ICD-10 code S60.426S: Right little finger blister sequela

Key takeaways

ICD-10 code S60.426S reports the sequela of a nonthermal blister on the right little finger, and it is billable.

The 7th character S applies only after active treatment of the original blister has ended.

A sequela claim needs two codes. The residual condition is first-listed, and S60.426S follows it.

S60.426 without a 7th character is not billable, so a claim carrying it comes back rejected.

The code is valid for fiscal year 2026, from October 1, 2025 through September 30, 2026.

ICD-10 code S60.426S reports the sequela of a nonthermal blister on the right little finger. The blister itself has healed, and the patient is back for what it left behind. One detail matters more than the rest. S60.426S never travels alone on a claim.

Coders pair it with a second code naming the residual condition, and that second code goes first. Reach for S while the wound is still being dressed, or submit S60.426S on its own, and the claim comes back. What follows covers billable status, the code tree, the 7th-character rules, the companion code, and a pre-submission check.

S60.426S is billable, but only with the S in place

S60.426S is a billable, specific ICD-10-CM code, so it can carry a diagnosis on a submitted claim. It stays valid for HIPAA-covered transactions through fiscal year 2026, which runs from October 1, 2025 to September 30, 2026.

ICD-10-CM changes every October, so check the current tabular list on the CMS ICD-10 codes page at the start of each fiscal year.

Every character in S60.426S narrows the diagnosis one step

Read the code left to right and each character removes options. S60 covers superficial injury of the wrist, hand and fingers. S60.4 narrows that to other superficial injuries of other fingers, S60.42 to nonthermal blisters, and the sixth character to the right little finger.

S60.426 on its own is not billable. Submit it without a 7th character and the claim gets rejected before a reviewer sees it.

The wording of S60.4 is worth a second look too. It says other fingers because the thumb has its own subcategory, S60.3, so a thumb blister sequela is S60.321S or S60.322S.

The CDC/NCHS ICD-10-CM web tool confirms every level of that tree against the tabular list, by fiscal year.

The 7th character tracks the phase of care, not the calendar

The 7th character says where the patient sits in the course of care. It is not a measure of elapsed time.

S60.426 takes three options. A marks the initial encounter, D the subsequent encounter, and S the sequela. They are not interchangeable, and the wrong one misrepresents the visit.

S applies once the blister is considered resolved and a residual condition brings the patient back. Scarring, a contracture, and lasting skin sensitivity all qualify.

One rule catches people out. The S attaches to the injury code only, never to the code for the residual itself. That rule sits in the FY2026 ICD-10-CM Official Guidelines.

Four scenarios that settle A, D, or S in seconds

Match the visit to one of the four situations below and the 7th character picks itself. The phase of care has to match what the provider wrote. A mismatch between the suffix and the note is a familiar audit trigger.

Never assign S60.426S while the blister is still being treated. The sequela phase starts only once the original injury is considered resolved.

The second code a sequela claim cannot do without

A sequela claim carries two diagnosis codes, and S60.426S is the second of them. The first names the residual condition the provider is treating today. S60.426S then sits behind it to identify the injury that produced that residual.

Which code leads depends on what the note documents. Scarring is usually L90.5, lasting altered sensation points to R20.2, and pain in the digit to M79.644. Submit S60.426S on its own and the claim names an injury without naming the condition being treated.

That order matters on the claim form, not only in theory. Payers read the first-listed diagnosis as the reason for the visit. A sequela code in that slot rarely supports medical necessity on its own.

Sibling codes for the other digits, and the unspecified trap

The S60.42 range gives every finger its own code, split by side. That means the digit and the laterality both have to come from the note. Coders should never assume a side.

If the record says little finger with no side named, query the provider before assigning S60.426S. The wider diagnostic code library holds the sibling entries when you need to check one.

Avoid S60.429S when the record names both the digit and the side. Payers deny unspecified codes where the documentation supports a specific one, and this range covers every finger on both hands.

What the provider note has to say

Four elements have to appear in the note before S60.426S is safe to assign. Miss one and the claim is open to a rejection or a documentation query.

• Laterality: the note names the right hand or the right little finger. “Little finger” with no side does not support S60.426S.
• Digit specificity: the note names the affected digit. “Finger blister” routes to an unspecified code until someone clarifies it.
• Phase of care: the note establishes that the blister has resolved and the visit addresses a residual. “Residual scarring from prior right little finger blister” does the job.
• Nonthermal cause: the record ties the blister to friction, pressure, or mechanical contact. Thermal blisters belong in the T20-T32 burn range instead.

Follow one sequela claim from the exam room to the remittance

An S60.426S claim passes through five stages before it pays. Knowing the route tells you where to look when it stops moving.

1. The provider documents the visit, naming the residual condition, the digit, the side, and the fact that the original blister has resolved.
2. The coder assigns the residual condition first and S60.426S second, then pairs both with the CPT code for the service given.
3. The practice scrubs the claim, checking the 7th character against the note and the diagnosis order against payer rules.
4. The clearinghouse validates the format and forwards the claim, or rejects it before the payer ever sees it.
5. The payer adjudicates and returns a remittance advice, which either pays the line or names the reason it did not.

Where these claims usually stall

Three problems account for most of the trouble on this code.

• S used too early. The blister is still being dressed, so that visit belongs to D.
• S60.426S submitted alone. The claim never tells the payer what the provider treated.
• Laterality carried over from a template. The note says little finger, the claim says right, and nobody queried it.

Run these five checks before the claim leaves

A short scrub catches most of the avoidable denials on this code. Work down the list before you release the batch.

• The note names the right side and the little finger, in the provider’s own words.
• The note says the blister has resolved, and describes the residual being treated now.
• The residual condition is coded first, with S60.426S in second position.
• The 7th character reads S, and it appears only on the injury code.
• The CPT code matches the service given at this visit, not the original blister care.

Those five checks are what separates a clean claim from a return-to-provider request on injury sequelae.

How Pabau keeps the note and the claim in step

In most practices these problems surface late. The coder reads a note written days earlier, cannot tell whether the blister has resolved, and sends a query back to the provider. Meanwhile the claim waits.

Practice management software like Pabau moves that check to the point of care. Structured client records capture the side, the digit, and the phase of care while the provider writes. Nobody has to reconstruct the visit afterwards.

From there, cleaner claims management follows each claim through the clearinghouse and back. You can see which sequela lines paid and which came back, without opening a separate portal.

Keep sequela codes and documentation aligned

Pabau captures laterality and phase of care in the client record, then tracks each claim from submission to remittance. That means fewer coder queries and fewer returned injury claims.

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Conclusion

S60.426S is a narrow code, and that is what makes it easy to get wrong. The digit, the side, and the phase of care all have to come from the note. Then the residual condition has to lead the claim, with S60.426S behind it.

Fix the documentation and the coding follows. Ask providers to state the phase of care in plain words, and most of the guesswork on this range disappears.

Practices handling injury follow-ups at volume gain more from tightening the note than from appealing denials one at a time. Book a demo to see how Pabau captures phase of care at the visit and tracks the claim that follows.

Continue your research

Coding a wrist injury with the same 7th character? ICD-10 code S60.219S applies the sequela rules to a contusion of the unspecified wrist.

Same finger, a different injury? ICD-10 code S60.152S covers a contusion of the left little finger with nail damage, sequela.

Managing claim rejections across injury code encounters? Denial management in healthcare covers the most common denial triggers and how to resolve them systematically.

Looking for a structured overview of medical billing fundamentals? Revenue cycle management explained breaks down how each billing step connects to claim payment.

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