2026 ICD-10-CM Diagnosis Code H05.819Cyst of unspecified orbit

ICD-10-CM Codes›H00–H59›H00-H05›H05

ICD-10-CM H05.819
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H05.819 is a billable ICD-10-CM diagnosis code for cyst of unspecified 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Oculofacial plastics and orbital conditions.

Code Identity

ICD-10-CM Code
H05.819
Billable Status
Yes — Valid for Submission
Code Describes
Cyst of unspecified orbit
Short Description
Cyst of unspecified orbit
Same as the full description in the CMS dataset.
Parent Code
H05.81
Cyst of orbit

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH00-H05Disorders of eyelid, lacrimal system and orbit
CategoryH05Disorders of orbit
This CodeH05.819Cyst of unspecified orbit

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired cyst of orbit
  • Epithelial cyst of orbit
  • Hemorrhagic cyst of orbit
  • Hydatic cyst of orbit
  • Infection of orbit
  • Mucocele of orbit
  • Odontogenic cyst of orbit
  • Orbital cyst
  • Parasitic cyst of orbit
  • Parasitic infestation of orbit
  • Respiratory epithelial cyst 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

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 H05.819 to ICD-9-CMHistory

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

ICD-9-CM
376.81 Orbital cysts
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 H05.819Overview

Is H05.819 (Cyst of orbit) a billable code?

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

What MS-DRG does H05.819 group to?

When cyst of unspecified 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 H05.819?

Under the General Equivalence Mappings, cyst of unspecified orbit converts to ICD-9-CM 376.81 (orbital cysts). 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.