2026 ICD-10-CM Diagnosis Code H05.9Unspecified disorder of orbit

ICD-10-CM Codes›H00–H59›H00-H05›H05

ICD-10-CM H05.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H05.9 is a billable ICD-10-CM diagnosis code for unspecified disorder of orbit. 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 acute disease of orbit. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H05.9
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified disorder of orbit
Short Description
Unspecified disorder of orbit
Same as the full description in the CMS dataset.
Parent Code
H05
Disorders of orbit

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH05Disorders of orbit
This CodeH05.9Unspecified disorder of orbit

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute disease of orbit
  • Disorder of bony orbit
  • Disorder of orbit proper

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disorder(of)
      • orbit

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 H05.9 to ICD-9-CMHistory

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

ICD-9-CM
376.9 Orbital disorder NOS
Exact Match The mapping is direct, with no qualifiers.

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 H05.9Overview

Is H05.9 (Disorders of orbit) a billable code?

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

What MS-DRG does H05.9 group to?

When unspecified disorder of orbit 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 H05.9?

Under the General Equivalence Mappings, unspecified disorder of orbit converts to ICD-9-CM 376.9 (orbital disorder NOS). The mapping is a direct match.

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.