H20.0 is the authoritative medical code for Acute and subacute iridocyclitis. This classification is used in medical billing and clinical recording to specify the clinical criteria for acute and subacute iridocyclitis (ICD-10-CM H20.0), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Official Registry Overview & Definition
Acute and subacute iridocyclitis is a non-billable ICD-10-CM category code H20.0. A more specific billable subcode must be selected for claims submission. Inclusion terms: Acute anterior uveitis; Acute cyclitis; Acute iritis; Subacute anterior uveitis; Subacute cyclitis; Subacute iritis. Excludes1 (not coded here): 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.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for H20.0 in the official ICD-10-CM tabular list.
Inclusion Terms
Alternative terms the tabular list files under this code.
- Acute anterior uveitis
- Acute cyclitis
- Acute iritis
- Subacute anterior uveitis
- Subacute cyclitis
- Subacute iritis
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- 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
Frequently Asked Questions (FAQ) & Clinical Guidance
Can H20.0 be billed directly?
No. H20.0 (Acute and subacute iridocyclitis) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
What can't be coded together with H20.0?
Per Excludes1 instructions, H20.0 must not be reported with: 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).
What conditions are included under H20.0?
Acute and subacute iridocyclitis includes: Acute anterior uveitis; Acute cyclitis; Acute iritis; Subacute anterior uveitis; Subacute cyclitis.
Codes in This Family (20)
Official ICD-10-CM classifications in the same code family as H20.0, with their registry titles.
- H20.011 — Primary iridocyclitis, right eye
- H20.012 — Primary iridocyclitis, left eye
- H20.013 — Primary iridocyclitis, bilateral
- H20.019 — Primary iridocyclitis, unspecified eye
- H20.021 — Recurrent acute iridocyclitis, right eye
- H20.022 — Recurrent acute iridocyclitis, left eye
- H20.023 — Recurrent acute iridocyclitis, bilateral
- H20.029 — Recurrent acute iridocyclitis, unspecified eye
- H20.031 — Secondary infectious iridocyclitis, right eye
- H20.032 — Secondary infectious iridocyclitis, left eye
- H20.033 — Secondary infectious iridocyclitis, bilateral
- H20.039 — Secondary infectious iridocyclitis, unspecified eye
- H20.041 — Secondary noninfectious iridocyclitis, right eye
- H20.042 — Secondary noninfectious iridocyclitis, left eye
- H20.043 — Secondary noninfectious iridocyclitis, bilateral
- H20.049 — Secondary noninfectious iridocyclitis, unspecified eye
- H20.051 — Hypopyon, right eye
- H20.052 — Hypopyon, left eye
- H20.053 — Hypopyon, bilateral
- H20.059 — Hypopyon, unspecified eye
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: