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S84.20XD vs S84.22XD

S84.20XD (Injury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounter) compared with S84.22XD (Injury of cutaneous sensory nerve at lower leg level, left leg, subsequent encounter), from the official CMS tabular data.

Summary

These codes name the same condition on opposite sides of the body, so the documented side decides which one applies.

MedCoder-derived
What is different?

Title wording.The titles differ in one word, “unspecified” (S84.20XD) versus “left” (S84.22XD): S84.20XD is “Injury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounter”; S84.22XD is “Injury of cutaneous sensory nerve at lower leg level, left leg, subsequent encounter”.

Registry fact

Can these codes be reported together?

One side per condition.S84.20XD and S84.22XD name the same condition on opposite sides of the body. Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

MedCoder-derivedGuide: Laterality coding

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code.

Official rule

Is there an Excludes2 relationship?

None.Neither entry carries an Excludes2 note that names the other code. S84.20XD carries 5 Excludes2 notes and S84.22XD carries 5 Excludes2 notes covering other codes; the side-by-side table quotes them.

Official rule

Is one more specific?

Yes.S84.22XD’s title names the condition; S84.20XD’s title is the unspecified form (“Injury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounter”).

MedCoder-derivedGuide: Other vs unspecified (NEC vs NOS)

Is one a parent or header code?

No.Both are billable codes, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

Yes.Same condition, opposite side. S84.20XD and S84.22XD name the same condition on opposite sides of the body.

MedCoder-derivedGuide: Laterality coding

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule.

Can these codes be reported together?

Review

Laterality relationship

S84.20XD
Unspecified
Injury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounter
↔
S84.22XD
Left
Injury of cutaneous sensory nerve at lower leg level, left leg, subsequent encounter

What we found

Same condition, opposite side.S84.20XD and S84.22XD name the same condition on opposite sides of the body.

Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

What to review

Report the side the documentation names. Where the code set provides a bilateral code and both sides are documented, use it instead of the pair.

Guide: Laterality codingCheck these on a claim

Why it matters

These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.

Source / rule

ICD-10-CM tabular list (laterality variant derived from the code title)

Side by side

S84.20XDInjury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounterS84.22XDInjury of cutaneous sensory nerve at lower leg level, left leg, subsequent encounter
Billing statusBillableBillable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionInjury of cutaneous sensory nerve at lower leg level, unspecified leg, subsequent encounter is a billable ICD-10-CM diagnosis code (S84.20XD).Injury of cutaneous sensory nerve at lower leg level, left leg, subsequent encounter is a billable ICD-10-CM diagnosis code (S84.22XD).
7th characterThe appropriate 7th character is to be added to each code from category S84The appropriate 7th character is to be added to each code from category S84
Excludes2
injury of nerves at ankle and foot level (S94.-)
burns and corrosions (T20-T32)
frostbite (T33-T34)
injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
insect bite or sting, venomous (T63.4)
injury of nerves at ankle and foot level (S94.-)
burns and corrosions (T20-T32)
frostbite (T33-T34)
injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
insect bite or sting, venomous (T63.4)
Code also
any associated open wound (S81.-)
any associated open wound (S81.-)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

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Derived from the official CMS ICD-10-CM tabular data (FY2026). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources