2026 ICD-10-CM Diagnosis Code H05.402Unspecified enophthalmos, left eye

ICD-10-CM Codes›H00–H59›H00-H05›H05

ICD-10-CM H05.402
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H05.402 is a billable ICD-10-CM diagnosis code for unspecified enophthalmos, 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. Coders also document this condition as enophthalmos of left eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H05.402
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified enophthalmos, left eye
Short Description
Unspecified enophthalmos, left eye
Same as the full description in the CMS dataset.
Parent Code
H05.40
Unspecified enophthalmos

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH05Disorders of orbit
This CodeH05.402Unspecified enophthalmos, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Enophthalmos of 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

Clinical InformationClinical

  • Enophthalmos

    recession of the eyeball into the orbit.

Patient EducationClinical

Eye Diseases

Even if your eyes feel healthy, you could have a problem and not know it. That's why regular eye exams are so important. Refractive errors are the most common type of vision problem that makes it hard to see clearly. But some eye conditions or diseases don't have any symptoms and can lead to a permanent loss of vision.

The full article covers:

  • What diseases can affect the eye?
  • What are the symptoms of eye diseases?
  • Who is more likely to develop eye diseases?
  • What are the treatments for eye diseases?
  • Can eye diseases be prevented?

Read the full article at MedlinePlus

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

Convert H05.402 to ICD-9-CMHistory

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

ICD-9-CM
376.50 Enophthalmos NOS
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 H05.402Overview

Is H05.402 (Unspecified enophthalmos) a billable code?

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

What MS-DRG does H05.402 group to?

When unspecified enophthalmos, 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 H05.402?

Under the General Equivalence Mappings, unspecified enophthalmos, left eye converts to ICD-9-CM 376.50 (enophthalmos NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.