2027 ICD-10-CM Diagnosis Code S64.12XSInjury of median nerve at wrist and hand level of left arm, sequela
S64.12XS is a billable ICD-10-CM diagnosis code for injury of median nerve at wrist and hand level of left arm, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S64.12XS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Injuries to the wrist, hand and fingers (S60-S69).
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of nerves at wrist and hand level (S64). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to S64.12XS: its own notes plus those printed at S64, block S60-S69, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code to identify any retained foreign body, if applicable (Z18.-)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
Notes
General instructions on how these codes are used.
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- 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 unspecified body regions as well as poisoning and certain other consequences of external causes.
7th Character
Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.
- The appropriate 7th character is to be added to each code from category S64
- Ainitial encounter
- Dsubsequent encounter
- Ssequela this code
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name S64.12XS, its category, or a range that includes it.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Hand Injuries and Disorders
No matter how old you are or what you do for a living, you are always using your hands. When there is something wrong with them, you may not be able to do your regular activities.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S64.12XS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S64.12XSOverview
What is the ICD-10 code for injury of median nerve at wrist and hand level of left arm, sequela?
The ICD-10-CM code for injury of median nerve at wrist and hand level of left arm, sequela is S64.12XS (sometimes written as S6412XS). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is S64.12XS (Injury of median nerve at wrist and hand level of left arm) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report injury of median nerve at wrist and hand level of left arm, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character S in S64.12XS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the injury of median nerve at wrist and hand level of left arm itself has resolved, not the original event.
What MS-DRG does S64.12XS group to?
When injury of median nerve at wrist and hand level of left arm, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 91, 92, 93, with relative weights from 0.7783 to 1.7050 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S64.12XS exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for injury of median nerve at wrist and hand level of left arm, sequela on inpatient claims. The code appears in the Injuries to the wrist, hand and fingers (S60-S69) range of the CMS exempt list.
