1. ICD-10-CM Codes
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2. A00-B99 Certain infectious and parasitic diseases
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3. A70-A74 Other diseases caused by chlamydiae
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4. A74- Other diseases caused by chlamydiae
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2018/2019 ICD-10-CM Diagnosis Code A74.9

Chlamydial infection, unspecified

2016 2017 2018 2019 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 2018/2019 edition of ICD-10-CM A74.9 became effective on October 1, 2018.
• This is the American ICD-10-CM version of A74.9 - other international versions of ICD-10 A74.9 may differ.

• 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

• 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.

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

Convert A74.9 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

• Type 1 Excludes: A49
  ICD-10-CM Diagnosis Code A49

  Bacterial infection of unspecified site

  2016 2017 2018 2019 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)

• Chlamydia, chlamydial A74.9
• Disease, diseased - see also Syndrome
  • chlamydial A74.9
• Infection, infected, infective (opportunistic) B99.9
  ICD-10-CM Diagnosis Code B99.9

  Unspecified infectious disease

  2016 2017 2018 2019 Billable/Specific Code
  • Chlamydia, chlamydial A74.9

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