ICD code S94.10XD – Injury of medial plantar nerve

Key takeaways

S94.10XD is a billable ICD-10-CM code for injury of the medial plantar nerve, unspecified leg, at a subsequent encounter.

The 7th character D means the patient has finished definitive treatment and is now receiving aftercare.

The FY2026 edition took effect October 1, 2025, so the code is valid for reimbursement this fiscal year.

If the chart names the injured leg, code S94.11XD for the right or S94.12XD for the left.

Practice management software like Pabau puts ICD-10-CM lookup inside the client record, so coders stop switching systems mid-visit.

Quick reference

S94.10XD is a billable, specific ICD-10-CM code valid for reimbursement in fiscal year 2026. The table below gives the at-a-glance detail coders need before selecting it.

What is the medial plantar nerve?

The medial plantar nerve is the larger of the two terminal branches of the tibial nerve. It runs along the medial side of the sole. It supplies sensation to the medial two-thirds of the plantar surface, plus motor innervation to several intrinsic foot muscles.

Injuries to it usually arise from compression, laceration, or traction at the ankle or mid-foot. Sports trauma, crush injuries, and post-surgical complications account for most of them.

In ICD-10-CM, injuries to this nerve sit in the S94 category, which covers nerve injuries at ankle and foot level. S94 belongs to the S90-S99 block for injuries to the ankle and foot. That block is part of the wider S00-T88 injury chapter.

• Common injury mechanisms: crush trauma, laceration from glass or sharp objects, traction from ankle fractures, iatrogenic injury during foot or ankle surgery
• Clinical presentations: numbness or tingling along the medial sole, burning pain with weight-bearing, weakness of toe flexion
• Related condition: medial plantar neuropathy, sometimes described as jogger’s foot in athletes

Code hierarchy and classification

S94.10XD sits at the bottom of a six-level hierarchy in ICD-10-CM. Coders working from the tabular list can follow the path below. The CDC/NCHS ICD-10-CM web tool carries the official year-specific list for verification.

Note the placeholder “X” in position six. ICD-10-CM uses a dummy character so the code reaches the required seven characters. It carries no clinical meaning, and it must be included exactly as shown.

Understanding the 7th character: A, D, and S

The 7th character is the most error-prone element when coding S94.10XD. All three options are available for every code in the S94.1 subcategory. Choosing the wrong one creates a claim that does not match the clinical record, which is a common trigger for medical necessity denials.

When to use S94.10XD versus S94.10XA

Claim rejections often trace back to assigning S94.10XA past the initial treatment phase. Per CMS ICD-10-CM guidance, “A” applies while the patient is receiving active, definitive treatment for the injury.

Once care shifts to follow-up management, the encounter becomes “D.” That covers physical therapy visits, orthotic adjustment, and monitoring appointments. The treating provider’s notes have to show that transition. If the note describes a wound check or a PT session after initial treatment, assign D rather than A.

• Still use A: emergency department visit for the acute injury, initial surgical repair, first specialist evaluation
• Switch to D: follow-up physical therapy, cast or splint changes, wound re-evaluation once healing has begun, neurological monitoring
• Use S: chronic neuropathic pain documented as a sequela of the original nerve injury, long after the injury itself healed

Laterality variants: Unspecified, right, and left leg

ICD-10-CM requires laterality specificity wherever the chart documents it. S94.10XD covers the unspecified leg scenario. If the record identifies which leg is injured, a more specific code is required. Using the unspecified variant when laterality is charted may trigger payer-level code edits.

In practice, most notes for an ankle or foot injury name the affected leg. Query the treating provider before defaulting to the unspecified code. Practices using claims management software with built-in ICD-10-CM lookups can flag unspecified laterality before submission, which cuts rework later.

Laterality and encounter phase are two separate decisions, and together they produce nine codes. The grid below lays out all of them.

Approximate synonyms and alternate descriptions

Clinical documentation often uses different language for the same condition. The terms below all map to S94.10XD when the encounter is a follow-up visit and laterality is unspecified.

• Injury of medial plantar nerve, unspecified leg, subsequent encounter
• Medial plantar nerve injury, follow-up visit, laterality not specified
• Medial plantar neuropathy, subsequent encounter, traumatic origin
• Plantar nerve damage, medial branch, unspecified side, aftercare
• Nerve injury at ankle and foot level, medial plantar, subsequent encounter
• Jogger’s foot, meaning medial plantar nerve compression, where traumatic in origin

Idiopathic or degenerative medial plantar neuropathy that does not follow an acute injury maps to a different code. S94.10XD is for traumatic injuries, coded during the aftercare phase.

