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ICD-10-CM 2027 diagnosis code

H40.031Anatomical narrow angle, right eye

✓ Billable / specific

H40.031 is a valid, billable ICD-10-CM code for anatomical narrow angle, right eye. 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 H40.031

H40.031 is the ICD-10-CM diagnosis code for anatomical narrow angle, right eye. It belongs to category H40 (glaucoma), block H40-H42 (glaucoma) 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 H40.03 (anatomical narrow angle), H40.031 is specifically for anatomical narrow angle, right eye. Related codes cover left eye (H40.032), bilateral (H40.033) and unspecified eye (H40.039).

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 365.02 (anatomical narrow angle borderline glaucoma).

Notes that apply from higher levels

Instructions written at a parent level also apply to H40.031.

› From H40 Glaucoma
Excludes1
  • absolute glaucoma (H44.51-)
  • congenital glaucoma (Q15.0)
  • traumatic glaucoma due to birth injury (P15.3)

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 →
  • 365.02Anatomical narrow angle borderline glaucomaapproximate

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 H40.031

Is H40.031 billable?

Yes. H40.031 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H40.031 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H40.031 as a principal diagnosis.

Is H40.031 a CC or MCC?

No. H40.031 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H40.031 group to?

H40.031 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 H40.031?

The CMS General Equivalence Mappings map H40.031 to ICD-9-CM 365.02.