ICD-10-CM 2027
ICD-10 code for Peter's anomaly
From the official ICD-10-CM alphabetic index entry “Anomaly, anomalous (congenital) (unspecified type) › Peter's”. Page updated September 29, 2026.
About coding Peter's anomaly
The ICD-10-CM code for Peter's anomaly is Q13.4 (Other congenital corneal malformations).
Within Q13, choose Q13.4 (Other congenital corneal malformations) only when documentation doesn't support a more specific option: coloboma of iris (Q13.0), absence of iris (Q13.1), other congenital malformations of iris (Q13.2), congenital corneal opacity (Q13.3), Blue sclera (Q13.5), other congenital malformations of anterior segment of eye (Q13.8) and congenital malformation of anterior segment of eye, unspecified (Q13.9).
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 Peter's anomaly ICD-10 codes
What is the ICD-10 code for Peter's anomaly?
- Q13.4 — Other congenital corneal malformations.
Is Q13.4 billable?
- Yes. Q13.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q13.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q13.4 as a principal diagnosis.
Is Q13.4 a CC or MCC?
- No. Q13.4 is neither a CC nor an MCC under MS-DRG v44.0.