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ICD-10-CM 2027 diagnosis code

H52.20Unspecified astigmatism

Not billable — use a more specific code

H52.20 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About H52.20

H52.20 is the ICD-10-CM diagnosis code for unspecified astigmatism. It belongs to category H52 (disorders of refraction and accommodation), block H49-H52 (disorders of ocular muscles, binocular movement, accommodation and refraction) and chapter 7 (diseases of the eye and adnexa). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within H52.2, choose H52.20 (Unspecified astigmatism) only when documentation doesn't support a more specific option: irregular astigmatism (H52.21) and regular astigmatism (H52.22).

To report this condition, pick the subcode that matches the documentation: H52.201 (right eye), H52.202 (left eye), H52.203 (bilateral) and H52.209 (unspecified eye).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under H52.20

Notes that apply from higher levels

Instructions written at a parent level also apply to H52.20.

Broader instructions also apply from H49-H52 Disorders of ocular muscles, binocular movement, accommodation and refraction and Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to H52.20.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about H52.20

Is H52.20 billable?

No. H52.20 is a header code. Report one of its more specific subcodes instead.