Skip to content
Dx

ICD-10-CM 2027 diagnosis code

H21.35Exudative cyst of pars plana

Not billable — use a more specific code

H21.35 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About H21.35

H21.35 is the ICD-10-CM diagnosis code for Exudative cyst of pars plana. It belongs to category H21 (other disorders of iris and ciliary body), block H15-H22 (disorders of sclera, cornea, iris and ciliary body) 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 H21.3 (cyst of iris, ciliary body and anterior chamber), H21.35 is specifically for Exudative cyst of pars plana. Related codes cover idiopathic cysts of iris, ciliary body or anterior chamber (H21.30), Exudative cysts of iris or anterior chamber (H21.31), implantation cysts of iris, ciliary body or anterior chamber (H21.32), parasitic cyst of iris, ciliary body or anterior chamber (H21.33) and primary cyst of pars plana (H21.34).

To report this condition, pick the subcode that matches the documentation: H21.351 (right eye), H21.352 (left eye), H21.353 (bilateral) and H21.359 (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 H21.35

Notes that apply from higher levels

Instructions written at a parent level also apply to H21.35.

› From H21.3 Cyst of iris, ciliary body and anterior chamber
Excludes2
› From H21 Other disorders of iris and ciliary body
Excludes2

Broader instructions also apply from Chapter 7: Diseases of the eye and adnexa.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to H21.35.

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 H21.35

Is H21.35 billable?

No. H21.35 is a header code. Report one of its more specific subcodes instead.