2026 ICD-10-CM Diagnosis Code H05.242Constant exophthalmos, left eye

ICD-10-CM Codes›H00–H59›H00-H05›H05

ICD-10-CM H05.242
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H05.242 is a billable ICD-10-CM diagnosis code for constant exophthalmos, left eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H05.242
Billable Status
Yes — Valid for Submission
Code Describes
Constant exophthalmos, left eye
Short Description
Constant exophthalmos, left eye
Same as the full description in the CMS dataset.
Parent Code
H05.24
Constant exophthalmos

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH05Disorders of orbit
This CodeH05.242Constant exophthalmos, left eye

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EYE008
Oculofacial plastics and orbital conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Eye Diseases

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Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert H05.242 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
376.31 Constant exophthalmos
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H05.242Overview

Is H05.242 (Constant exophthalmos) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report constant exophthalmos, left eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H05.242 group to?

When constant exophthalmos, left eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H05.242?

Under the General Equivalence Mappings, constant exophthalmos, left eye converts to ICD-9-CM 376.31 (constant exophthalmos). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.