ICD-10-CM 2027
ICD-10 code for Monofixation syndrome
From the official ICD-10-CM alphabetic index entry “Syndrome › monofixation”. Page updated September 29, 2026.
About coding Monofixation syndrome
The ICD-10-CM code for Monofixation syndrome is H50.42 (Monofixation syndrome).
Within H50.4 (other and unspecified heterotropia), H50.42 is specifically for Monofixation syndrome. Related codes cover unspecified heterotropia (H50.40), Cyclotropia (H50.41) and Accommodative component in esotropia (H50.43).
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.
Common questions about Monofixation syndrome ICD-10 codes
What is the ICD-10 code for Monofixation syndrome?
- H50.42 — Monofixation syndrome.
Is H50.42 billable?
- Yes. H50.42 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H50.42 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H50.42 as a principal diagnosis.
Is H50.42 a CC or MCC?
- No. H50.42 is neither a CC nor an MCC under MS-DRG v44.0.