ICD-10-CM 2027
ICD-10 code for internum hordeolum
From the official ICD-10-CM alphabetic index entry “Hordeolum (eyelid) (externum) (recurrent) › internum”. Page updated September 29, 2026.
About coding internum hordeolum
The ICD-10-CM code for internum hordeolum is H00.029 (Hordeolum internum unspecified eye, unspecified eyelid). The official index lists 6 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on H00.029.
Within H00.02, choose H00.029 (unspecified eye, unspecified eyelid) only when documentation doesn't support a more specific option: right upper eyelid (H00.021), right lower eyelid (H00.022), right eye, unspecified eyelid (H00.023), left upper eyelid (H00.024), left lower eyelid (H00.025) and left eye, unspecified eyelid (H00.026).
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.
More specific internum hordeolum codes (official index)
- left H00.026 — Hordeolum internum left eye, unspecified eyelid
- lower H00.025 — Hordeolum internum left lower eyelid
- upper H00.024 — Hordeolum internum left upper eyelid
- right H00.023 — Hordeolum internum right eye, unspecified eyelid
- lower H00.022 — Hordeolum internum right lower eyelid
- upper H00.021 — Hordeolum internum right upper eyelid
Common questions about internum hordeolum ICD-10 codes
What is the ICD-10 code for internum hordeolum?
- H00.029 — Hordeolum internum unspecified eye, unspecified eyelid. More specific codes apply when the documentation supports them: H00.026, H00.025, H00.024, H00.023 and others below.
What is the ICD-10 code for left internum hordeolum?
- H00.026 — Hordeolum internum left eye, unspecified eyelid.
What is the ICD-10 code for right internum hordeolum?
- H00.023 — Hordeolum internum right eye, unspecified eyelid.
Is H00.029 billable?
- Yes. H00.029 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can H00.029 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict H00.029 as a principal diagnosis.
Is H00.029 a CC or MCC?
- No. H00.029 is neither a CC nor an MCC under MS-DRG v44.0.