Chorioretinitis is the simultaneous inflammation of the choroid (the thin, vascular, pigmented middle layer of the eye that supplies the outer retina with blood and oxygen) and the retina (the light-sensitive neuroepithelial layer lining the posterior eye). It is classified as a form of posterior uveitis — uveitis that affects the back segment of the eye — and is distinguished from choroiditis alone (choroid inflamed, retina spared) and retinitis alone (retina inflamed, choroid spared). Because the choroid and retina are anatomically adjacent and share vascular supply, inflammation in one layer almost always propagates to the other. chorioretinitis is a vision-threatening condition: active lesions can cause scotomas, photopsia, and permanent visual field loss, particularly when the macula or optic nerve is involved. The most common infectious cause worldwide is toxoplasmosis (Toxoplasma gondii), with other causes including CMV (especially in immunocompromised patients), syphilis, tuberculosis, histoplasmosis, sarcoidosis, and West Nile virus. The classic toxoplasmic lesion appears as a focal white retinitis adjacent to a pigmented chorioretinal scar — often described as “a satellite lesion” — with overlying vitreous haze producing the “headlight in fog” sign on fundoscopy.
“Inflammation of” — the most common medical suffix denoting an inflammatory process
The combining form chorio- derives from Greek chorion, meaning “membrane” or “skin,” which was applied to the vascular coat of the eye due to its thin, membranous quality — the same root used in chorioamnionitis (inflammation of the fetal membranes). The retina gets its name from the Latin rete (“net”), coined by the anatomist Herophilus of Chalcedon (~300 BC) for the net-like pattern of retinal blood vessels visible on fundoscopy. The suffix -itis is a Greek-derived inflammation marker that entered Latin medical vocabulary in the early 19th century (popularized post-1800) and is now appended to virtually any anatomical structure to denote its inflammatory pathology.
🔀 ALIASES / ALTERNATE TERMS
Chorioretinal inflammation(ICD-10 category header term — H30)
Retinochoroiditis(reversed form; same condition — retina inflammation extending to choroid)
Posterior uveitis(broader anatomical classification; chorioretinitis is the most common form)
Ocular toxoplasmosis(most common specific infectious etiology worldwide)
CMV retinitis / CMV chorioretinitis(cytomegalovirus; primarily in HIV/AIDS, transplant patients)
Intravitreal injection of pharmacologic agent (e.g., anti-VEGF, steroid, antiviral)
⚠️ Coding Note: Laterality is mandatory for all H30.0x and H30.1x codes — unspecified eye codes (H30.X09, H30.X19) should only be used when the operative/imaging report truly does not document the eye. For infectious chorioretinitis, ICD-10-CM instructs you to code the underlying organism first (e.g., B58.01 for toxoplasmosis, A52.71 for syphilis) with H32 as the ocular manifestation when applicable — follow the “use additional code” / “code first” notes in the Tabular. On inpatient profee claims, B58.01 (Toxoplasma chorioretinitis) in an HIV-positive patient is a strong MCC/AIDS-defining illness — always ensure the HIV disease (B20) is coded, not just the HIV status (Z21). 67028 (intravitreal injection) is frequently billed alongside 92014 for anti-VEGF or steroid management of posterior uveitis complications; confirm the injection drug with a HCPCS J-code (e.g., J0178 for aflibercept, J2778 for ranibizumab). OCT (92134) and fluorescein angiography (92235) are the two primary diagnostic imaging CPTs for monitoring lesion activity and response to treatment.
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