In simple words: This code describes inflammation of the parts of the eye that control pupil size and focusing.It's used when doctors can't specify the exact type of inflammation.

H20.9 in the ICD-10-CM classification system refers to unspecified iridocyclitis.Iridocyclitis is an inflammation of the iris and ciliary body,structures within the eye responsible for controlling pupil size and focusing.This code is used when the specific type of iridocyclitis cannot be determined or is not documented.

Example 1: A patient presents with eye pain, blurred vision, and photophobia (light sensitivity). Examination reveals inflammation of the iris and ciliary body, but the underlying cause is undetermined.Code H20.9 is assigned., A patient with a history of autoimmune disease develops iridocyclitis. While the autoimmune condition is likely the cause, the specific type of iridocyclitis cannot be definitively identified, therefore H20.9 is utilized., A patient undergoes eye surgery, and post-operative inflammation occurs affecting both the iris and ciliary body.If the cause is related to the surgery and not a separate diagnosis, H59.8 (other postprocedural disorders of eye and adnexa) would be more appropriate than H20.9.

Detailed ophthalmologic examination report including slit-lamp biomicroscopy, visual acuity measurements, intraocular pressure measurement.Documentation should clarify the presence of inflammation, its location (iris and/or ciliary body), and any associated symptoms.If a cause is known, that should be clearly documented.

** H20.9 is a nonspecific code and should only be used when a more precise diagnosis is not possible.Appropriate documentation is crucial for proper coding and reimbursement.