A74.0Chlamydial conjunctivitis

A74.0 is the ICD-10-CM diagnosis code for chlamydial conjunctivitis. It belongs to category A74 (other diseases caused by chlamydiae), block A70-A74 (other diseases caused by chlamydiae) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A74 (other diseases caused by chlamydiae), A74.0 is specifically for chlamydial conjunctivitis. Related codes cover other chlamydial diseases (A74.8) and chlamydial infection, unspecified (A74.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent, relative weight 1.2471) and DRG 125 (Other Disorders of the Eye without MCC, relative weight 0.7702), in MDC 02 (Diseases and Disorders of the Eye), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 077.0 (inclusion conjunctivitis) and 077.98 (unspecified diseases of conjunctiva due to chlamydiae).