2026 ICD-10-CM Diagnosis Code H21.519Anterior synechiae (iris), unspecified eye
ICD-10-CM Codes›H00–H59›H15-H22›H21
- Billable — Valid for Submission
- Not Chronic
H21.519 is a billable ICD-10-CM diagnosis code for anterior synechiae (iris), unspecified 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 anterior synechiae. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified eye disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anterior synechiae
- Focal anterior synechiae of iris
- Peripheral anterior synechiae in inferior quadrant of angle
- Peripheral anterior synechiae in nasal quadrant of angle
- Peripheral anterior synechiae in superior quadrant of angle
- Peripheral anterior synechiae in temporal quadrant of angle
- Secondary angle-closure glaucoma - synechial
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 H21.519 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About H21.519Overview
Is H21.519 (Anterior synechiae (iris)) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anterior synechiae (iris), unspecified eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does H21.519 group to?
When anterior synechiae (iris), unspecified 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 H21.519?
Under the General Equivalence Mappings, anterior synechiae (iris), unspecified eye converts to ICD-9-CM 364.72 (anterior synechiae). 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.
