T23.41 is the authoritative medical code for Corrosion of unspecified degree of thumb nail. This classification is used in medical billing and clinical recording to specify the clinical criteria for corrosion of unspecified degree of thumb nail (ICD-10-CM T23.41), 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 unspecified degree of thumb nail is a non-billable ICD-10-CM category code T23.41. A more specific billable subcode must be selected for claims submission. Includes: burns and corrosions of first degree erythema; burns and corrosions of second degree blistersepidermal loss; burns and corrosions of third degree deep necrosis of underlying tissue full- thickness skin loss. Code first: T51-T65 to identify chemical and intent. Use additional code: external cause code to identify place Y92; code from category T31 or T32 to identify extent of body surface involved. 7th character: The appropriate 7th character is to be added to each code from category T23.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T23.41 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- burns and corrosions of first degree erythema
- burns and corrosions of second degree blistersepidermal loss
- burns and corrosions of third degree deep necrosis of underlying tissue full- thickness skin loss
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 place Y92
- code from category T31 or T32 to identify extent of body surface involved
Frequently Asked Questions (FAQ) & Clinical Guidance
Can T23.41 be billed directly?
No. T23.41 (Corrosion of unspecified degree of thumb nail) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Does T23.41 require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T23.
Does T23.41 need to be sequenced after another code?
Yes. Code first: (T51-T65) to identify chemical and intent.
Is an additional code needed with T23.41?
Use additional code(s) to specify: external cause code to identify place (Y92); code from category T31 or T32 to identify extent of body surface involved.
Codes in This Family (40)
Official ICD-10-CM classifications in the same code family as T23.41, with their registry titles.
- T23 — Burn and corrosion of wrist and hand
- T23.0 — Burn of unspecified degree of wrist and hand
- T23.00 — Burn of unspecified degree of hand, unspecified site
- T23.001 — Burn of unspecified degree of right hand, unspecified site
- T23.001A — Burn of unspecified degree of right hand, unspecified site, initial encounter
- T23.001D — Burn of unspecified degree of right hand, unspecified site, subsequent encounter
- T23.001S — Burn of unspecified degree of right hand, unspecified site, sequela
- T23.002 — Burn of unspecified degree of left hand, unspecified site
- T23.002A — Burn of unspecified degree of left hand, unspecified site, initial encounter
- T23.002D — Burn of unspecified degree of left hand, unspecified site, subsequent encounter
- T23.002S — Burn of unspecified degree of left hand, unspecified site, sequela
- T23.009 — Burn of unspecified degree of unspecified hand, unspecified site
- T23.009A — Burn of unspecified degree of unspecified hand, unspecified site, initial encounter
- T23.009D — Burn of unspecified degree of unspecified hand, unspecified site, subsequent encounter
- T23.009S — Burn of unspecified degree of unspecified hand, unspecified site, sequela
- T23.01 — Burn of unspecified degree of thumb (nail)
- T23.011 — Burn of unspecified degree of right thumb (nail)
- T23.011A — Burn of unspecified degree of right thumb (nail), initial encounter
- T23.011D — Burn of unspecified degree of right thumb (nail), subsequent encounter
- T23.011S — Burn of unspecified degree of right thumb (nail), sequela
- T23.012 — Burn of unspecified degree of left thumb (nail)
- T23.012A — Burn of unspecified degree of left thumb (nail), initial encounter
- T23.012D — Burn of unspecified degree of left thumb (nail), subsequent encounter
- T23.012S — Burn of unspecified degree of left thumb (nail), sequela
- T23.019 — Burn of unspecified degree of unspecified thumb (nail)
- T23.019A — Burn of unspecified degree of unspecified thumb (nail), initial encounter
- T23.019D — Burn of unspecified degree of unspecified thumb (nail), subsequent encounter
- T23.019S — Burn of unspecified degree of unspecified thumb (nail), sequela
- T23.02 — Burn of unspecified degree of single finger (nail) except thumb
- T23.021 — Burn of unspecified degree of single right finger (nail) except thumb
- T23.021A — Burn of unspecified degree of single right finger (nail) except thumb, initial encounter
- T23.021D — Burn of unspecified degree of single right finger (nail) except thumb, subsequent encounter
- T23.021S — Burn of unspecified degree of single right finger (nail) except thumb, sequela
- T23.022 — Burn of unspecified degree of single left finger (nail) except thumb
- T23.022A — Burn of unspecified degree of single left finger (nail) except thumb, initial encounter
- T23.022D — Burn of unspecified degree of single left finger (nail) except thumb, subsequent encounter
- T23.022S — Burn of unspecified degree of single left finger (nail) except thumb, sequela
- T23.029 — Burn of unspecified degree of unspecified single finger (nail) except thumb
- T23.029A — Burn of unspecified degree of unspecified single finger (nail) except thumb, initial encounter
- T23.029D — Burn of unspecified degree of unspecified single finger (nail) except thumb, subsequent encounter
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:
ICD Code T20.41
Corrosion of unspecified degree of ear [any part, except ear drum]