2027 ICD-10-CM Diagnosis Code S66.902SUnspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela
S66.902S is a billable ICD-10-CM diagnosis code for unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, 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 913 through 914. The code is exempt from POA reporting. Coders also document this condition as injury of muscle of left hand. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
S66.902S 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).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Injury of muscle of left hand
- Injury of tendon of left hand
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of muscle, fascia and tendon at wrist and hand level (S66). 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 S66.902S: its own notes plus those printed at S66, 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.
- sprain of joints and ligaments of wrist and hand (S63.-)
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 S66
- 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 S66.902S, its category, or a range that includes it.
Excludes2 2
These codes carry an Excludes2 note naming S66.902S: its condition is not part of those codes, and both may be reported when the patient has both.
- S56 Injury of muscle, fascia and tendon at forearm levelinjury of muscle, fascia and tendon at or below wrist (S66.-) names S66.-, which includes this code
- S63 Dislocation and sprain of joints and ligaments at wrist and hand levelstrain of muscle, fascia and tendon of wrist and hand (S66.-) names S66.-, which includes this code
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 S66.902S to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S66.902SOverview
Is S66.902S a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What does the 7th character S in S66.902S mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand itself has resolved, not the original event.
What MS-DRG does S66.902S group to?
When unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 914, 913, with relative weights from 0.9281 to 1.5448 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S66.902S 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 unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela on inpatient claims. The code appears in the Injuries to the wrist, hand and fingers (S60-S69) range of the CMS exempt list.
What is the ICD-9 equivalent of S66.902S?
Under the General Equivalence Mappings, unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand, sequela converts to ICD-9-CM 908.9 (late effect injury NOS). The mapping is approximate, so confirm the match fits the documentation.
