S91.21 ICD-10-CA code: Open wound of toe(s) with damage to nail, complicated
S91.21 is the ICD-10-CA code for “Open wound of toe(s) with damage to nail, complicated” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
S91.21Open wound of toe(s) with damage to nail, complicated
Short description: Opn wnd toe(s) w damage nail compl
ICD-10-CA · Canada · Also written S9121
Notes for S91.21
As CIHI prints them, with any note S91.21 takes from the headings above it.
Includes
- Wounds with mention of delayed healing, delayed treatment, foreign body or major infection
- Laceration, Puncture wound of ankle and footFrom S91 Open wound of ankle and foot
Excludes
Conditions classified elsewhere.
- Traumatic amputation of ankle and foot (S98.-)From S91 Open wound of ankle and foot
- Bilateral involvement of ankle and foot (T00-T07)burns and corrosions (T20-T32)fracture of ankle and malleolus (S82.-)frostbite (T33-T35)injuries of leg, level unspecified (T12-T13)insect bite or sting, venomous (T63.4)From S90-S99 Injuries to the ankle and foot
- Birth trauma (P10-P15)obstetric trauma (O70-O71)From Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
Note
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to multiple or unspecified body regions as well as poisoning and certain other consequences of external causes.Where multiple sites of injury are specified in the titles, the word "with" indicates involvement of both sites, and the word "and" indicates involvement of either or both sites.The principle of multiple coding of injuries should be followed wherever possible.Combination categories for multiple injuries is provided for use when there are insufficient detail as to the nature of the individual conditions, or for primary tabulation purposes when it is more convenient to record single code; otherwise, the component injuries should be coded separately.Reference should also be made to the coding rules and guidelines.The blocks of the S-section as well as (T00-T14 and T90-T98) contain injuries at the three-character level classified by type as follows:Superficial injury including:abrasionblister (nonthermal)contusion, including bruise and haematomainjury from superficial foreign body (splinter) without major open woundinsect bite (nonvenomous)Open wound including:animal bitecutlacerationpuncture wound:• NOS• with (penetrating) foreign bodyFracture including:Fracture:closed: comminuted, depressed, elevated, fissured, greenstick, impacted, linear, simple, slipped epiphysis, spiral — with or without delayed healingdislocateddisplacedFracture:open: compound, infected, missile, puncture, with foreign body — with or without delayed healingExcludes:malunion of fracture (M84.0)nonunion of fracture [pseudoarthrosis] (M84.1)pathological fracture (M84.4):• with osteoporosis (M80.-)stress fracture (M84.3)Dislocation, sprain and strain including:avulsion, laceration, sprain, strain, traumatic: haemarthosis, rupture, subluxation, tear of cartilage, joint (capsule), ligamentInjury to nerves and spinal cord including:complete or incomplete lesion of spinal cordlesion incontinuity of nerves and spinal cordtraumatic:• division of nerve• haematomyelia• paralysis (transient)• paraplegia• quadriplegiaInjury to blood vessels includingavulsion, cut, laceration, traumatic: aneurysm or fistula (arteriovenous), arterial haematoma, rupture of blood vesselsInjury of muscle, fascia and tendon including:avulsion, cut, laceration, strain, traumatic rupture of muscle, fascia and tendonCrushing InjuryTraumatic amputationInjury to internal organs including:blast injuries, bruise, concussion injuries, crushing, laceration, traumatic: haematoma, puncture, rupture, tear of internal organsOther and unspecified injuriesFrom Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
Where S91.21 sits
- 1ChapterChapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98)
- 2Block S90-S99Injuries to the ankle and foot
- 3Category S91Open wound of ankle and foot
- 4Subcategory S91.2Open wound of toe(s) with damage to nail
- 5Valid code S91.21Open wound of toe(s) with damage to nail, complicated
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code S91.21 mean?
S91.21 is the ICD-10-CA code for “Open wound of toe(s) with damage to nail, complicated” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is S91.21 in ICD-10-CA?
S91.21 sits under S91.2 Open wound of toe(s) with damage to nail, within S91 Open wound of ankle and foot, within S90-S99 Injuries to the ankle and foot, within Chapter 19: Injury, poisoning and certain other consequences of external causes (S00-T98).
What coding notes apply to S91.21?
ICD-10-CA lists Includes, Excludes, Note notes for S91.21, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.