S90.426A — Blister (nonthermal), unspecified lesser toe(s), initial encounter
Is S90.426A billable?
Yes, but S90.426A is an unspecified code. S90.426A is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, S90.426A is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting S90.426A — the more specific alternatives are listed below.
S90.426A at a glance
| Code | S90.426A |
|---|---|
| Description | Blister (nonthermal), unspecified lesser toe(s), initial encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "A" | initial encounter |
What does the 7th character "A" mean in S90.426A?
In S90.426A, the 7th character A means initial encounter. The 7th character is required for S90.426A to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S90.426A group to?
S90.426A sits in MDC 09 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 606Minor Skin Disorders with MCCmedical
- 607Minor Skin Disorders without MCCmedical
How is S90.426A listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S90.42, the nearest indexed parent of S90.426A. Use them to find the family, then select the specific code.
- Blister › toe (nonthermal)
- Blister › toe › great (nonthermal)
Use additional code — inherited from Chapter 19
Report an additional code alongside S90.426A to fully describe the condition. S90.426A is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of S90.426A, but a patient may have both at the same time. When documentation supports it, S90.426A and the excluded code may both be reported.
Excludes2 — not included here — inherited from S90-S99
The conditions below are not part of S90.426A, but a patient may have both at the same time. When documentation supports it, S90.426A and the excluded code may both be reported.
How long has S90.426A existed?
S90.426A has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.