2024 ICD-10-CM Diagnosis Code A56.4

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Chlamydial infection of pharynx

  • A56.4 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 A56.4 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of A56.4 – other international versions of ICD-10 A56.4 may differ.

The following code(s) above A56.4 contain annotation back-references

 that may be applicable to A56.4:

  • A00-B99  Certain infectious and parasitic diseases
  • A50-A64  Infections with a predominantly sexual mode of transmission
  • A56  Other sexually transmitted chlamydial diseases

Approximate Synonyms

  • Chlamydia pharyngitis
  • Chlamydial pharyngitis

ICD-10-CM A56.4 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 011 Tracheostomy for face, mouth and neck diagnoses or laryngectomy with mcc
  • 012 Tracheostomy for face, mouth and neck diagnoses or laryngectomy with cc
  • 013 Tracheostomy for face, mouth and neck diagnoses or laryngectomy without cc/mcc
  • 152 Otitis media and uri with mcc
  • 153 Otitis media and uri without mcc

Convert A56.4 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

Diagnosis Index entries containing back-references to A56.4: