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ICD-10-CM 2027 diagnosis code

H00.034Abscess of left upper eyelid

✓ Billable / specific

H00.034 is a valid, billable ICD-10-CM code for abscess of left upper eyelid. 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 H00.034

H00.034 is the ICD-10-CM diagnosis code for abscess of left upper eyelid. It belongs to category H00 (Hordeolum and chalazion), block H00-H05 (disorders of eyelid, lacrimal system and orbit) 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 H00.03 (abscess of eyelid), H00.034 is specifically for abscess of left upper eyelid. Related codes cover right upper eyelid (H00.031), right lower eyelid (H00.032), right eye, unspecified eyelid (H00.033), left lower eyelid (H00.035), left eye, unspecified eyelid (H00.036) and unspecified eye, unspecified eyelid (H00.039).

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 373.13 (abscess of eyelid).

Notes that apply from higher levels

Instructions written at a parent level also apply to H00.034.

Broader instructions also apply from H00-H05 Disorders of eyelid, lacrimal system and orbit and 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 →
  • 373.13Abscess of eyelidapproximate

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 H00.034

Is H00.034 billable?

Yes. H00.034 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can H00.034 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict H00.034 as a principal diagnosis.

Is H00.034 a CC or MCC?

No. H00.034 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does H00.034 group to?

H00.034 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 H00.034?

The CMS General Equivalence Mappings map H00.034 to ICD-9-CM 373.13.