Non-Billable / Non-Specific Code
ICD-10-CM H10.21 is the diagnosis code for Acute toxic conjunctivitis. This code falls under the section "Disorders of conjunctiva" within Chapter 7 — Diseases of the eye and adnexa (H00-H59). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as H10.21. They are mutually exclusive:
Understanding where H10.21 sits in the ICD-10-CM classification helps ensure proper coding:
No, H10.21 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
H10.21 is the ICD-10-CM diagnosis code for "Acute toxic conjunctivitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of H10.21 is H10.2 ("Other acute conjunctivitis"). H10.21 provides a more specific classification within this category.
H10.21 is located in Section H10-H11 — "Disorders of conjunctiva" within Chapter 7 of the ICD-10-CM Tabular List.
H10.21 has 4 sub-code(s) that provide more specific detail: H10.211, H10.212, H10.213, H10.219.
Use H10.21 when the patients documented diagnosis matches "Acute toxic conjunctivitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Acute toxic conjunctivitis is H10.21.
No, H10.21 is non-billable. Use a more specific sub-code for primary diagnosis billing.
H10.21 is in Chapter 7 of the ICD-10-CM Tabular List.
Type 1 Excludes for H10.21 include: burn and corrosion of eye and adnexa (T26.-).
Yes, H10.21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.