ICD-10-CM 2027
ICD-10 code for iris paralysis
From the official ICD-10-CM alphabetic index entry “Paralysis, paralytic (complete) (incomplete) › iris”. Page updated September 29, 2026.
About coding iris paralysis
The ICD-10-CM code for iris paralysis is H57.09 (Other anomalies of pupillary function). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on H57.09.
Within H57.0, choose H57.09 (Other anomalies of pupillary function) only when documentation doesn't support a more specific option: unspecified anomaly of pupillary function (H57.00), Argyll Robertson pupil, atypical (H57.01), Anisocoria (H57.02), Miosis (H57.03), Mydriasis (H57.04) and Tonic pupil (H57.05).
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.
More specific iris paralysis codes (official index)
- due to diphtheria (toxin) A36.89 — Other diphtheritic complications
Common questions about iris paralysis ICD-10 codes
What is the ICD-10 code for iris paralysis?
- H57.09 — Other anomalies of pupillary function. More specific codes apply when the documentation supports them: A36.89.
Is H57.09 billable?
- Yes. H57.09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H57.09 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H57.09 as a principal diagnosis.
Is H57.09 a CC or MCC?
- No. H57.09 is neither a CC nor an MCC under MS-DRG v44.0.