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ICD-10-CM 2027 diagnosis code

H26.042Anterior subcapsular polar infantile and juvenile cataract, left eye

✓ Billable / specificPediatric · age 0–17

H26.042 is a valid, billable ICD-10-CM code for anterior subcapsular polar infantile and juvenile cataract, left eye. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Ant subcapsular polar infantile and juv cataract, left eye

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 H26.042

H26.042 is the ICD-10-CM diagnosis code for anterior subcapsular polar infantile and juvenile cataract, left eye. It belongs to category H26 (other cataract), block H25-H28 (disorders of lens) and chapter 7 (diseases of the eye and adnexa). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within H26.04 (anterior subcapsular polar infantile and juvenile cataract), H26.042 is specifically for anterior subcapsular polar infantile and juvenile cataract, left eye. Related codes cover right eye (H26.041), bilateral (H26.043) and unspecified eye (H26.049).

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.

The Medicare Code Editor expects this diagnosis only for patients age 0 through 17; other ages trigger an age-conflict edit.

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 366.01 (anterior subcapsular polar cataract).

Notes that apply from higher levels

Instructions written at a parent level also apply to H26.042.

› From H26 Other cataract
Excludes1
  • congenital cataract (Q12.0)

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

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 →
  • 366.01Anterior subcapsular polar cataractapproximate

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 H26.042

Is H26.042 billable?

Yes. H26.042 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H26.042 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H26.042 as a principal diagnosis.

Is H26.042 a CC or MCC?

No. H26.042 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H26.042 group to?

H26.042 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 H26.042?

The CMS General Equivalence Mappings map H26.042 to ICD-9-CM 366.01.