2026 ICD-10-CM Diagnosis Code H50.631Inferior rectus muscle entrapment, right eye

ICD-10-CM Codes›H00–H59›H49-H52›H50

ICD-10-CM H50.631
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H50.631 is a billable ICD-10-CM diagnosis code for inferior rectus muscle entrapment, 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 entrapment of extraocular muscle of right eye. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Strabismus.

Code Identity

ICD-10-CM Code
H50.631
Billable Status
Yes — Valid for Submission
Code Describes
Inferior rectus muscle entrapment, right eye
Short Description
Inferior rectus muscle entrapment, right eye
Same as the full description in the CMS dataset.
Parent Code
H50.63
Inferior rectus muscle entrapment

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH49-H52Disorders of ocular muscles, binocular movement, accommodation and refraction
CategoryH50Other strabismus
This CodeH50.631Inferior rectus muscle entrapment, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Entrapment of extraocular muscle of right eye
  • Entrapment of inferior rectus muscle
  • Entrapment of inferior rectus muscle of right eye

Clinical ClassificationClinical

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

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

Code History & ChangesHistory

Replacement H50.631 replaces the following previously assigned code(s):

  • H50.69 - Other mechanical strabismus
FY 2024AddedAdded to the ICD-10-CM code setEffective October 1, 2023.
FY 2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About H50.631Overview

Is H50.631 (Inferior rectus muscle entrapment) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report inferior rectus muscle entrapment, right eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does H50.631 group to?

When inferior rectus muscle entrapment, 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.

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.