ICD-10-CM 2027
ICD-10 code for congenital aphakia
From the official ICD-10-CM alphabetic index entry “Aphakia (acquired) (postoperative) › congenital”. Page updated September 29, 2026.
About coding congenital aphakia
The ICD-10-CM code for congenital aphakia is Q12.3 (Congenital aphakia).
Within Q12 (congenital lens malformations), Q12.3 is specifically for congenital aphakia. Related codes cover congenital cataract (Q12.0), congenital displaced lens (Q12.1), coloboma of lens (Q12.2), Spherophakia (Q12.4), other congenital lens malformations (Q12.8) and congenital lens malformation, unspecified (Q12.9).
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 congenital aphakia ICD-10 codes
What is the ICD-10 code for congenital aphakia?
- Q12.3 — Congenital aphakia.
Is Q12.3 billable?
- Yes. Q12.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q12.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q12.3 as a principal diagnosis.
Is Q12.3 a CC or MCC?
- No. Q12.3 is neither a CC nor an MCC under MS-DRG v44.0.