ICD-10-CM › S00-T88 › S60-S69 › S66.4 Injury of intrinsic muscle, fascia... › S66.40
Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
Not billableICD-10-CM diagnosis code.
This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.
Submit one of these 3 more specific codes instead:
- S66.401 Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level (also a header)
- S66.402 Unspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level (also a header)
- S66.409 Unspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level (also a header)
This code requires a seventh character. See the rule below.
What has happened to this code
Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2012 Added to the draft code set draft Unspecified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from S66 Injury of muscle, fascia and tendon at wrist and hand level
Seventh character required
- The appropriate 7th character is to be added to each code from category S66
Excludes2 - not included here
- sprain of joints and ligaments of wrist and hand (S63.-)
Code also
- any associated open wound (S61.-)
Inherited from the S60-S69 section Injuries to the wrist, hand and fingers (S60-S69)
Excludes2 - not included here
- burns and corrosions (T20-T32)
- frostbite (T33-T34)
- insect bite or sting, venomous (T63.4)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Cut > muscle
- Injury > fascia
- Injury > tendon
- Strain > muscle
- Strain > tendon
- Avulsion > muscle
- Avulsion > tendon
- Division > muscle
- Laceration > muscle
- Laceration > tendon
- Tear, torn > muscle
- Tear, torn > tendon
- Injury > leg > muscle
- Injury > thumb > muscle
- Rupture, ruptured > muscle
- Rupture, ruptured > tendon
- Injury > muscle > extensor > finger
- Injury > muscle > intrinsic > thumb
- Injury > muscle > intrinsic > finger
- Rupture, ruptured > muscle > traumatic
- Injury > muscle > leg > posterior muscle group
- Rupture, ruptured > traumatic > muscle or tendon
- Injury > muscle > thumb > intrinsic
Codes in the same group
| Code | Description | Status |
|---|---|---|
| S66.41 | Strain of intrinsic muscle, fascia and tendon of thumb at wrist and hand level | Not billable |
| S66.42 | Laceration of intrinsic muscle, fascia and tendon of thumb at wrist and hand level | Not billable |
| S66.49 | Other specified injury of intrinsic muscle, fascia and tendon of thumb at wrist and hand level | Not billable |