Alphabetic Index FY2027

H21.33

Parasitic cyst of iris, ciliary body or anterior chamber

FY2027Chapter 7: Diseases of the eye and adnexa/H15–H22 Disorders of sclera, cornea, iris and ciliary body

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

H21.33 is a non-billable ICD-10-CM code header for parasitic cyst of iris, ciliary body or anterior chamber. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are H21.331 Parasitic cyst of iris, ciliary body or anterior chamber, right eye; H21.332 Parasitic cyst of iris, ciliary body or anterior chamber, left eye; H21.333 Parasitic cyst of iris, ciliary body or anterior chamber, bilateral and H21.339 Parasitic cyst of iris, ciliary body or anterior chamber, unspecified eye. Its coding notes include 13 Excludes2 entries.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from H21.3 Cyst of iris, ciliary body and anterior chamber
Inherited from H21 Other disorders of iris and ciliary body
Also from chapter/block level (11 notes)
Inherited from Chapter 7 Diseases of the eye and adnexa
  • 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

Also from chapter/block level (1 note)
Inherited from Chapter 7 Diseases of the eye and adnexa
  • Use an external cause code following the code for the eye condition, if applicable, to identify the cause of the eye condition

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 1 entry

More specific codes under H21.33 4