S66.391D — Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter
Is S66.391D billable?
Yes — S66.391D is billable for FY2027. S66.391D is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. S66.391D may be submitted for encounters from October 1, 2026 through September 30, 2027.
S66.391D at a glance
| Code | S66.391D |
|---|---|
| Description | Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level, subsequent encounter |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "D" | subsequent encounter |
What does the 7th character "D" mean in S66.391D?
In S66.391D, the 7th character D means subsequent encounter. The 7th character is required for S66.391D to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does S66.391D group to?
S66.391D sits in MDC 23 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.
- 949Aftercare with CC/MCCmedical
- 950Aftercare without CC/MCCmedical
How is S66.391D listed in the Alphabetic Index?
The Alphabetic Index lists these routes under S66.39, the nearest indexed parent of S66.391D. Use them to find the family, then select the specific code.
- Injury › muscle › finger › index › extensor › hand level › specified type NEC
- Injury › muscle › finger › little › extensor › hand level › specified type NEC
- Injury › muscle › finger › middle › extensor › hand level › specified type NEC
- Injury › muscle › finger › ring › extensor › hand level › specified type NEC
Use additional code — inherited from Chapter 19
Report an additional code alongside S66.391D to fully describe the condition. S66.391D 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 S66.391D, but a patient may have both at the same time. When documentation supports it, S66.391D and the excluded code may both be reported.
Excludes2 — not included here — inherited from S60-S69
The conditions below are not part of S66.391D, but a patient may have both at the same time. When documentation supports it, S66.391D and the excluded code may both be reported.
Excludes2 — not included here — inherited from S66
The conditions below are not part of S66.391D, but a patient may have both at the same time. When documentation supports it, S66.391D and the excluded code may both be reported.
- sprain of joints and ligaments of wrist and hand (S63.-)
Excludes2 — not included here — inherited from S66.3
The conditions below are not part of S66.391D, but a patient may have both at the same time. When documentation supports it, S66.391D and the excluded code may both be reported.
- Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2-)
Code also — inherited from S66
Two codes may be needed to describe the condition fully. Whether S66.391D is sequenced first depends on the reason for the encounter.
- any associated open wound (S61.-)
How long has S66.391D existed?
S66.391D 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.