S90.521⚠ Requires 7th Character

Blister (nonthermal), right ankle

⚠ 7th Character Required

The appropriate 7th character is to be added to each code from category S90

This code is not valid for billing without a 7th character. Append one of the following to S90.521:

Ainitial encounterS90.521ADsubsequent encounterS90.521DSsequelaS90.521S

Sub-codes of S90.521(3)

S90.521 is a non-billable header. Select a sub-code to bill.

S90.521ABlister (nonthermal), right ankle, initial encounter✓ BillableS90.521DBlister (nonthermal), right ankle, subsequent encounter✓ BillableS90.521SBlister (nonthermal), right ankle, sequela✓ Billable

Code Hierarchy

┌19Injury, poisoning and certain other consequences of external causes (S00-T88)├S90-S99Injuries to the ankle and foot (S90-S99)├S90Superficial injury of ankle, foot and toes
└S90.521Blister (nonthermal), right ankle

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