ICD-10-CM 2027
ICD-10 code for syphilitic secondary iridocyclitis
From the official ICD-10-CM alphabetic index entry “Iridocyclitis › syphilitic (secondary)”. Page updated September 29, 2026.
About coding syphilitic secondary iridocyclitis
The ICD-10-CM code for syphilitic secondary iridocyclitis is A51.43 (Secondary syphilitic oculopathy).
Within A51.4 (other secondary syphilis), A51.43 is specifically for secondary syphilitic oculopathy. Related codes cover secondary syphilitic meningitis (A51.41), secondary syphilitic female pelvic disease (A51.42), secondary syphilitic nephritis (A51.44), secondary syphilitic hepatitis (A51.45), secondary syphilitic osteopathy (A51.46) and other secondary syphilitic conditions (A51.49).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
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.
Common questions about syphilitic secondary iridocyclitis ICD-10 codes
What is the ICD-10 code for syphilitic secondary iridocyclitis?
- A51.43 — Secondary syphilitic oculopathy.
Is A51.43 billable?
- Yes. A51.43 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A51.43 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A51.43 as a principal diagnosis.
Is A51.43 a CC or MCC?
- A51.43 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.