2026 ICD-10-CM Diagnosis Code H52.229Regular astigmatism, unspecified eye

ICD-10-CM Codes›H00–H59›H49-H52›H52

ICD-10-CM H52.229
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

H52.229 is a billable ICD-10-CM diagnosis code for regular astigmatism, 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 against-the-rule astigmatism. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Refractive error.

Code Identity

ICD-10-CM Code
H52.229
Billable Status
Yes — Valid for Submission
Code Describes
Regular astigmatism, unspecified eye
Short Description
Regular astigmatism, unspecified eye
Same as the full description in the CMS dataset.
Parent Code
H52.22
Regular astigmatism

Code Classification

ChapterH00–H59Diseases of the eye and adnexa
SectionH49-H52Disorders of ocular muscles, binocular movement, accommodation and refraction
CategoryH52Disorders of refraction and accommodation
This CodeH52.229Regular astigmatism, unspecified eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Against-the-rule astigmatism
  • Oblique astigmatism
  • Regular astigmatism
  • Regular astigmatism - corneal
  • Regular astigmatism - lenticular
  • With-the-rule astigmatism

Clinical ClassificationClinical

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

CCSR EYE009
Refractive error
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Refractive Errors

The cornea and lens of your eye helps you focus. Refractive errors are vision problems that happen when the shape of the eye keeps you from focusing well. The cause could be the length of the eyeball (longer or shorter), changes in the shape of the cornea, or aging of the lens.

Read the full article at MedlinePlus

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

Convert H52.229 to ICD-9-CMHistory

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

ICD-9-CM
367.21 Regular astigmatism
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 H52.229Overview

Is H52.229 (Regular astigmatism) a billable code?

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

What MS-DRG does H52.229 group to?

When regular astigmatism, 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 H52.229?

Under the General Equivalence Mappings, regular astigmatism, unspecified eye converts to ICD-9-CM 367.21 (regular astigmatism). 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.