2026 ICD-10-CM Diagnosis Code H27.121Anterior dislocation of lens, right eye

ICD-10-CM Codes›H00–H59›H25-H28›H27

ICD-10-CM H27.121
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H27.121 is a billable ICD-10-CM diagnosis code for anterior dislocation of lens, right 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 dislocation of lens. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cataract and other lens disorders.

Code Identity

ICD-10-CM Code
H27.121
Billable Status
Yes — Valid for Submission
Code Describes
Anterior dislocation of lens, right eye
Short Description
Anterior dislocation of lens, right eye
Same as the full description in the CMS dataset.
Parent Code
H27.12
Anterior dislocation of lens

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH25-H28Disorders of lens
CategoryH27Other disorders of lens
This CodeH27.121Anterior dislocation of lens, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Anterior dislocation of lens
  • Anterior dislocation of lens of right eye

Clinical ClassificationClinical

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

CCSR EYE002
Cataract and other lens disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

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Read the full article at MedlinePlus

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

Convert H27.121 to ICD-9-CMHistory

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

ICD-9-CM
379.33 Ant dislocation of lens
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 H27.121Overview

Is H27.121 (Anterior dislocation of lens) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report anterior dislocation of lens, right eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H27.121 group to?

When anterior dislocation of lens, right 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 H27.121?

Under the General Equivalence Mappings, anterior dislocation of lens, right eye converts to ICD-9-CM 379.33 (ant dislocation of lens). 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.