2021 ICD-10-CM Code H52.21

Irregular astigmatism

Version 2021

Not Valid for Submission

H52.21 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of irregular astigmatism. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:H52.21
Short Description:Irregular astigmatism
Long Description:Irregular astigmatism

Code Classification

Specific Coding for Irregular astigmatism

Non-specific codes like H52.21 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for irregular astigmatism:

  • BILLABLE CODE - Use H52.211 for Irregular astigmatism, right eye
  • BILLABLE CODE - Use H52.212 for Irregular astigmatism, left eye
  • BILLABLE CODE - Use H52.213 for Irregular astigmatism, bilateral
  • BILLABLE CODE - Use H52.219 for Irregular astigmatism, unspecified eye

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code H52.21 are found in the index:

Information for Patients


Refractive Errors

Also called: Farsightedness, Hyperopia, Myopia, Nearsightedness

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.

Four common refractive errors are

The most common symptom is blurred vision. Other symptoms may include double vision, haziness, glare or halos around bright lights, squinting, headaches, or eye strain.

Glasses or contact lenses can usually correct refractive errors. Laser eye surgery may also be a possibility.

NIH: National Eye Institute


[Learn More in MedlinePlus]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)