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H20.042

✓ Billable

Secondary noninfectious iridocyclitis, left eye

Diseases of the eye and adnexa (H00-H59)

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❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

H20.0
  • • iridocyclitis, iritis, uveitis (due to) (in) diabetes mellitus (E08-E13 with .39)
  • • iridocyclitis, iritis, uveitis (due to) (in) diphtheria (A36.89)
  • • iridocyclitis, iritis, uveitis (due to) (in) gonococcal (A54.32)
  • • iridocyclitis, iritis, uveitis (due to) (in) herpes (simplex) (B00.51)
  • • iridocyclitis, iritis, uveitis (due to) (in) herpes zoster (B02.32)
  • • iridocyclitis, iritis, uveitis (due to) (in) late congenital syphilis (A50.39)
  • • iridocyclitis, iritis, uveitis (due to) (in) late syphilis (A52.71)
  • • iridocyclitis, iritis, uveitis (due to) (in) sarcoidosis (D86.83)
  • • iridocyclitis, iritis, uveitis (due to) (in) syphilis (A51.43)
  • • iridocyclitis, iritis, uveitis (due to) (in) toxoplasmosis (B58.09)
  • • iridocyclitis, iritis, uveitis (due to) (in) tuberculosis (A18.54)

Clinical Description

ICD-10-CM code H20.042 represents secondary noninfectious iridocyclitis, left eye. This code falls under the Diseases of the eye and adnexa (H00-H59) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.

This is a 7-character code at the 6th level of specificity. This is the most specific code available in this subcategory. Coders should note that H20.042 has 11 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code H20.042?

ICD-10-CM code H20.042 is "Secondary noninfectious iridocyclitis, left eye". It belongs to the category: Diseases of the eye and adnexa (H00-H59).

Is H20.042 a billable ICD-10 code?

Yes, H20.042 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

What codes are excluded with H20.042?

H20.042 has 11 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Related Codes in H20.04

Other codes in the same category that may be relevant for differential coding:

H20.041Secondary noninfectious iridocyclitis, right eyeH20.043Secondary noninfectious iridocyclitis, bilateralH20.049Secondary noninfectious iridocyclitis, unspecified eye

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Code Information

CodeH20.042
BillableYes
ParentH20.04
CategoryDiseases of the eye and adnexa (H00-H59)
Excludes111 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)