ICD-10-CM 2027
ICD-10 code for Anisocoria
From the official ICD-10-CM alphabetic index entry “Anisocoria (pupil)”. Page updated September 29, 2026.
About coding Anisocoria
The ICD-10-CM code for Anisocoria is H57.02 (Anisocoria). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on H57.02.
Within H57.0 (anomalies of pupillary function), H57.02 is specifically for Anisocoria. Related codes cover unspecified anomaly of pupillary function (H57.00), Argyll Robertson pupil, atypical (H57.01), Miosis (H57.03), Mydriasis (H57.04), 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.
More specific Anisocoria codes (official index)
- congenital Q13.2 — Other congenital malformations of iris
Common questions about Anisocoria ICD-10 codes
What is the ICD-10 code for Anisocoria?
- H57.02 — Anisocoria. More specific codes apply when the documentation supports them: Q13.2.
What is the ICD-10 code for congenital anisocoria?
- Q13.2 — Other congenital malformations of iris.
Is H57.02 billable?
- Yes. H57.02 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H57.02 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H57.02 as a principal diagnosis.
Is H57.02 a CC or MCC?
- No. H57.02 is neither a CC nor an MCC under MS-DRG v44.0.