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S90.42

⚠ Non-billable (Header)

Blister (nonthermal) of toe

Injury, poisoning and certain other consequences of external causes (S00-T88)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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✓ No additional coding notes for S90.42

Child Codes (6)

S90.421Blister (nonthermal), right great toeS90.422Blister (nonthermal), left great toeS90.423Blister (nonthermal), unspecified great toeS90.424Blister (nonthermal), right lesser toe(s)S90.425Blister (nonthermal), left lesser toe(s)S90.426Blister (nonthermal), unspecified lesser toe(s)

Clinical Description

ICD-10-CM code S90.42 represents blister (nonthermal) of toe. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 6-character code at the 5th level of specificity. There are 6 more specific child codes under S90.42.

Frequently Asked Questions

What is ICD-10 code S90.42?

ICD-10-CM code S90.42 is "Blister (nonthermal) of toe". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).

Is S90.42 a billable ICD-10 code?

No, S90.42 is a non-billable header code. A more specific child code must be used for billing.

Related Codes in S90.4

Other codes in the same category that may be relevant for differential coding:

S90.41Abrasion of toeS90.44External constriction of toeS90.45Superficial foreign body of toeS90.46Insect bite (nonvenomous) of toeS90.47Other superficial bite of toe

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Code Information

CodeS90.42
BillableNo — Header code
ParentS90.4
CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)
Excludes10 rule(s)
Excludes20 note(s)
Child codes6

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)