2027 ICD-10-CM Diagnosis Code H52.212Irregular astigmatism, left eye

ICD-10-CM Codes›H00–H59›H49-H52›H52

ICD-10-CM H52.212
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

H52.212 is a billable ICD-10-CM diagnosis code for irregular astigmatism, left eye. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 124 through 125. Coders also document this condition as astigmatism of left eye following operative procedure. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Refractive error.

Code Identity

ICD-10-CM Code
H52.212
Billable Status
Yes — Valid for Submission
Code Describes
Irregular astigmatism, left eye
Short Description
Irregular astigmatism, left eye
Same as the full description in the CMS dataset.
Parent Code
H52.21
Irregular 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 CodeH52.212Irregular astigmatism, left eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Astigmatism of left eye following operative procedure
  • Irregular astigmatism
  • Irregular astigmatism of left eye
  • Irregular astigmatism of left eye following operative procedure
  • Postoperative irregular astigmatism

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to H52.212: its own notes plus those printed at block H49-H52 and Chapter 7. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block H49-H52 Disorders of ocular muscles, binocular movement, accommodation and refraction applies to 150 codes
  • nystagmus and other irregular eye movements (H55)
From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • diabetes mellitus related eye conditions (E09.3-, E10.3-, E11.3-, E13.3-)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury (trauma) of eye and orbit (S05.-)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • syphilis related eye disorders (A50.01, A50.3-, A51.43, A52.71)

Notes

General instructions on how these codes are used.

From Chapter 7 (H00-H59) Diseases of the eye and adnexa applies to 2,677 codes
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Astigmatism

    unequal or irregular curvature of the cornea (corneal astigmatism) and/or the eye lens (lenticular astigmatism) resulting in refractive error.

Patient EducationClinical

Refractive Errors

The cornea and lens of your eye bend (refract) light rays to focus them on the retina. Refractive errors happen when the shape of your eye prevents light from focusing correctly on the retina. This causes blurry vision. Changes in the eye's shape affect how light rays bend and focus, leading to vision problems.

The full article covers:

  • What are refractive errors?
  • What causes refractive errors?
  • What are common refractive errors?
  • Who is at risk for refractive errors?
  • What are the symptoms of refractive errors?
  • How are refractive errors diagnosed?
  • How are refractive errors treated?

Read the full article at MedlinePlus

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

Convert H52.212 to ICD-9-CMHistory

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

ICD-9-CM
367.22 Irregular 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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About H52.212Overview

What is the ICD-10 code for irregular astigmatism, left eye?

The ICD-10-CM code for irregular astigmatism, left eye is H52.212 (sometimes written as H52212). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is H52.212 (Irregular astigmatism) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report irregular astigmatism, left eye on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does H52.212 group to?

When irregular astigmatism, left eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 125, 124, with relative weights from 0.7699 to 1.2470 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of H52.212?

Under the General Equivalence Mappings, irregular astigmatism, left eye converts to ICD-9-CM 367.22 (irregular astigmatism). The mapping is approximate, so confirm the match fits the documentation.