ICD-10-CM 2027
ICD-10 code for chlamydial conjunctivitis nos
From the official ICD-10-CM alphabetic index entry “Conjunctivitis (staphylococcal) (streptococcal) NOS › chlamydial”. Page updated September 29, 2026.
About coding chlamydial conjunctivitis nos
The ICD-10-CM code for chlamydial conjunctivitis nos is A74.0 (Chlamydial conjunctivitis). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A74.0.
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.
More specific chlamydial conjunctivitis nos codes (official index)
Common questions about chlamydial conjunctivitis nos ICD-10 codes
What is the ICD-10 code for chlamydial conjunctivitis nos?
- A74.0 — Chlamydial conjunctivitis. More specific codes apply when the documentation supports them: A71.1, P39.1.
What is the ICD-10 code for neonatal chlamydial conjunctivitis nos?
- P39.1 — Neonatal conjunctivitis and dacryocystitis.
Is A74.0 billable?
- Yes. A74.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A74.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A74.0 as a principal diagnosis.
Is A74.0 a CC or MCC?
- No. A74.0 is neither a CC nor an MCC under MS-DRG v44.0.