ICD-10-CM coding guidelines for S94.10XD

Correct use of S94.10XD depends on a handful of rules in the ICD-10-CM Official Guidelines. The five below cover the situations that generate most queries on S94 claims.

• Subsequent encounter definition: Section I.C.19 applies D once definitive treatment is finished and the provider is managing healing. No set number of visits triggers the switch from A.
• External cause coding: Code the external cause alongside S94.10XD, such as the fall, the sports event, or the workplace accident. Do this where the record supports it and the payer requires it.
• Code also: If the injury involves other structures at the ankle or foot, code those separately. S94.10XD does not cover fractures, tendon injuries, or skin wounds at the same site.
• No Excludes1 or Excludes2 notes apply directly to S94.10XD, so no automatic exclusion stops it being reported alongside other codes for the same encounter.
• Sequencing: List S94.10XD as the principal diagnosis when it is the reason for the visit. Sequence it secondarily when the encounter treats another condition and the nerve injury is only monitored.

Denials on S94 series claims usually come down to the encounter character rather than a coverage problem. Working through your denial management process for injury codes will show whether that pattern holds in your practice. You can verify code-level detail through the AAPC ICD-10-CM lookup.

Adjacent and related ICD-10 codes

S94.10XD sits in a tidy group of sibling codes. The table below lists the adjacent ones worth knowing. Reach for them when a different nerve is injured at the same site, or when the provider names a leg. The wider ICD-10-CM code library follows the same conventions across every chapter.

What the documentation has to show

Most S94.10XD denials trace back to thin or ambiguous documentation rather than the wrong code. The checklist below covers what the record needs to support this code without a coder query.

• Encounter type clearly stated: the note has to read as a follow-up, aftercare, or continued management visit, not the initial acute presentation
• Laterality documented or explicitly absent: name the affected leg to use the specific code, or record that laterality could not be determined
• Injury mechanism on file: the initial record should say how the injury happened, and later notes can refer back to it
• Treating provider signature: the clinician delivering the aftercare authenticates the note, not only the referring provider
• Diagnosis language: the note should name medial plantar nerve injury, because “foot pain, unspecified” does not support S94.10XD

Practices handling post-surgical foot and ankle cases should build laterality and encounter-type prompts into their intake and progress note templates. A prompt in the template moves the decision to the clinician, where it belongs, instead of leaving it to the coder.

Before the claim goes out, verify insurance eligibility and attach the external cause code that supports medical necessity. Confirm too that the payer accepts codes from the current fiscal year. Many states require provider-authenticated notes within a set timeframe, so check payer and state rules before finalizing.

How Pabau keeps encounter and laterality errors off the claim

In most practices the note lives in one system and the code lookup lives in another. A coder reads the clinician’s note, switches to a lookup tool, finds S94.10XD, then types it into the claim. Each switch is a chance to carry the wrong 7th character across.

Practice management software like Pabau keeps the two together. The diagnosis code is picked inside the client record that already holds the visit, so note and code stay together. Coders can see the encounter type and the documented leg while they choose the code.

Billing runs from that same record. When the claim goes out, the diagnosis, the encounter type, and the payer details all come from the visit the clinician documented. So you get fewer rekeyed codes, and fewer follow-up visits billed as initial encounters.

Keep coding and documentation in one record

Pabau links the clinical note to the diagnosis code and the claim, so encounter type and laterality carry through untouched. See how it works for foot and ankle aftercare.

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Conclusion

An S94.10XD claim rests on three decisions. Is the visit follow-up care? Is the leg genuinely undocumented? And does the note say enough to stand without a payer query?

The first two are quick once you know the rules. The third is where practices lose money, because a note written for the clinician rarely answers what the payer asks. Fix the template and the coding decisions mostly make themselves.

Book a demo to see how Pabau ties the progress note to the diagnosis code for foot and ankle aftercare.

Continue your research

Want to know what a payer checks before it processes a claim? Clean claim standards in medical billing covers the code and documentation elements that get a claim paid first time.

Need to read the remittance after an S94 claim is processed? Electronic remittance advice in medical billing explains 835 files and the denial reason codes that appear on them.

Curious how a clearinghouse validates codes before submission? Medical claims clearinghouse workflow shows where laterality and 7th character errors get caught before the payer sees them.

Coding a different nerve at the same anatomical site? ICD-10 code S94.20XA covers deep peroneal nerve injury at the ankle for an initial encounter.

Frequently asked questions