididymis, the tube that carries sperm. This can cause pain, fever and rarely, infertility. You can cure chlamydia with antibiotics. If you are sexually active, you can decrease your risk of getting it by using condoms. Experts recommend that women 25 and younger get a chlamydia test every year.
  • 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 v39.0):
  • 865 Viral illness with mcc
  • 866 Viral illness without mcc

Convert A74.9 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
  • 2022 (effective 10/1/2021): No change
Code annotations containing back-references to A74.9:
  • Type 1 Excludes: A49
    ICD-10-CM Diagnosis Code A49

    Bacterial infection of unspecified site

      2016 2017 2018 2019 2020 2021 2022 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • bacterial agents as the cause of diseases classified elsewhere (B95-B96)
    • chlamydial infection NOS (A74.9)
    • meningococcal infection NOS (A39.9)
    • rickettsial infection NOS (A79.9)
    • spirochetal infection NOS (A69.9)

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

ICD-10-CM Codes Adjacent To A74.9
A70 Chlamydia psittaci infections
A71 Trachoma
A71.0 Initial stage of trachoma
A71.1 Active stage of trachoma
A71.9 Trachoma, unspecified
A74 Other diseases caused by chlamydiae
A74.0 Chlamydial conjunctivitis
A74.8 Other chlamydial diseases
A74.81 Chlamydial peritonitis
A74.89 Other chlamydial diseases
A74.9 Chlamydial infection, unspecified
A75 Typhus fever
A75.0 Epidemic louse-borne typhus fever due to Rickettsia prowazekii
A75.1 Recrudescent typhus [Brill's disease]
A75.2 Typhus fever due to Rickettsia typhi
A75.3 Typhus fever due to Rickettsia tsutsugamushi
A75.9 Typhus fever, unspecified
A77 Spotted fever [tick-borne rickettsioses]
A77.0 Spotted fever due to Rickettsia rickettsii
A77.1 Spotted fever due to Rickettsia conorii
A77.2 Spotted fever due to Rickettsia siberica

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