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ICD-10-CM 2027 diagnosis code

H52.31Anisometropia

✓ Billable / specific

H52.31 is a valid, billable ICD-10-CM code for anisometropia. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About H52.31

H52.31 is the ICD-10-CM diagnosis code for Anisometropia. It belongs to category H52 (disorders of refraction and accommodation), block H49-H52 (disorders of ocular muscles, binocular movement, accommodation and refraction) 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 H52.3 (Anisometropia and aniseikonia), H52.31 is specifically for Anisometropia. Related codes cover aniseikonia (H52.32).

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 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 367.31 (Anisometropia).

Notes that apply from higher levels

Instructions written at a parent level also apply to H52.31.

Broader instructions also apply from H49-H52 Disorders of ocular muscles, binocular movement, accommodation and refraction and Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to H52.31.

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

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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 H52.31

Is H52.31 billable?

Yes. H52.31 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H52.31 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H52.31 as a principal diagnosis.

Is H52.31 a CC or MCC?

No. H52.31 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H52.31 group to?

H52.31 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 H52.31?

The CMS General Equivalence Mappings map H52.31 to ICD-9-CM 367.31.