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ICD-10-CM 2027 diagnosis code

Q12.3Congenital aphakia

✓ Billable / specificPOA exempt

Q12.3 is a valid, billable ICD-10-CM code for congenital aphakia. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q12.3

Q12.3 is the ICD-10-CM diagnosis code for congenital aphakia. It belongs to category Q12 (congenital lens malformations), block Q10-Q18 (congenital malformations of eye, ear, face and neck) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

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.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 743.35 (congenital aphakia).

Notes that apply from higher levels

Instructions written at a parent level also apply to Q12.3.

Broader instructions also apply from Q10-Q18 Congenital malformations of eye, ear, face and neck and Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to Q12.3.

Codes whose notes reference Q12.3

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Q12.3

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.

What DRG does Q12.3 group to?

Q12.3 is used in the MS-DRG v44.0 logic for MS-DRG 124 (Other Disorders of the Eye with MCC or Thrombolytic Agent) and MS-DRG 125 (Other Disorders of the Eye without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for Q12.3?

The CMS General Equivalence Mappings map Q12.3 to ICD-9-CM 743.35.