2026 ICD-10-CM Diagnosis Code H50.312Intermittent monocular esotropia, left eye

ICD-10-CM Codes›H00–H59›H49-H52›H50

ICD-10-CM H50.312
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H50.312 is a billable ICD-10-CM diagnosis code for intermittent monocular esotropia, 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 intermittent esotropia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Strabismus.

Code Identity

ICD-10-CM Code
H50.312
Billable Status
Yes — Valid for Submission
Code Describes
Intermittent monocular esotropia, left eye
Short Description
Intermittent monocular esotropia, left eye
Same as the full description in the CMS dataset.
Parent Code
H50.31
Intermittent monocular esotropia

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH49-H52Disorders of ocular muscles, binocular movement, accommodation and refraction
CategoryH50Other strabismus
This CodeH50.312Intermittent monocular esotropia, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Intermittent esotropia
  • Intermittent esotropia of left eye
  • Intermittent monocular esotropia
  • Intermittent monocular esotropia of left eye
  • Intermittent tropia
  • Monocular esotropia of left eye

Clinical ClassificationClinical

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

CCSR EYE007
Strabismus
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Eye Movement Disorders

When you look at an object, you're using several muscles to move both eyes to focus on it. If you have a problem with the muscles, the eyes don't work properly.

Read the full article at MedlinePlus

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Convert H50.312 to ICD-9-CMHistory

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

ICD-9-CM
378.21 Intermit monoc esotropia
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 H50.312Overview

Is H50.312 (Intermittent monocular esotropia) a billable code?

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

What MS-DRG does H50.312 group to?

When intermittent monocular esotropia, 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 H50.312?

Under the General Equivalence Mappings, intermittent monocular esotropia, left eye converts to ICD-9-CM 378.21 (intermit monoc esotropia). 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.