ICD-10-CM 2027
ICD-10 code for Mydriasis
From the official ICD-10-CM alphabetic index entry “Mydriasis (pupil)”. Page updated September 29, 2026.
About coding Mydriasis
The ICD-10-CM code for Mydriasis is H57.04 (Mydriasis).
Within H57.0 (anomalies of pupillary function), H57.04 is specifically for Mydriasis. Related codes cover unspecified anomaly of pupillary function (H57.00), Argyll Robertson pupil, atypical (H57.01), Anisocoria (H57.02), Miosis (H57.03), Tonic pupil (H57.05) and other anomalies of pupillary function (H57.09).
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 123 (Neurological Eye Disorders, relative weight 0.822), 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 Mydriasis ICD-10 codes
What is the ICD-10 code for Mydriasis?
- H57.04 — Mydriasis.
Is H57.04 billable?
- Yes. H57.04 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H57.04 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H57.04 as a principal diagnosis.
Is H57.04 a CC or MCC?
- No. H57.04 is neither a CC nor an MCC under MS-DRG v44.0.