Is ICD-10-CM code S66 billable?

No, S66 (Injury of muscle, fascia and tendon at wrist and hand level) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code S66 belong to?

S66 belongs to Chapter 19 of the ICD-10-CM tabular list: S00–T88 (Injury, Poisoning and Certain Other Consequences of External Causes).

S66Not billable, use a more specific code below

Injury of muscle, fascia and tendon at wrist and hand level

In Injuries to the wrist, hand and fingers (S60-S69), chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes

540 billable codes under S66: 45 are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

Instructional notes

Excludes2: not included here, code separately if applicable

sprain of joints and ligaments of wrist and hand (S63.-)

Code also: add a code for this too, order depends on the encounter

any associated open wound (S61.-)

Also applies, from Injuries to the wrist, hand and fingers (S60-S69)

These notes sit on S60-S69 and apply to every code under it, including S66.

Excludes2: not included here, code separately if applicable

burns and corrosions (T20-T32)
frostbite (T33-T34)
insect bite or sting, venomous (T63.4)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers 7th character use and coding of injuries, fractures, burns, drug and toxic effects, abuse and neglect, and complications of care (S00-T88).

Application of 7th Characters in Chapter 19 (page 77)
Coding of Injuries (page 78)
Coding of Traumatic Fractures (page 79)
Coding of Burns and Corrosions (page 80)
Adverse Effects, Poisoning, Underdosing and Toxic Effects (page 82)
Adult and child abuse, neglect and other maltreatment (page 85)
Complications of care (page 85)

Read Section I.C.19 (page 77)

Codes under S66

S66 can't be used on a claim. Pick a billable code below; grey headings group them.

S66 MS-DRGs

As the principal diagnosis, the billable codes under S66 group to these 14 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 913 Traumatic Injury with MCC (180 of 540 codes)
DRG 914 Traumatic Injury without MCC (180 of 540 codes)
DRG 949 Aftercare with CC/MCC (180 of 540 codes)
DRG 950 Aftercare without CC/MCC (180 of 540 codes)
DRG 963 Other Multiple Significant Trauma with MCC (180 of 540 codes)
DRG 964 Other Multiple Significant Trauma with CC (180 of 540 codes)
DRG 965 Other Multiple Significant Trauma without CC/MCC (180 of 540 codes)
DRG 562 Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC (90 of 540 codes)
DRG 563 Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC (90 of 540 codes)
DRG 564 Other Musculoskeletal System and Connective Tissue Diagnoses with MCC (45 of 540 codes)
DRG 565 Other Musculoskeletal System and Connective Tissue Diagnoses with CC (45 of 540 codes)
DRG 566 Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC (45 of 540 codes)
DRG 604 Trauma to the Skin, Subcutaneous Tissue and Breast with MCC (45 of 540 codes)
DRG 605 Trauma to the Skin, Subcutaneous Tissue and Breast without MCC (45 of 540 codes)

Other codes that refer to S66

Notes on these codes point to S66.

S56 Excludes2: injury of muscle, fascia and tendon at or below wrist (S66.-)
S63 Excludes2: strain of muscle, fascia and tendon of wrist and hand (S66.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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.

Wrist Injuries and Disorders

Your wrist connects your hand to your forearm. It is not one big joint; it has several small joints. This makes it flexible and allows you to move your hand in different ways. The wrist has two big forearm bones and eight small bones known as carpals. It also has tendons and ligaments, which are connective tissues. Tendons connect muscles to bones. Ligaments connect bones to each other.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.