T28.5 is the authoritative medical code for Corrosion of mouth and pharynx. This classification is used in medical billing and clinical recording to specify the clinical criteria for corrosion of mouth and pharynx (ICD-10-CM T28.5), 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
Corrosion of mouth and pharynx is a non-billable ICD-10-CM category code T28.5. A more specific billable subcode must be selected for claims submission. Code first: T51-T65 to identify chemical and intent. Use additional code: external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98); external cause code to identify place Y92. 7th character: The appropriate 7th character is to be added to each code from category T28.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T28.5 in the official ICD-10-CM tabular list.
Code First
Underlying conditions that must be sequenced before this code.
- T51-T65 to identify chemical and intent
Use Additional Code
Supplementary codes the tabular list directs you to add.
- external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98)
- external cause code to identify place Y92
Frequently Asked Questions (FAQ) & Clinical Guidance
Can T28.5 be billed directly?
No. T28.5 (Corrosion of mouth and pharynx) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does T28.5 require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T28.
Does T28.5 need to be sequenced after another code?
Yes. Code first: (T51-T65) to identify chemical and intent.
Is an additional code needed with T28.5?
Use additional code(s) to specify: external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98); external cause code to identify place (Y92).
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T28.5 in its code family, with their registry titles.
- T28.5XXA — Corrosion of mouth and pharynx, initial encounter
- T28.5XXD — Corrosion of mouth and pharynx, subsequent encounter
- T28.5XXS — Corrosion of mouth and pharynx, sequela
Indexed Clinical Terms (7)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), internal organ (s), mouth
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), internal organ (s), pharynx
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), mouth
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), pharynx
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), throat (meaning pharynx)
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), tongue
- Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), tonsil (s)